CN110855292A - Digital-to-analog conversion device - Google Patents
Digital-to-analog conversion device Download PDFInfo
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- CN110855292A CN110855292A CN201911337850.XA CN201911337850A CN110855292A CN 110855292 A CN110855292 A CN 110855292A CN 201911337850 A CN201911337850 A CN 201911337850A CN 110855292 A CN110855292 A CN 110855292A
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- 239000003990 capacitor Substances 0.000 claims abstract description 271
- 239000011324 bead Substances 0.000 claims description 9
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Abstract
The embodiment of the invention discloses a digital-to-analog conversion device. The device includes: the first voltage input end is connected with one end of the first resistor; the other end of the second resistor is connected with one end of the third resistor and the inverting input pin of the channel A of the amplifier; the other end of the third resistor is connected with the first capacitor, one end of the fourth resistor, the cathode of the first diode and the pin A of the output channel of the amplifier; a channel A of the amplifier is connected with a non-inverting input pin of the fifth resistor and one end of a sixth resistor; an output channel B pin of the amplifier is connected with the eighth resistor, the third capacitor, the cathode of the second diode and one end of the ninth resistor; the other end of the eighth resistor is connected with one end of the tenth resistor and the inverting input pin of the channel B of the amplifier; and a channel B non-inverting input pin of the amplifier is connected with one end of the twelfth resistor and one end of the thirteenth resistor. By applying the scheme provided by the embodiment of the invention, the torque measured value can be accurately transmitted between the single chip microcomputer and other equipment.
Description
Technical Field
The invention relates to the technical field of torque measurement, in particular to a digital-to-analog conversion device.
Background
With the development of the domestic automobile industry, new models come to the fore, and automobile bench and road tests become more and more important. Modern engines need to increase the rotating speed to improve the mechanical performance and efficiency, and the torque is an important index of the performance of the motor and the engine, so that high-precision and high-reliability torque measurement is needed. And the measured data needs to be transmitted to a display device for displaying.
The torque measured value collected by the torque collecting device is a digital signal after passing through the single chip microcomputer in the transmission process, and only an analog signal can be transmitted when the torque measured value is transmitted to other devices from the single chip microcomputer. Therefore, in order to solve the problem of accurate transmission of torque measurement, a digital-to-analog conversion device is needed.
Disclosure of Invention
The invention provides a digital-to-analog conversion device which is used for carrying out digital-to-analog conversion on a torque measured value and ensuring the torque measured value to be accurately transmitted between a single chip microcomputer and other equipment. The specific technical scheme is as follows.
In a first aspect, an embodiment of the present invention provides a digital-to-analog conversion apparatus, including:
the first voltage input end is connected with one end of the first resistor; the other end of the first resistor is connected with one end of the second resistor;
the other end of the second resistor is connected with one end of a third resistor and an inverting input pin of a channel A of the amplifier; the other end of the third resistor is connected with the first capacitor, one end of the fourth resistor, the cathode of the first diode and the pin A of the output channel of the amplifier;
the other end of the first capacitor is grounded; the anode of the first diode is grounded;
a channel A of the amplifier is connected with a non-inverting input pin of the amplifier and one end of a fifth resistor and one end of a sixth resistor; the other end of the fifth resistor is grounded; the other end of the sixth resistor is connected with one end of the seventh resistor; the other end of the seventh resistor is connected with one end of the second capacitor; the other end of the second capacitor is grounded;
an output channel B pin of the amplifier is connected with an eighth resistor, a third capacitor, a cathode of a second diode and one end of a ninth resistor;
the other end of the eighth resistor is connected with one end of a tenth resistor and an inverting input pin of a channel B of the amplifier; the other end of the tenth resistor is connected with one end of the eleventh resistor; the other end of the eleventh resistor is connected with the first voltage input end; the other end of the third capacitor is grounded; the anode of the second diode is grounded;
a channel B non-inverting input pin of the amplifier is connected with one end of a twelfth resistor and one end of a thirteenth resistor; the other end of the twelfth resistor is grounded; the other end of the thirteenth resistor is connected with one end of the fourteenth resistor; the other end of the fourteenth resistor is connected with one end of a fourth capacitor; the other end of the fourth capacitor is grounded;
the negative power supply voltage pin of the amplifier is connected with the second voltage input end; and the positive power supply voltage pin of the amplifier is connected with the third voltage input end.
Optionally, the method further includes:
a first voltage conversion device, a second voltage conversion device, a third voltage conversion device, and a fourth voltage conversion device;
a first voltage output end of the first voltage conversion device is connected with a fourth voltage input end of the second voltage conversion device; a second voltage output end of the second voltage conversion device is connected with a fifth voltage input end of the third voltage conversion device; the first voltage output end of the first voltage conversion device is also connected with the sixth voltage input end of the fourth voltage conversion device; a third voltage output end of the third voltage conversion device is connected with the first voltage input end; a fourth voltage output end of the fourth voltage conversion device is connected with the second voltage input end; a fifth voltage output end of the fourth voltage conversion device is connected with the third voltage input end;
the seventh voltage input end voltage of the first voltage conversion device is 12 volts, the first voltage output end voltage is 5.4 volts, the second voltage output end voltage is 3.3 volts, the third voltage output end voltage is 1.6 volts, and the fourth voltage output end voltage and the fifth voltage output end voltage are both 5.1 volts.
