The analog-to-digital converter is an A / D converter, or an ADC, which is usually referred to as an electronic component that converts an analog signal into a digital signal. The usual analog converter is a digital signal that converts an input voltage signal into an output. Since the digital signal itself does not have practical significance, only a relative size is represented. Therefore, any analog-to-digital converter requires a reference simulation as a standard for conversion, and a common reference standard is the maximum convertible signal size. The output of the output indicates the size of the input signal relative to the reference signal.
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1, CS1237 electronic weighing special ADC converter circuit design
The module employs a CS 1237 as a conversion chip for converting a tiny voltage signal to a digital signal having a 24-bit precision. The module signal input can accept a differential signal, and the internal programmable operational amplifier is used to enlarge the weak signal of the input. The 24-bit ADC conversion module is primarily applied to a variety of control, such as electronic scales, sphygmomanometer or intelligent converters. 24-bit ADC conversion dedicated module characteristics based on CS1237 chip:
Module supports differential input, -0.5VCC to + 0.5VCC
Module built-in temperature sensor
Simple two-wire SPI communication
The chip has built-in PGA, and the magnification is optional.
Output signal processing such as weighing sensors
Scenario Link: https://www.cirmall.com/circuit/8638
2, ADS1220 four-channel 4-bit ADC converter schematic / PCB / sample code, etc.
This design shares information such as ADS1220 four-channel 4-bit ADC converter schematic / PCB source file / sample code is for learning reference only. The ADS1220 ADC converter has two by flexible input multiplexer (MUX), low noise, programmable gain amplifier (PGA), two programmable excitation current sources, reference voltage sources, oscillators, low-edge switches and more Differential or four single-ended inputs, and precision temperature sensors. The ADS1220 chip has an ultra-small and low-power 24-bit model converter for I2C interface.
ADS1220 four-channel 4-bit ADC board feature:
Completely integrated TI ADS1220
All IC pins can be used in two connector
Name each signal near the connector
Babyboard friendly 0.1 "
Including plastic joints, it is easier to mount on the bread board (not soldered to board)
Plate size: (750 x 850) Milled (19.0 x 21.5) mm
ADS1220 Features:
Low current consumption in duty cycle is 120μA
Wide power supply range: 2.3 V to 5.5 V
Programmable gain: 1 V / V to 128 V / V
Programmable data rate: up to 2 ksps
Up to 20 effective resolution
Synchronous 50 Hz and 60 Hz suppression in 20 SPS and single-cycle establishment digital filter
Two differential or four single-ended inputs
Double matching programmable current source: 10μA to 1.5 mA
Interior 2.048 V Reference: 5 ppm / ° C (typ) drift
Internal 2% precise oscillator
Internal Temperature Sensors: 0.5 ° C (Typical) Accuracy
SPI compatible interface (mode 1)
Scenario: https://www.cirmall.com/circuit/6919
3. Based on ADC121C021 GROVE analog-to-digital converter schematic / PCB / use tutorial
The XADOW Grove Modular Converter is a device that converts a Grove interface to an XADOW interface for a device that is compatible with XADOW System. It can achieve this: an analog signal from two simulated Grove interfaces will be output by the XADOW I2C bus. The signal from the Grove I2C interface will communicate directly with the XADOW I2C bus, no conversion. The GROVE analog-to-digital converter produces high precision by ADCC121C021 chip, and the ADC121C021 is an I2C compatible and 12-bit analog number converter having an alarm pin.
GROVE modulus converter parameters based on ADC121C021:
Working voltage: 3.3V
A / D resolution: 12 digits
Sample rate: 188.9 KSPS
I2C address variable
Size: 25.43mm x 20.35mm
Scenario: https://www.cirmall.com/circuit/6866
4. Reference design: Broadband RF receiver made by 4 GSPS analog-to-digital converter (ADC)
Describe
Broadband RF (RF) receiver helps to greatly enhance flexibility in radio design. Wide instantaneous bandwidth supports flexible adjustment without having to change hardware and can capture multiple channels with large intervals.
This reference design describes a wideband RF receiver that utilizes a 4 GSPS analog-to-digital converter (ADC) and has a 8 GHz DC coupled full-differential amplifier front end. The front end of the amplifier provides signal gain and allows for collected signals to DC, and balancing-unbalanced transformer coupling input does not do this.
