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.

DOCUMENTATION

Supported Pi

•  Raspberry Pi 1 Model A+

•  Raspberry Pi 1 Model B+

•  Raspberry Pi 2 Model B

•  Raspberry Pi 3 Model B

Features

•  Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate

•  Onboard DAC8532, 2ch 16bit high-precision DAC

•  Onboard input interface via pinheaders, for connecting analog signal

◦                     the pinout is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules

•  Onboard input/output interface via screw terminals, for connecting analog/digital signal

•  Features AD/DA detect circuit, easy for signal demonstration

What's on Board

1. Raspberry Pi GPIO interface : for connecting with the Pi
2. AD/DA input/output : screw terminals
3. AD input : pinheaders, 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 inputted, the AINCOM is reference terminal, can be connected to GND or external reference voltage

Interface Definition