Optionally, the first voltage conversion device includes:
the seventh voltage input end is connected with the fifth capacitor, one end of the fifteenth resistor and a voltage input pin of the switching regulator;
the other end of the fifth capacitor is grounded; the other end of the fifteenth resistor is connected with an enabling input pin and a disabling input pin of the switching regulator; the ground pin of the switching regulator is grounded;
a bootstrap voltage pin of the switching regulator is connected with one end of a sixth capacitor; the other end of the sixth capacitor is connected with a switch node pin of the switching regulator, one end of the first inductor and the negative electrode of the third diode;
the anode of the third diode is grounded; the other end of the first inductor is connected with one end of a sixteenth resistor, one end of a seventh capacitor, one end of an eighth capacitor, one end of a ninth capacitor and the first voltage output end;
the other end of the sixteenth resistor is connected with one end of the seventeenth resistor and a feedback pin of the switching regulator; the other end of the seventeenth resistor is grounded;
and the other ends of the seventh capacitor, the eighth capacitor and the ninth capacitor are all grounded.
Optionally, the fifth capacitance is 4.7 microfarads; the sixth capacitor is 100 nanofarads; the seventh capacitor is 10 microfarads; the eighth capacitor is 10 microfarads; the ninth capacitor is 100 nanofarads;
the fifteenth resistance is 100 kilo-ohms; the sixteenth resistance is 63.4 kilo-ohms; the seventeenth resistance is 10.7 kilo-ohms;
the first inductance is 33 microhenries; the third diode is MBR0520LT 1G.
Optionally, the second voltage conversion device includes:
the fourth voltage input end is connected with the tenth capacitor, one end of the eleventh capacitor, and a first voltage input pin and a second voltage input pin of the voltage stabilizer;
the other ends of the tenth capacitor and the eleventh capacitor are grounded; the ground pin of the voltage stabilizer is grounded;
an output voltage pin of the voltage stabilizer is connected with the twelfth capacitor, the thirteenth capacitor, the fourteenth capacitor and one end of the magnetic bead;
the other ends of the twelfth capacitor, the thirteenth capacitor and the fourteenth capacitor are all grounded; and the other end of the magnetic bead is connected with the second voltage output end.
Optionally, the tenth capacitance is 1 microfarad; the eleventh capacitance is 100 nanofarads; the twelfth capacitor is 1 microfarad; the thirteenth capacitor is 100 nanofarads; the fourteenth capacitance is 100 picofarads; the magnetic beads are 0 ohm.
Optionally, the third voltage conversion device includes:
the fifth voltage input end is connected with one end of the fifteenth capacitor, one end of the sixteenth capacitor and a power supply voltage input pin of the voltage conversion chip;
the other ends of the fifteenth capacitor and the sixteenth capacitor are grounded; the ground pin of the voltage conversion chip is grounded;
a reference voltage output pin of the voltage conversion chip is connected with one end of a seventeenth capacitor, an eighteenth capacitor and a second inductor;
the other ends of the seventeenth capacitor and the eighteenth capacitor are grounded; the other end of the second inductor is connected with the nineteenth capacitor and the third voltage output end;
the other end of the nineteenth capacitor is grounded;
the fifteenth capacitor is 4.7 microfarads, the sixteenth capacitor is 100 nanofarads, the seventeenth capacitor is 1 microfarads, and the eighteenth capacitor is 100 nanofarads; the nineteenth capacitor is 100 nanofarads; the second inductance is 10 microhenries.
Optionally, the fourth voltage conversion device includes:
the sixth voltage input end is connected with one end of the twentieth capacitor, one end of the twenty-first capacitor, an input voltage pin of the output power supply, the first logic input pin and the second logic input pin; the other end of the twentieth capacitor is grounded; the other end of the twenty-first capacitor is grounded and is connected with the mode pin of the output power supply;
the suspension capacitor of the output power supply is positively connected with a pin and is connected with one end of a twenty-second capacitor; the other end of the twenty-second capacitor is connected with a negative connecting pin of the suspension capacitor of the output power supply;
an output voltage pin of the output power supply is connected with one end of a twenty-third capacitor and one end of a twenty-fourth capacitor; the other ends of the twenty-third capacitor and the twenty-fourth capacitor are grounded;
the input connection pin of the input power supply is connected with one end of a nineteenth resistor; the other end of the nineteenth resistor is grounded;
the positive low-voltage difference output pin of the input power supply is connected with one end of a twenty-fifth capacitor, one end of a twenty-sixth capacitor, one end of a twentieth resistor and the fourth voltage output end; the other ends of the twenty-fifth capacitor and the twenty-sixth capacitor are grounded;
the other end of the twentieth resistor is connected with one end of the twenty-first resistor and a feedback input pin of the positive low dropout regulator of the input power supply; the other end of the twenty-first resistor is connected with one end of a twenty-seventh capacitor, one end of a twenty-eighth capacitor, one end of a twenty-second resistor and a ground pin of the input power supply;
the other end of the twenty-seventh capacitor is connected with a positive reference bypass pin of the input power supply; the other end of the twenty-eighth capacitor is connected with a negative reference bypass pin of the input power supply; the other end of the twenty-second resistor is connected with one end of a twenty-third resistor and a feedback input pin of the negative low dropout regulator of the input power supply;
the other end of the twenty-third resistor is connected with the twenty-ninth capacitor, one end of the thirty-fifth capacitor, the negative low-voltage-difference output pin of the input power supply and the fifth voltage output end; and the other ends of the twenty-ninth capacitor and the thirty-eighth capacitor are grounded.