Characteristic
2GHz bandwidth radio frequency sampling solution
Support DC coupling input
Support single-ended or differential input
Complete clock solution
Complete power solution
Program related devices:
TPS74901: Single output LDO, 3.0A, adjustable (0.8 to 3.6V) programmable soft start
TPS723-Q1: Automotive single-channel output LDO, 200mA, high PSRR low noise
TPS54327: 4.5V to 18V input, 3A synchronous buck SWIFTTM converter
SN74LVC1G125: Single bus buffer with tri-state output
LP3878-Adj: micro-power 800mA low noise "ceramic stability" adjustable regulator for 1V to 5V application
LMC6762: Dual-powerful power consumption rail with push-pull output to the rail input CMOS comparator
Scenario: https://www.cirmall.com/circuit/5135
5, single-chip smart fire alarm system + smoke sensing + ADC0832 modulus conversion + temperature detection + digital tube display + button setting + sound buzzer design
The intelligent fire alarm system of this workbook is used in 51 single-chip + MQ-2 smoke sensing + ADC0832 analog-to-digital conversion chip + DS18B20 temperature sensor + digital tube display + button setting + sound photoelectric buzzer design.
1, can set smoke concentration and high temperature alarm value, encounter emergency bursts can emergency alarm and manually cancel the emergency alarm function.
2, when there is a special case, press the emergency alarm button to alarm, and there is a power-down save function, and the parameters set are saved in the SME EEPOM.
3. When the smoke sensor detects the smoke released by the fire, the signal is processed by the ADC0832 to process the analog number to the single chip microcomputer. When the concentration exceeds the standard, the buzzer will make a drop of the alarm while the red light is on.
4. At the same time, this system can also detect temperature, and fire occurs often environmental temperature. When the temperature exceeds the set alarm temperature, the buzzer will also generate alarm while the yellow light is lit.
5, the button's button also has connected, reduced function, and it is very convenient to operate. After the system can enter the setup interface, if no buttons are 30 seconds, they will automatically exit the setup interface.
Spagnetic range:
Tobacco concentration: 0--9 grade
Temperature range: 0--99 degrees
The information includes the following:
1, the principle map source file
2, PCB
3, source program source file
4, devices list
5, refer to the paper
6, partial simulation
7, related operations video
8, production guidance, etc.
9, defense PPT template
10. Some procedures explain the video and schematic diagram
Scenario: https://www.cirmall.com/circuit/13841
6, electric tricycle four-wheeled car 12V25ADC / DC power supply
Suitable for electric tricycles, DC / DC non-isolation converters of four-wheeled vehicles, input voltage is 36V-80V, suitable for 48V, 60V and 72V battery systems.
The output voltage is 12V25A, which is a non-isolated power supply of 300 W. It has been mass production, using the UC3845B power supply chip, simple structure, low cost.
Scenario: https://www.cirmall.com/circuit/11833
7. ADC display based on STM32F103X Proteus Simulation
The STM32F103XRCT6 chip can be used to capture the external analog signal and display a value on the LCD1602, which can be used to simulate the temperature and humidity (remember, using an analog sensor, not a digital sensor) display. Software Proteus8.6 and Keil Uvision5 software.
Scenario: https://www.cirmall.com/circuit/12328
8, single-chip simulation, ADC0809 voltage gauge simulation design, schematic and source sharing
51 single-chip ADC0809 voltmeter (12864 display, program + simulation) parallel port;
The program share part and the remaining packages are placed in the attachment.
#include
#includ12881.lcd12864.h>
SBIT OE = P3 ^ 6;
SBIT EOC = P3 ^ 7;
SBIT Clock = P3 ^ 0;
SBIT ST = P3 ^ 3;
Void LCD12864_Display ();
Unsigned char dat [] = "0.000V";
Unsigned int TMP;
UNSIGNED CHAR ADC;
void main ()
{
EA = 1;
ET0 = 1;
TMOD = 0x02;
TL0 = 206;
TL0 = 206;
Tr0 = 1;
LCD12864_INIT ();
LCD12864_Display ();
While (1)
{
ST = 0;
ST = 1;
ST = 0;
While (! Eoc);
OE = 1;
ADC = P1;
TMP = ADC * 196;
DAT [0] = TMP / 10000 + '0';
DAT [2] = TMP / 1000% 10 + '0';
Scenario: https://www.cirmall.com/circuit/9521
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Source: Circuit Diagram
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