Microchip MCP4728-E/UN: A 12-Bit Quad DAC with I²C Interface and On-Board EEPROM

The Microchip MCP4728-E/UN is a highly integrated, quad-channel, 12-bit digital-to-analog converter (DAC) that combines precision analog output with the simplicity of a digital I²C interface. This device is engineered for applications requiring multiple stable and accurate voltage references, offering a compelling blend of performance, integration, and non-volatile memory storage.

A key feature of the MCP4728 is its four independent voltage output channels, each driven by its own 12-bit DAC. This multi-channel architecture is invaluable for systems that must control or adjust multiple analog set points simultaneously, such as in industrial automation, optical module biasing, or programmable power supplies. Each channel can be configured with its own output gain and voltage reference setting, providing significant design flexibility.

The device communicates via a fast-mode I²C serial interface (up to 3.4 MHz), allowing for rapid output value updates and minimizing the number of GPIO pins required on the host microcontroller. This makes it ideal for space-constrained designs. A standout capability is its on-board non-volatile EEPROM memory. This allows each DAC channel’s output configuration—including the output value, gain setting, and power-down status—to be stored and then automatically recalled at power-up. This ensures the system initializes to a known, predefined state without requiring intervention from the host processor, enhancing system reliability and simplifying startup routines.

The MCP4728 also includes synchronous update functionality. A dedicated LDAC pin allows the host to update all four DAC output channels simultaneously from their internal input registers. This is critical for applications where the relative timing between multiple analog signals is paramount, such as in motion control systems or multi-axis controllers.

Housed in a space-efficient 10-MSOP (UN) package, the MCP4728-E/UN operates over a wide voltage range (2.7V to 5.5V), making it suitable for both 3.3V and 5V systems.

ICGOODFIND: The MCP4728-E/UN is a superior choice for designers seeking a compact, multi-channel DAC solution. Its integral EEPROM memory, quad 12-bit resolution, and flexible I²C interface eliminate the need for external components and simplify system architecture, providing exceptional value in a single package for precision analog output applications.

Keywords: Multi-Channel DAC, I²C Interface, On-Board EEPROM, 12-Bit Resolution, Voltage Reference.