Optionally, the twentieth capacitance is 10 microfarads; the twenty-first capacitance is 100 nanofarads; the twenty-second capacitance is 1 microfarad; the twenty-third capacitance is 10 microfarads; the twenty-fourth capacitance is 100 nanofarads; the twenty-fifth capacitor is 10 microfarads; the twenty-sixth capacitance is 100 nanofarads; the twenty-seventh capacitor is 10 nanofarads; the twenty-eighth capacitor is 10 nanofarads; the twenty-ninth capacitor is 10 microfarads; the thirtieth capacitor is 100 nanofarads;
the nineteenth resistor is 200 kilo-ohms; the twentieth resistance is 330 kilo-ohms; the twenty-first resistance is 100 kilo-ohms; the twenty-second resistance is 100 kilo-ohms; the twenty-third resistance is 330 kilo-ohms.
Optionally, the first resistance is 10.2 kilo-ohms; the second resistance is 360 ohms; the third resistance is 33 kilo-ohms; the fifth resistance is 33 kilo-ohms; the sixth resistor is 360 ohms; the seventh resistance is 10.2 kilo-ohms; the eighth resistance is 33 kilo-ohms; the tenth resistance is 10.2 kilo-ohms; the eleventh resistance is 360 ohms; the twelfth resistance is 33 kilo-ohms; the thirteenth resistance is 10.2 kilo-ohms; the fourteenth resistance is 360 ohms;
the first capacitance is 10 nanofarads; the second capacitor is 10 nanofarads; the third capacitor is 10 nanofarads; the fourth capacitance is 10 nanofarads.
As can be seen from the above, the digital-to-analog conversion apparatus provided in the embodiment of the present invention may include: the first voltage input end is connected with one end of the first resistor; the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is connected with one end of the third resistor and the inverting input pin of the channel A of the amplifier; the other end of the third resistor is connected with the first capacitor, one end of the fourth resistor, the cathode of the first diode and the pin A of the output channel of the amplifier; the other end of the first capacitor is grounded; the anode of the first diode is grounded; a channel A of the amplifier is connected with a non-inverting input pin of the fifth resistor and one end of a sixth resistor; the other end of the fifth resistor is grounded; the other end of the sixth resistor is connected with one end of the seventh resistor; the other end of the seventh resistor is connected with one end of the second capacitor; the other end of the second capacitor is grounded; an output channel B pin of the amplifier is connected with the eighth resistor, the third capacitor, the cathode of the second diode and one end of the ninth resistor; the other end of the eighth resistor is connected with one end of the tenth resistor and the inverting input pin of the channel B of the amplifier; the other end of the tenth resistor is connected with one end of the eleventh resistor; the other end of the eleventh resistor is connected with the first voltage input end; the other end of the third capacitor is grounded; the anode of the second diode is grounded; a channel B non-inverting input pin of the amplifier is connected with one end of the twelfth resistor and one end of the thirteenth resistor; the other end of the twelfth resistor is grounded; the other end of the thirteenth resistor is connected with one end of the fourteenth resistor; the other end of the fourteenth resistor is connected with one end of the fourth capacitor; the other end of the fourth capacitor is grounded; a negative supply voltage pin of the amplifier is connected with the second voltage input end; the positive power supply voltage pin of the amplifier is connected with the third voltage input end, so that the torque measured value can be converted from a digital signal to an analog signal based on the analog-to-digital converter, and the torque measured value can be accurately transmitted between the single chip microcomputer and other equipment. Of course, not all of the advantages described above need to be achieved at the same time in the practice of any one product or method of the invention.
The innovation points of the embodiment of the invention comprise:
1. the torque measurement value is converted from a digital signal to an analog signal based on the analog-to-digital converter, so that the torque measurement value can be accurately transmitted between the single chip microcomputer and other equipment.
2. The voltage value suitable for the digital-to-analog conversion device to work can be obtained through conversion of the voltage conversion device, and normal work of the digital-to-analog conversion device is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is to be understood that the drawings in the following description are merely exemplary of some embodiments of the invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.
FIG. 1 is a schematic diagram of a digital-to-analog conversion apparatus according to the present invention;
FIG. 2 is a schematic structural diagram of a voltage conversion device according to the present invention;
FIG. 3 is a schematic structural diagram of another voltage conversion device according to the present invention;
FIG. 4 is a schematic structural diagram of another voltage conversion device according to the present invention;
fig. 5 is a schematic structural diagram of another voltage conversion device according to the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
It is to be noted that the terms "comprises" and "comprising" and any variations thereof in the embodiments and drawings of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a digital-to-analog conversion device which can convert a torque measured value from a digital signal to an analog signal, thereby ensuring the accurate transmission of the torque measured value between a single chip microcomputer and other equipment. The following provides a detailed description of embodiments of the invention.
