Adafruit AD5693R DAC Shield

Overview

The Adafruit AD5693R DAC Shield features an Analog Devices AD5693R 16-bit DAC and two STEMMA QT connectors. It has an output span of 2.5 Volt.

Requirements

This shield can be used with boards which provide an I2C connector, for example STEMMA QT or Qwiic connectors. The target board must define a zephyr_i2c node label. See Shields for more details.

Pin Assignments

Shield Pin	Function
SDA	AD5693R I2C SDA
SCL	AD5693R I2C SCL
A0	AD5693R I2C address selection
VREF	AD5693R reference voltage out
LDAC	AD5693R Load DAC input

When using this shield via the STEMMA QT connector, the supply voltage is 3.3 Volt, so the maximum output voltage is 2.5 Volt.

The LDAC pin is pulled down on the shield, forcing an updated output voltage as soon as the input register has been written.

See adi,ad5693 for documentation on how to adjust the devicetree file, for example to adjust the power-down mode.

Programming

Set --shield adafruit_ad5693r when you invoke west build. For example when running the Digital-to-Analog Converter (DAC) sample:

# From the root of the zephyr repository
west build -b adafruit_feather_rp2040 --shield adafruit_ad5693r samples/drivers/dac
west flash

Connect a voltmeter to the shield output and observe how the voltage changes.