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.
Supported Pi
Raspberry Pi 1 Model A+
Raspberry Pi 1 Model B+
Raspberry Pi 2 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--e 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
Package Content
1x High-Precision AD/DA Board
1x RPi screws pack (2pcs)

• 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

The High-Precision AD/DA Board allows you to add high-precision AD/DA functions to the Raspberry PiSainSmart