Fig. 1 is a schematic structural diagram of a digital-to-analog conversion apparatus according to an embodiment of the present invention. The digital-to-analog conversion apparatus includes:
the first voltage input end is connected with one end of a first resistor R55; the other end of the first resistor R55 is connected with one end of the second resistor R56;
a second resistor R56, the other end of which is connected with one end of the third resistor R1 and a pin 2 of the amplifier, namely-INA (channel A inverting input) pin; a third resistor R1, the other end of which is connected to the first capacitor C1, one end of the fourth resistor R7, the cathode of the first diode D2, and pin 1 of the amplifier, i.e., OUTA (output channel a) pin;
a first capacitor C1, the other end of which is grounded; a first diode D2, the anode of which is grounded;
an eighth resistor R49, the other end of which is connected to one end of the tenth resistor R48 and to pin 6 of the amplifier, i.e., the-INB (channel B inverting input) pin; a tenth resistor R48, the other end of which is connected with one end of an eleventh resistor R47; an eleventh resistor R47, the other end of which is connected to the first voltage input terminal; a third capacitor C15, the other end of which is grounded; the anode of the second diode D13 is grounded;
The amplifier may be ADA4522-2 ARZ. ADA4522-2ARZ is a dual channel, zero drift operational amplifier with ground sense input and rail-to-rail output optimized for overall accuracy over time, temperature and voltage conditions. The wide operating voltage and temperature range, together with high open loop gain and extremely low dc and ac errors make the device well suited for amplifying very small input signals and accurately reproducing larger signals in a variety of applications.
The performance of ADA4522-2ARZ was specified as 5.0V, 30V and 55V supply voltages. These devices operate in the voltage range of 4.5V to 55V, and are well suited for use with 5V, 10V, 12V and 30V single-ended power supplies, or with higher single power supplies and dual power supplies of ± 2.5V. The ADA4522-2ARZ adopts an on-chip filtering technology, and can realize high immunity to electromagnetic interference. The nominal operating temperature range of ADA4522-2ARZ is an extended industrial temperature range from-40 ℃ to +125 ℃. An 8 pin MSOP, 8 pin SOIC, 14 pin SOIC and 14 pin TSSOP package is used.
The first resistor R55 is 10.2 kohm; the second resistor R56 is 360 ohms; the third resistor R1 is 33 kilo-ohms; the fifth resistor R8 is 33 kilo-ohms; the sixth resistor R58 is 360 ohms; the seventh resistor R57 is 10.2 kilo-ohms; the eighth resistor R49 is 33 kilo-ohms; the tenth resistor R48 is 10.2 kilo-ohms; the eleventh resistor R47 is 360 ohms; the twelfth resistor R50 is 33 kilo-ohms; the thirteenth resistor R59 is 10.2 kohms; the fourteenth resistor R60 is 360 ohms. The first resistor R55, the second resistor R56, the seventh resistor R57 and the sixth resistor R58 function to amplify and follow.
The first capacitor C1 is 10 nanofarads; the second capacitor C13 is 10 nanofarads; the third capacitor C15 is 10 nanofarads; the fourth capacitor C14 is 10 nanofarads. The first diode D2 functions as an antistatic.
As can be seen from the above, the digital-to-analog conversion apparatus provided in the embodiment of the present invention may include: the first voltage input end is connected with one end of the first resistor; the other end of the first resistor is connected with one end of the second resistor; the other end of the second resistor is connected with one end of the third resistor and the inverting input pin of the channel A of the amplifier; the other end of the third resistor is connected with the first capacitor, one end of the fourth resistor, the cathode of the first diode and the pin A of the output channel of the amplifier; the other end of the first capacitor is grounded; the anode of the first diode is grounded; a channel A of the amplifier is connected with a non-inverting input pin of the fifth resistor and one end of a sixth resistor; the other end of the fifth resistor is grounded; the other end of the sixth resistor is connected with one end of the seventh resistor; the other end of the seventh resistor is connected with one end of the second capacitor; the other end of the second capacitor is grounded; an output channel B pin of the amplifier is connected with the eighth resistor, the third capacitor, the cathode of the second diode and one end of the ninth resistor; the other end of the eighth resistor is connected with one end of the tenth resistor and the inverting input pin of the channel B of the amplifier; the other end of the tenth resistor is connected with one end of the eleventh resistor; the other end of the eleventh resistor is connected with the first voltage input end; the other end of the third capacitor is grounded; the anode of the second diode is grounded; a channel B non-inverting input pin of the amplifier is connected with one end of the twelfth resistor and one end of the thirteenth resistor; the other end of the twelfth resistor is grounded; the other end of the thirteenth resistor is connected with one end of the fourteenth resistor; the other end of the fourteenth resistor is connected with one end of the fourth capacitor; the other end of the fourth capacitor is grounded; a negative supply voltage pin of the amplifier is connected with the second voltage input end; the positive power supply voltage pin of the amplifier is connected with the third voltage input end, so that the torque measured value can be converted from a digital signal to an analog signal based on the analog-to-digital converter, and the torque measured value can be accurately transmitted between the single chip microcomputer and other equipment.
As an implementation manner of the embodiment of the present invention, the digital-to-analog conversion apparatus may further include: a first voltage conversion device, a second voltage conversion device, a third voltage conversion device, and a fourth voltage conversion device.
A first voltage output end of the first voltage conversion device is connected with a fourth voltage input end of the second voltage conversion device; a second voltage output end of the second voltage conversion device is connected with a fifth voltage input end of the third voltage conversion device; the first voltage output end of the first voltage conversion device is also connected with the sixth voltage input end of the fourth voltage conversion device; a third voltage output end of the third voltage conversion device is connected with the first voltage input end; a fourth voltage output end of the fourth voltage conversion device is connected with the second voltage input end; and a fifth voltage output end of the fourth voltage conversion device is connected with the third voltage input end.
