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.
Key Features

Standard Raspberry Pi 40PIN GPIO extension header, supports Raspberry Pi series boards, Jetson Nano

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

Resources
Wiki :www.waveshare.com/wiki/High-Precision_AD/DA_Board

FAQs:

Q: What are the key components of the Waveshare High-Precision AD/DA board?
A: The board features an ADS1256 8-channel 24-bit ADC and a DAC8552 2-channel 16-bit DAC.
Q: What are the sampling rate capabilities of the ADC on the board?
A: The ADS1256 ADC on the board has a sampling rate of up to 30 ksps (kilo samples per second).
Q: Which Raspberry Pi models are compatible with this board?
A: The board is compatible with the Raspberry Pi series boards, including the Raspberry Pi 4, 3, 2, B+, A+, Zero, Zero W, and Zero WH. It also supports the Jetson Nano.
Q: Is any additional software or drivers required to use this board?
A: The product page mentions that demo codes are available for Python and BCM2835 libraries. You might need to install these libraries and any necessary dependencies to get started.
Q: What applications can this board be used for?
A: The board is suitable for various applications that require precise analog signal acquisition and generation, such as data logging, sensor interfacing, signal processing, and control systems.