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Raspberry Pi High-Precision AD/DA Expansion Board

Description:

There's no AD/DA function on the Raspberry Pi GPIO interface, this may trouble you in the Pi development. However, it won't be a problem anymore. The High-Precision AD/DA Board allows you to add high-precision AD/DA functions to the Raspberry Pi.

Supported Pi

  • Raspberry Pi 1 Model A+
  • Raspberry Pi 1 Model B+
  • Raspberry Pi 2 Model B
  • Raspberry Pi 3 Model B

Features

  • On-board ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate
  • On-board DAC8532, 2ch 16bit high-precision DAC
  • On-board input interface via pin headers, for connecting analog signal
  • the pin-out is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules
  • On-board input/output interface via screw terminals, for connecting analog/digital signal
  • Features AD/DA detect circuit, easy for signal demonstration



  1. Raspberry Pi GPIO interface: for connecting with the Pi
  2. AD/DA input/output: screw terminals
  3. AD input: pin headers, the pinout is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules
  4. 7.68M crystal
  5. LM285-2.5: provides reference voltage for the ADC chip
  6. Photo resistor
  7. LED output indicator
  8. 10K potentiometer
  9. DAC8532: 16bit high-precision DAC, 2ch
  10. Power indicator
  11. ADS1256: 24bit high-precision ADC, 8ch (4CH differential input)
  12. ADC testing jumper
  13. DAC testing jumper
  14. Power selection jumper
  15. ADC reference ground configuration: when AD single is inputted, the AINCOM is reference terminal, can be connected to GND or external reference voltage

Interface Definition

Pin
Symbol
Description
1, 17
3.3V
Power Supply (3.3V)
2, 4
5V
Power Supply (5V)
3, 5, 7, 8, 10, 18, 22, 24, 26, 27, 28, 29, 32, 36, 38, 40
NCNC
6, 9, 14, 20, 25, 30, 34, 39
GND
Ground
11
DRDY
ADS1256 data ready output, low active
12
RESET
ADS1256 reset input
13
PDWN
ADS1256 sync/power off input, low active
15
CS0
ADS1256 chip select, low active
16
CS1
DAC8532 chip select, low active
19
DIN
SPI data input
21
DOUT
SPI data output
23
SCK
SPI clock
31, 33, 35, 37
GPIO
extend to sensor interface


Example Code

High-Precision-AD-DA-Board-Code.7z

Links:

DAC8532 Product Page: http://www.ti.com/product/DAC8532

ADS1256 Product Page: http://www.ti.com/product/ADS1256

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  • Product Code: 101773
  • Availability: In Stock
  • $34.90