The seventh voltage input end voltage of the first voltage conversion device is 12 volts, the first voltage output end voltage is 5.4 volts, the second voltage output end voltage is 3.3 volts, the third voltage output end voltage is 1.6 volts, and the fourth voltage output end voltage and the fifth voltage output end voltage are both 5.1 volts.
In one implementation, as shown in fig. 2, a first voltage conversion device includes:
a seventh Voltage Input end, connected to the fifth capacitor C17, one end of the fifteenth resistor R65, and a pin 5 of the switching regulator, i.e., a VIN (Voltage Input) pin;
a fifth capacitor C17, the other end of which is grounded; a fifteenth resistor R65, the other end of which is connected to pin 4 of the switching regulator, i.e., SHDN _ N (enable and disable input) pin; pin 2 of the switching regulator, namely, a GND (Ground) pin, is grounded;
the anode of the third diode D14 is grounded; the other end of the first inductor L1 is connected with a sixteenth resistor R51, a seventh capacitor C18, an eighth capacitor C19, one end of a ninth capacitor C20 and a first voltage output end;
a sixteenth resistor R51, the other end of which is connected to one end of the seventeenth resistor R52 and to pin 3 of the switching regulator, i.e., FB (feedback) pin; a seventeenth resistor R52, the other end of which is grounded;
the other ends of the seventh capacitor C18, the eighth capacitor C19 and the ninth capacitor C20 are all grounded.
The switching regulator may be LMR16006 XDDCR. In the voltage conversion device, 12V voltage is converted into 5.4V voltage by a switching regulator. The LMR16006XDDCR chip has wide working input voltage of 1.4V to 36V, the output voltage of 2.5V to 15V can be adjusted, and the output current can reach 600 mA.
The fifth capacitor C17 is 4.7 microfarads; the sixth capacitor C16 is 100 nanofarads; the seventh capacitor C18 is 10 microfarads; the eighth capacitor C19 is 10 microfarads; the ninth capacitor C20 is 100 nanofarads. The function of each capacitor is filtering. The fifth capacitor C17, the seventh capacitor C18 and the eighth capacitor C19 also have the function of energy storage.
The fifteenth resistor R65 is 100 kilo-ohms; a sixteenth resistor R51 of 63.4 kilo-ohms; the seventeenth resistor R52 is 10.7 kilo-ohms. The sixteenth resistor R51 and the seventeenth resistor R52 function to regulate the output voltage.
The first inductance L1 is 33 microhenries; its function is to store energy. The third diode D14 is MBR0520LT1G, which functions as an anti-reverse.
In one implementation, as shown in fig. 3, the second voltage conversion device includes:
a fourth voltage input terminal connected to the tenth capacitor C22, one end of the eleventh capacitor C23, and pin 2 and pin 4 of the regulator, i.e., the Vin (voltage input) pin;
the other ends of the tenth capacitor C22 and the eleventh capacitor C23 are grounded; pin 1 of the voltage regulator, namely, a GND (Ground) pin is grounded;
the twelfth capacitor C24, the thirteenth capacitor C25 and the fourteenth capacitor C21 are all grounded at the other end; and the other end of the magnetic bead R12 is connected with a second voltage output end.
The tenth capacitor C22 is 1 microfarad; the eleventh capacitor C23 is 100 nanofarads; the twelfth capacitor C24 is 1 microfarad; the thirteenth capacitor C25 is 100 nanofarads; the fourteenth capacitor C21 is 100 picofarads; the magnetic bead R12 was 0 ohms. The functions of each capacitor and each resistor are filtering. The tenth capacitor C22 and the twelfth capacitor C24 also have the function of energy storage.
In one implementation, as shown in fig. 4, the third voltage conversion device includes:
a fifth voltage input terminal, which is connected to the fifteenth capacitor C32, one end of the sixteenth capacitor C31, and pin 1 of the voltage conversion chip, i.e., the IN (power supply voltage input) pin;
the other ends of the fifteenth capacitor C32 and the sixteenth capacitor C31 are grounded; pin 3 of the voltage conversion chip, namely a GND (Ground) pin, is grounded;
the seventeenth capacitor C55 and the eighteenth capacitor C33 are grounded at the other ends; the other end of the second inductor L2 is connected with the nineteenth capacitor C54 and a third voltage output end; a nineteenth capacitor C54, the other terminal being connected to ground.
The fifteenth capacitor C32 is 4.7 microfarads, the sixteenth capacitor C31 is 100 nanofarads, the seventeenth capacitor C55 is 1 microfarad, and the eighteenth capacitor C33 is 100 nanofarads; the nineteenth capacitor C54 is 100 nanofarads; the second inductance L2 is 10 microhenries.
