ADC-DAC Pi Zero

The ADC-DAC Pi Zero is a 2 channel 12 bit analogue to digital converter and 2 channel 12 bit digital to analogue converter designed to work with the Raspberry Pi. Designed for the same footprint as the Raspberry Pi Zero the ADC-DAC Pi Zero is also compatible with full size Raspberry Pi models.

The ADC-DAC Pi Zero is based on the Microchip MCP3202 A/D converter containing 2 analogue inputs with 12 bit resolution with a Microchip MCP4822 dual channel 12-bit DAC with internal voltage reference.

Power to the board is provided through the host Raspberry Pi using the GPIO port. Only one ADC-DAC Pi Zero can be used on a Raspberry Pi but the extended pins on the GPIO connector allow you to stack the ADC-DAC Pi Zero along with other expansion boards. Mounting holes on the board can be used to securely fit the board on your Raspberry Pi. As the ADC-DAC Pi Zero uses the same footprint as the Raspberry Pi Zero only two of the mounting holes can be used on the larger Raspberry Pi models.

Features

• The A/D and D/A converters communicate with the Raspberry Pi through the SPI interface.

• Max ADC Sample Rate using Python library on a Pi 4: 11,000 samples per second.
• Max ADC Sample Rate using C library on a Pi 4: 17,500 samples per second.
• Max ADC Sample Rate using C++ library on a Pi 4: 17,500 samples per second.
• Max ADC Sample Rate (based on MCP3202 datasheet): 50,000 sps at 2.7V. 100,000 sps at 5V. ADC-DAC Pi operates at 3.3V on Raspberry Pi.
• The ADCDAC Pi Zero is compatible with all Raspberry Pi models from the A+ and B+ onwards.

Specifications

• Vdd: 3.3V
• ADC Input Voltage: 0V to 3.3V
• Maximum ADC Input voltage: VSS–0.6V to VDD+0.6 V
• DAC Output Voltage:
• Gain = 1: 0V to 2.048V
• Gain = 2: 0V to VDD
• Maximum DAC Output Current: 25mA
• SPI voltage: 3.3 V

Documents

• ADC DAC Pi Zero- 3D CAD File (STEP Format)
• Schematic Drawings
• Code Libraries and Demos
• Datasheets