Waveshare Raspberry Pi AD/DA Expansion Sheild Board for Adding High-Precision AD/DA Functions to Raspberry Pi Onboard ADS1256 DAC8552 Sensor Interface The High-Precision AD/DA Board allows you to add high-precision AD/DA functions to the Raspberry Pi Onboard ADS1256, 8ch 24bit high-precision ADC (4ch differential input), 30ksps sampling rate Onboard DAC8552, 2ch 16bit high-precision DAC, up to 30MHz output Onboard input interface via pinheaders, for connecting analog signal Features AD/DA detect circuit, easy for signal demonstration