In one implementation, as shown in fig. 5, the fourth voltage conversion apparatus includes:
a sixth Voltage Input end, connected to one end of the twentieth capacitor C4, one end of the twenty-first capacitor C7, and a pin 11 of the output power supply, i.e., a VIN (Voltage Input) pin, where pin 1 is connected to a pin 13, i.e., an EN + pin and an EN- (logic Input) pin; a twentieth capacitor C4, the other end of which is grounded; a twenty-first capacitor C7, the other end of which is grounded and connected to pin 14 of the output power supply, i.e. the MODE pin;
a pin 10 of the output power supply, namely a pin C + (the suspension capacitor is positively connected) is connected with one end of a twenty-second capacitor C6; a twenty-second capacitor C6, the other end of which is connected with pin 7 of the output power supply, i.e. the pin of C- (negative connection of floating capacitor);
a pin 12 for inputting a power supply, namely an LDO + (positive low dropout output) pin, is connected with one end of a twenty-fifth capacitor C3, one end of a twenty-sixth capacitor C2, one end of a twentieth resistor R3 and a fourth voltage output end; the other ends of the twenty-fifth capacitor C3 and the twenty-sixth capacitor C2 are grounded;
the other end of the twentieth resistor R3 is connected with one end of the twenty-first resistor R4 and a pin 15 of an input power supply, namely an ADJ + (feedback input of the positive low dropout regulator); a twenty-first resistor R4, the other end of which is connected to one end of a twenty-seventh capacitor C5, a twenty-eighth capacitor C11, a twenty-second resistor R5, and a pin 17 of an input power, namely a GND (Ground) pin;
a twenty-seventh capacitor C5, the other end of which is connected to pin 16 of the input power supply, i.e., the BYP + (positive reference bypass) pin; a twenty-eighth capacitor C11, the other end of which is connected to pin 3 of the input power supply, i.e., the BYP- (negative reference bypass) pin; the other end of the twenty-second resistor R5 is connected with one end of a twenty-third resistor R6 and a pin 4 of an input power supply, namely an ADJ- (feedback input of the negative low dropout regulator);
a twenty-third resistor R6, the other end of which is connected to one end of a twenty-ninth capacitor C8, one end of a thirty-third capacitor C9, a pin 5 of an input power supply, i.e., a LDO- (negative low dropout output) pin, and a fifth voltage output terminal; a twenty-ninth capacitor C8, a thirty-eighth capacitor C9, and the other end of the capacitor is grounded.
The input power source can be LTC 3260. LTC3260 is a low noise bipolar output power supply. The input voltage range is 4.5V-32V, and the current of 100mA can be output. The charge pump operates in a low quiescent current burst mode or a low noise constant frequency mode.
The logic "high" on the EN + pin in LTC3260 enables the positive low dropout (LDO +) regulator. The RT pin is used for input connection for programming the switching frequency. When the EN-pin is driven to logic "high", the RT pin will be fixed at 1.2V. If the RT pin is connected to GND, the switching frequency defaults to a fixed 500 kHz. The LDO-pin connects the BYP capacitor to GND to reduce LDO-output noise, and remains floating if not used. The LDO-pin requires a low ESR (Equivalent series resistance) capacitor with a capacitance to ground of at least 2 microfarads to ensure stability. The logic "high" on the EN-pin enables the inverting charge pump and the negative LDO regulator.
The twentieth capacitor C4 is 10 microfarads; the twenty-first capacitor C7 is 100 nanofarads; the twenty-second capacitor C6 is 1 microfarad; the twenty-third capacitor C10 is 10 microfarads; the twenty-fourth capacitor C12 is 100 nanofarads; the twenty-fifth capacitor C3 is 10 microfarads; the twenty-sixth capacitor C2 is 100 nanofarads; the twenty-seventh capacitor C5 is 10 nanofarads; the twenty-eighth capacitor C11 is 10 nanofarads; a twenty-ninth capacitor C8 of 10 microfarads; the thirtieth capacitor C9 is 100 nanofarads.
The nineteenth resistor R54 is 200 kilo-ohms; the twentieth resistor R3 is 330 kilo-ohms; the twenty-first resistor R4 is 100 kilo-ohms; the twenty-second resistor R5 is 100 kilo-ohms; the twenty-third resistor R6 is 330 kilo-ohms.
The voltage value suitable for the digital-to-analog conversion device to work can be obtained through conversion of the voltage conversion device, and normal work of the digital-to-analog conversion device is guaranteed.
Those of ordinary skill in the art will understand that: the figures are merely schematic representations of one embodiment, and the blocks or flow diagrams in the figures are not necessarily required to practice the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A digital-to-analog conversion apparatus, comprising:
a first voltage input terminal connected to one end of a first resistor (R55); the other end of the first resistor (R55) is connected with one end of a second resistor (R56);
the other end of the second resistor (R56) is connected with one end of a third resistor (R1) and the inverting input pin of the channel A of the amplifier; the other end of the third resistor (R1) is connected with the first capacitor (C1), one end of the fourth resistor (R7), the cathode of the first diode (D2) and the pin A of the output channel of the amplifier;
the other end of the first capacitor (C1) is grounded; the first diode (D2), the positive pole is grounded;
the non-inverting input pin of the channel A of the amplifier is connected with one end of a fifth resistor (R8) and one end of a sixth resistor (R58); the other end of the fifth resistor (R8) is grounded; the other end of the sixth resistor (R58) is connected with one end of a seventh resistor (R57); the other end of the seventh resistor (R57) is connected with one end of the second capacitor (C13); the other end of the second capacitor (C13) is grounded;
an output channel B pin of the amplifier is connected with an eighth resistor (R49), a third capacitor (C15), the cathode of a second diode (D13) and one end of a ninth resistor (R2);
the other end of the eighth resistor (R49) is connected with one end of a tenth resistor (R48) and the inverting input pin of the channel B of the amplifier; the other end of the tenth resistor (R48) is connected with one end of an eleventh resistor (R47); the other end of the eleventh resistor (R47) is connected with the first voltage input end; the other end of the third capacitor (C15) is grounded; the anode of the second diode (D13) is grounded;
a channel B non-inverting input pin of the amplifier is connected with one end of a twelfth resistor (R50) and one end of a thirteenth resistor (R59); the twelfth resistor (R50) has the other end grounded; the other end of the thirteenth resistor (R59) is connected with one end of a fourteenth resistor (R60); the other end of the fourteenth resistor (R60) is connected with one end of a fourth capacitor (C14); the other end of the fourth capacitor (C14) is grounded;
the negative power supply voltage pin of the amplifier is connected with the second voltage input end; and the positive power supply voltage pin of the amplifier is connected with the third voltage input end.
