MCP4725 I2C 12-Bit DAC Breakout Development Board

MCP4725 I2C 12-Bit DAC Breakout Development Board is a high-precision digital-to-analog converter that allows microcontrollers to generate accurate analog voltage levels through a simple I2C interface. This compact breakout board features the Microchip MCP4725 IC, which provides a resolution of 4096 steps, enabling incredibly smooth signal generation for various electronic projects. Consequently, you can easily produce sine waves, complex waveforms, or precise DC offsets from an Arduino, ESP32, or Raspberry Pi. Furthermore, the board includes an onboard non-volatile EEPROM that stores the DAC settings even after power is removed. Therefore, this module represents an ideal solution for engineers who require a reliable and easy-to-implement analog output in digital environments.

Key Features:

• 12-Bit Resolution: The converter divides the reference voltage into 4096 discrete levels, providing high-precision analog output control.
• Onboard EEPROM: Users can save a specific output voltage to the internal memory, ensuring the device returns to that state immediately upon power-up.
• I2C Interface: The module uses a standard two-wire interface, which supports Standard, Fast, and High-Speed modes for versatile communication.
• Selectable I2C Address: An onboard solder jumper allows you to change the address, making it possible to use multiple DAC boards on the same bus.
• Small Form Factor: The tiny breakout design fits perfectly into breadboards and space-constrained enclosures for portable prototypes.

Technical Specifications:

• Resolution: 12-Bit (4096 steps)
• Supply Voltage (V_DD): 2.7 V to 5.5 V
• Output Type: Rail-to-Rail Analog Voltage
• Interface: I2C (supports up to 3.4 Mbps)
• Settling Time: ≈ 6 μs (typical)
• Internal EEPROM: 14-bit (stores DAC input and configuration bits)
• Operating Temperature Range: −40°C to +125°C

Mechanical Specifications:

• PCB Material: FR-4 High-Quality Fiberglass
• Header Pitch: 2.54 mm (0.1 inch)
• Connection Type: 6-pin Through-Hole Header
• Mounting: Breadboard compatible

Dimensions:

• Length: ≈ 15.5 mm
• Width: ≈ 15.5 mm
• Height: ≈ 3.0 mm (without headers)
• Weight: ≈ 2.0 g

Pinout and Wiring:

• VCC: Connect this pin to the power supply (2.7 V − 5.5 V).
• GND: Connect to the common system ground.
• SCL: Connect to the I2C Serial Clock line of your microcontroller.
• SDA: Connect to the I2C Serial Data line of your microcontroller.
• VOUT: This pin provides the analog voltage output signal.
• ADDR: Tie this pin to GND or VCC to change the I2C address bit.

Datasheet Reference:

• Download Microchip MCP4725 12-Bit DAC Datasheet

Commonly Used in:

• Arduino Projects: Adding an analog output to boards that only feature PWM outputs.
• Audio Signal Processing: Generating clean audio tones or modulating signals for sound synthesis.
• Calibration Equipment: Serving as a precise voltage reference for testing other sensors.

Applications:

• Function Generators: Creating sine, square, and sawtooth waves for laboratory testing.
• Variable Power Supplies: Controlling the set-point of an adjustable voltage regulator digitally.
• Sensor Compensation: Adjusting offset or gain in analog sensor signal conditioning paths.
• Motor Control: Providing a variable control voltage for motor driver circuits.

Equivalent Models:

• MCP4728: A quad-channel version of the same DAC series for multi-output needs.
• DAC8571: A 16-bit alternative from TI, however, it requires different library support.
• PCF8591: A common 8-bit DAC/ADC combo, although it offers significantly lower resolution than the MCP4725.

Package Includes:

• 1 x MCP4725 I2C 12-Bit DAC Breakout Development Board
• 1 x 6-Pin Male Header Strip