The High Precision AD/DA Card adds high precision AD/DA functionality to the Raspberry Pi, addressing the absence of these functions on the GPIO interface.

• Standard 40PIN GPIO expander for Raspberry Pi, supported by Raspberry Pi series and Jetson Nano.
• Built-in ADS1256, 8 channels of 24bit high precision ADC (4 differential input channels), sampling speed of 30ksps.
• Built-in DAC8552, 2 channels of 16bit high precision DAC.
• Integrated input via pin headers for connecting analog signals.
• The pin layout is compatible with the Waveshare sensor interface standard, facilitating the connection of various analog sensors.
• Integrated input/output interface via screw terminals for connecting analog/digital signals.
• AD/DA detection circuit mode, facilitating signal demonstration.
• Raspberry Pi GPIO interface: for connection to the Pi.
• AD/DA input/output: screw terminals.
• AD input: pin headers, compatible with the Waveshare sensor interface standard.
• 47.68M crystal.
• LM285-2.5: provides voltage reference for the ADC chip.
• Photoresistor.
• LED output indicator.
• 10K potentiometer.
• DAC8552: 16bit high precision DAC, 2 channels.
• Power indicator.
• ADS1256: 24bit high precision ADC, 8 channels (4 differential input channels).
• ADC test jumper.
• DAC test jumper.
• Power selection jumper.
• ADC ground reference configuration: when the input is single-ended, AINCOM is the reference terminal, which can be connected to GND or external voltage reference.