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Adafruit GP8403 Breakout Board I2C DAC with 12V Booster + NVM - STEMMA QT / qwiic
These are chips that will take I2C or SPI and pop out an analog voltage. We have single channels like the MCP4725 and even quad channel like MCP4728, but one thing most DACs have in common is they max out at whatever the input power is for the chip, which is usually 3V or 5V. The Adafruit GP8403 Breakout Board is a funky exception - it has the ability to output 0-10V analog voltages, so it's useful for devices that have wide voltage input ranges - like audio or op-amps. Note that the DAC outputs have 10uF caps on them (as indicated by the datasheet), so they aren't going to be terribly fast - best for bias setting maybe, instead of trying to generate fast sine waves!
The GP8402 chip has a built-in I2C-to-analog signal converter that linearly converts 12-bit digital values from 0x000 to 0xFFF into two independent analog voltage outputs of 0–5V or 0–10V, with an output voltage error of 0.2%. This chip is great for when you need wide / high voltage range outputs thanks to its built-in booster, we also provide the 12V output from the small on-board DC/DC converter, you can grab up to 100mA if you need to power something externally.
On the back are three A0, A1, and A2 address selection jumpers, so you can connect up to 8 of these DACs on one I2C bus, for up to 16 DAC outputs. Also included is a 6-pin header, for use in a breadboard. Works with both 3.3V or 5V logic, that is handled separately than the boosted DAC outputs.
This chip does have a non-volatile-memory capability so it will boot up into a prior-set voltage. However, it uses a funky bit-banging technique on the I2C lines so while we did get it to work on an ATmega328, you should definitely verify it on your platform since some devices will not let you 'take over' the I2C pins for bit-banging!
User Manual / Datasheet / Example Codes Etc.
Specifications
- Converts signals to dual-channel analog voltage output of 0–5V or 0–10V via I2C interface.
- Single I2C interface supports up to 8 GP8403 units in parallel, selected via 3-bit hardware address A2/A1/A0.
- Input signal range: 12-bit, 0x000 to 0xFFF.
- 0–5V/0–10V output voltage controlled by internal data.
- I2C input signal high-level range: 2.7V to 5.5V.
- Output voltage error: 0.2% (typical).
- Output voltage linearity error: 0.1% (typical).
- Output short-circuit protection: when output pin is shorted to GND, the chip enters protection mode and halts output.
- Startup time: <2ms.
- Operating temperature range: -40℃ to 85℃.
- Product Dimensions: 25.5mm x 22.8mm x 12.0mm / 1.0" x 0.9" x 0.5"
- Product Weight: 3.6g / 0.1oz
Package Includes
- 1x Adafruit GP8403 Breakout Board I2C DAC with 12V Booster + NVM - STEMMA QT / qwiic
