DAC Shield For Arduino Nano using MCP4725

Rajkumar Sharma        
2080
Project tested

This project features an easy to use Digital to Analog converter (DAC) shield for Arduino Nano. The project is built using MC4725 12Bit DAC IC over I2C communication. The shield directly seats on Arduino Nano and also can be used as stand-alone DAC converter that can be connected to other micro-controller board with help of 5 pin header connector. Output is 0-5V. PCB jumper J1 provided to select the address in case of using multiple modules on the same I2C .

Shield also provided with high current driver circuit, which converters voltage to current and can be used to drive Laser diode or LED. Maximum possible load 500mA.

The  MCP4725  is  a  low-power,  high  accuracy,  single channel,   12-bit   buffered    voltage   output   Digital-to- Analog  Convertor  (DAC)  with  non-volatile  memory (EEPROM).  Its on-board precision output amplifier allows it to achieve rail-to-rail analog output swing. The   DAC   input   and   configuration   data   can   be programmed to the non-volatile memory (EEPROM) by the user using I2C interface command. The non-volatile memory feature enables the DAC device to hold the DAC  input  code  during  power-off  time,  and  the  DAC output  is  available  immediately  after  power-up.  This feature is very useful when the DAC device is used as a supporting device for other devices in the network. The device includes a Power-On-Reset (POR) circuit to ensure  reliable  power-up  and  an  on-board  charge pump  for  the  EEPROM  programming  voltage.  The DAC reference is driven from V DD directly.  In power- down mode, the output amplifier can be configured to present a known low, medium, or high resistance output load. The MCP4725 has an external A0 address bit selection pin. This A0 pin can be tied to V DD or V SS of the user’s application board. The MCP4725 has a two-wire I2C™ compatible serial interfaces for standard (100 kHz), fast (400 kHz), or high speed (3.4 MHz) mode.

The  MCP4725  is  an  ideal  DAC  device  where  design simplicity and small footprint is desired, and for applications  requiring  the   DAC  device  settings  to  be saved during power-off time.

Schematic

Parts List

Connections

Photos

 

PCB

One Response on “DAC Shield For Arduino Nano using MCP4725

  1. Hi Raj kumar… from your name I guess you are from India ! I have been following your projects for the Nano and the latest DAC one is the best. Kudos for the quality documentation that you provide … keep it up. Raghunathan / Chennai – India

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