High-Precision AD/DA Expansion Board for Raspberry Pi
Description
There’s no Analog-to-Digital/Digital-to-Analog (AD/DA) function on the Raspberry Pi GPIO interface, which can restrict the use of certain components in your project. This High-Precision AD/DA Board allows you to add high-precision AD/DA functions to your Raspberry Pi!
Note: Sensors pictured but not included!
Features
- Standard Raspberry Pi 40-pin GPIO extension header
- Onboard ADS1256, 8-channel 24-bit high-precision ADC (4ch differential input), 30ksps sampling rate
- Onboard DAC8552, 2-ch 16-bit high-precision DAC
- Onboard input interface via pin headers, for connecting analogue signal
- the pinout is compatible with Waveshare sensor interface standard, easy to connect various analogue sensor modules
- Onboard input/output interface via screw terminals, for connecting analogue/digital signal
- Features AD/DA detect circuit, easy for signal demonstration
Resources
What’s onboard?
- Raspberry Pi GPIO interface: for connecting with the Pi
- AD/DA input/output : screw terminals
- AD input: pin headers, the pinout is compatible with Waveshare sensor interface standard, easy to connect various analogue sensor modules
- 7.68M crystal
- LM285-2.5: provides the reference voltage for the ADC chip
- Photoresistor
- 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
| 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 |
Price: £ 27.50