2. The digital-to-analog conversion apparatus according to claim 1, further comprising:
a first voltage conversion device, a second voltage conversion device, a third voltage conversion device, and a fourth voltage conversion device;
a first voltage output end of the first voltage conversion device is connected with a fourth voltage input end of the second voltage conversion device; a second voltage output end of the second voltage conversion device is connected with a fifth voltage input end of the third voltage conversion device; the first voltage output end of the first voltage conversion device is also connected with the sixth voltage input end of the fourth voltage conversion device; a third voltage output end of the third voltage conversion device is connected with the first voltage input end; a fourth voltage output end of the fourth voltage conversion device is connected with the second voltage input end; a fifth voltage output end of the fourth voltage conversion device is connected with the third voltage input end;
the seventh voltage input end voltage of the first voltage conversion device is 12 volts, the first voltage output end voltage is 5.4 volts, the second voltage output end voltage is 3.3 volts, the third voltage output end voltage is 1.6 volts, and the fourth voltage output end voltage and the fifth voltage output end voltage are both 5.1 volts.
3. The digital-to-analog conversion apparatus according to claim 2, wherein the first voltage conversion apparatus comprises:
the seventh voltage input end is connected with a fifth capacitor (C17), one end of a fifteenth resistor (R65) and a voltage input pin of the switching regulator;
the other end of the fifth capacitor (C17) is grounded; the fifteenth resistor (R65), the other end is connected with the enabling and disabling input pin of the switching regulator; the ground pin of the switching regulator is grounded;
the bootstrap voltage pin of the switching regulator is connected with one end of a sixth capacitor (C16); the other end of the sixth capacitor (C16) is connected with a switching node pin of the switching regulator, one end of a first inductor (L1) and the negative electrode of a third diode (D14);
the anode of the third diode (D14) is grounded; the other end of the first inductor (L1) is connected with a sixteenth resistor (R51), a seventh capacitor (C18), an eighth capacitor (C19), one end of a ninth capacitor (C20) and the first voltage output end;
the other end of the sixteenth resistor (R51) is connected with one end of a seventeenth resistor (R52) and a feedback pin of the switching regulator; the seventeenth resistor (R52) has the other end grounded;
and the other ends of the seventh capacitor (C18), the eighth capacitor (C19) and the ninth capacitor (C20) are all grounded.
4. The data display device of claim 3,
the fifth capacitance (C17) is 4.7 microfarads; the sixth capacitance (C16) is 100 nanofarads; the seventh capacitance (C18) is 10 microfarads; the eighth capacitance (C19) is 10 microfarads; the ninth capacitor (C20) is 100 nanofarads;
the fifteenth resistance (R65) is 100 kilo-ohms; the sixteenth resistance (R51) is 63.4 kilo-ohms; the seventeenth resistance (R52) is 10.7 kilo-ohms;
the first inductance (L1) is 33 microHenry; the third diode (D14) is MBR0520LT 1G.
5. The data display device of claim 2, wherein the second voltage conversion device comprises:
the fourth voltage input end is connected with one end of a tenth capacitor (C22), one end of an eleventh capacitor (C23), and a first voltage input pin and a second voltage input pin of the voltage stabilizer;
the other ends of the tenth capacitor (C22) and the eleventh capacitor (C23) are grounded; the ground pin of the voltage stabilizer is grounded;
the output voltage pin of the voltage stabilizer is connected with one end of a twelfth capacitor (C24), a thirteenth capacitor (C25), a fourteenth capacitor (C21) and one end of a magnetic bead (R12);
the other ends of the twelfth capacitor (C24), the thirteenth capacitor (C25) and the fourteenth capacitor (C21) are all grounded; and the other end of the magnetic bead (R12) is connected with the second voltage output end.
6. The data display device of claim 5,
the tenth capacitance (C22) is 1 microfarad; the eleventh capacitance (C23) is 100 nanofarads; the twelfth capacitor (C24) is 1 microfarad; the thirteenth capacitor (C25) is 100 nanofarads; the fourteenth capacitance (C21) is 100 picofarads; the magnetic bead (R12) is 0 ohm.
