Overview
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.
Features
- Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nano
- Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate
- Onboard DAC8552, 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
-
Raspberry Pi GPIO interface : for connecting with the Pi
-
AD/DA input/output : screw terminals
-
AD input : pinheaders, the pinout is compatible with Waveshare sensor interface standard, easy to connect various analog sensor modules
- 7.68M crystal
-
LM285-2.5 : provides reference voltage for the ADC chip
- Photo resistor
- LED output indicator
- 10K potentiometer
-
DAC8552 : 16bit high-precision DAC, 2ch
- Power indicator
-
ADS1256 : 24bit high-precision ADC, 8ch (4ch differential input)
- ADC testing jumper
- DAC testing jumper
- Power selection jumper
-
ADC reference ground configuration : when AD single 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 |
NC |
NC |
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 |
DAC8552 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 |
Photos

High-Precision AD/DA Board back view

Connecting with RPi A+

Connecting with RPi2 B

Connecting with sensors
Note : the Raspberry Pi and sensors in the photo are NOT included.
Dimension
Development Resources
Wiki : www.waveshare.com/wiki/High-Precision_AD/DA_Board