PRODA-004725 - DA CONVERTER 12BIT I2C USING MCP4725 3.3V OR 5V LOGIC

Your microcontroller probably has an ADC (analog > digital converter) but does it have a DAC (digital > analog converter)??? Now it can! This breakout board features the easytouse MCP4725 12bit DAC. Control it via I2C and send it the value you want it to output and the VOUT pin will have it. Great for audio / analog projects such as when you can't use PWM but need a sine wave or adjustable bias point.

We break out the ADDR/A0 pin so you can connect two of these DACs on one I2C bus just tie that pin of one high to keep it from conflicting. Also included is a 6pin header for use in a breadboard. Works with both 3.3V or 5V logic.
Some nice extras with this chip: for chips that have 3.4Mbps Fast Mode I2C (Arduino's don't) you can update the Vout at ~200 KHz. There's an EEPROM so if you write the output voltage you can 'store it' so if the device is power cycled it will restore that voltage. The output voltage is railtorail and proportional to the power pin so if you run it from 3.3V the output range is 03.3V. If you run it from 5V the output range is 05V.

Wiring it up is easy connect VDD to your microcontroller power pin (35V) GND to ground SDA to I2C Data (on the Arduino Uno this is A4 on the Mega it is 20 and on the Leonardo digital 2) SCL to I2C Clock(on the Arduino Uno this is A5 on the Mega it is 21 and on the Leonardo digital 3) and listen on VOUT.

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