# Raspberry Pi High-Precision AD/DA Expansion Board

**SKU:** WS11010
**Brand:** Waveshare
**Price:** 46,00 EUR
**Availability:** in stock
**URL:** https://electronics.semaf.at/Raspberry-Pi-High-Precision-AD-DA-Expansion-Board

## Specifications

| Attribute | Value |
|---|---|
| Weight (kg) | 0.2 |

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.

## 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
- 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

| 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 | 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 |

### Resources

[Wiki : http://www.waveshare.com/wiki/High-Precision\_AD/DA\_Board](http://www.waveshare.com/wiki/High-Precision_AD/DA_Board)