7. The digital-to-analog conversion apparatus according to claim 2, wherein the third voltage conversion apparatus comprises:
the fifth voltage input end is connected with one end of a fifteenth capacitor (C32), one end of a sixteenth capacitor (C31) and a power supply voltage input pin of the voltage conversion chip;
the other ends of the fifteenth capacitor (C32) and the sixteenth capacitor (C31) are grounded; the ground pin of the voltage conversion chip is grounded;
the reference voltage output pin of the voltage conversion chip is connected with one end of a seventeenth capacitor (C55), an eighteenth capacitor (C33) and one end of a second inductor (L2);
the other ends of the seventeenth capacitor (C55) and the eighteenth capacitor (C33) are grounded; the other end of the second inductor (L2) is connected with a nineteenth capacitor (C54) and the third voltage output end;
the nineteenth capacitor (C54) has the other end grounded;
the fifteenth capacitor (C32) is 4.7 microfarads, the sixteenth capacitor (C31) is 100 nanofarads, the seventeenth capacitor (C55) is 1 microfarad, and the eighteenth capacitor (C33) is 100 nanofarads; the nineteenth capacitor (C54) is 100 nanofarads; the second inductance (L2) is 10 microHenry.
8. The digital-to-analog conversion apparatus according to claim 2, wherein the fourth voltage conversion apparatus comprises:
the sixth voltage input end is connected with one end of a twentieth capacitor (C4), one end of a twenty-first capacitor (C7), an input voltage pin of an output power supply, the first logic input pin and the second logic input pin; the twentieth capacitor (C4) has the other end grounded; the other end of the twenty-first capacitor (C7) is grounded and is connected with the mode pin of the output power supply;
the positive connecting pin of the suspension capacitor of the output power supply is connected with one end of a twenty-second capacitor (C6); the other end of the twenty-second capacitor (C6) is connected with a negative connecting pin of the suspension capacitor of the output power supply;
an output voltage pin of the output power supply is connected with one end of a twenty-third capacitor (C10) and one end of a twenty-fourth capacitor (C12); the other ends of the twenty-third capacitor (C10) and the twenty-fourth capacitor (C12) are grounded;
the input connecting pin of the input power supply is connected with one end of a nineteenth resistor (R54); the nineteenth resistor (R54) has the other end grounded;
the positive low-voltage difference output pin of the input power supply is connected with a twenty-fifth capacitor (C3), a twenty-sixth capacitor (C2), one end of a twentieth resistor (R3) and the fourth voltage output end; the other ends of the twenty-fifth capacitor (C3) and the twenty-sixth capacitor (C2) are grounded;
the other end of the twentieth resistor (R3) is connected with one end of the twenty-first resistor (R4) and a feedback input pin of the positive low dropout regulator of the input power supply; the other end of the twenty-first resistor (R4) is connected with one end of a twenty-seventh capacitor (C5), one end of a twenty-eighth capacitor (C11), one end of a twenty-second resistor (R5) and a ground pin of the input power supply;
the other end of the twenty-seventh capacitor (C5) is connected with a positive reference bypass pin of the input power supply; the other end of the twenty-eighth capacitor (C11) is connected with a negative reference bypass pin of the input power supply; the other end of the twenty-second resistor (R5) is connected with one end of a twenty-third resistor (R6) and a feedback input pin of the negative low dropout regulator of the input power supply;
the other end of the twenty-third resistor (R6) is connected with one end of a twenty-ninth capacitor (C8), one end of a thirty-third capacitor (C9), a negative low-voltage-difference output pin of the input power supply and the fifth voltage output end; the twenty-ninth capacitor (C8), the thirty capacitor (C9), the other end is grounded.
9. The digital-to-analog conversion apparatus of claim 8,
the twentieth capacitance (C4) is 10 microfarads; the twenty-first capacitance (C7) is 100 nanofarads; the twenty-second capacitance (C6) is 1 microfarad; the twenty-third capacitance (C10) is 10 microfarads; said twenty-fourth capacitance (C12) is 100 nanofarads; the twenty-fifth capacitance (C3) is 10 microfarads; the twenty-sixth capacitance (C2) is 100 nanofarads; the twenty-seventh capacitance (C5) is 10 nanofarads; the twenty-eighth capacitance (C11) is 10 nanofarads; the twenty-ninth capacitance (C8) is 10 microfarads; the thirtieth capacitor (C9) is 100 nanofarads;
the nineteenth resistance (R54) is 200 kilo-ohms; the twentieth resistance (R3) is 330 kilo-ohms; the twenty-first resistance (R4) is 100 kilo-ohms; the twenty-second resistance (R5) is 100 kilo-ohms; the twenty-third resistance (R6) is 330 kilo-ohms.
10. The digital-to-analog conversion apparatus according to any one of claims 1 to 9,
the first resistance (R55) is 10.2 kilo-ohms; the second resistance (R56) is 360 ohms; the third resistance (R1) is 33 kilo-ohms; the fifth resistance (R8) is 33 kilo-ohms; the sixth resistance (R58) is 360 ohms; the seventh resistance (R57) is 10.2 kilo-ohms; the eighth resistance (R49) is 33 kilo-ohms; the tenth resistance (R48) is 10.2 kilo-ohms; the eleventh resistance (R47) is 360 ohms; the twelfth resistance (R50) is 33 kilo-ohms; the thirteenth resistance (R59) is 10.2 kilo-ohms; the fourteenth resistance (R60) is 360 ohms;
the first capacitance (C1) is 10 nanofarads; the second capacitance (C13) is 10 nanofarads; the third capacitance (C15) is 10 nanofarads; the fourth capacitance (C14) is 10 nanofarads.
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