Microchip MCP4726A0T-E/CH: A Comprehensive 12-Bit DAC with Integrated EEPROM and I²C Interface

The Microchip MCP4726A0T-E/CH is a single-channel, 12-bit digital-to-analog converter (DAC) that stands out for its high level of integration, precision, and ease of use. This device combines a DAC, a non-volatile memory (EEPROM), and an I²C serial interface in a compact SOT-23-6 package, making it an ideal solution for a wide array of applications requiring reliable analog output generation.

At the core of the MCP4726 is a 12-bit voltage output DAC capable of generating analog signals with high accuracy. The DAC output is buffered by a low-power, high-precision amplifier, providing a strong drive capability while minimizing static power consumption. The output voltage range is rail-to-rail, typically set by the supply voltage (VDD), which can range from 2.7V to 5.5V. This flexibility allows the DAC to operate from a single supply and be compatible with various logic levels, making it suitable for both 3.3V and 5V systems.

A defining feature of this IC is its on-board non-volatile EEPROM memory. This memory allows the device to store the DAC input code and configuration bits, enabling it to power up with a predefined output voltage without requiring any intervention from the system controller. This is particularly valuable in applications where a specific analog output must be maintained immediately upon startup, such as in industrial set-point control or automotive systems, enhancing both system reliability and simplicity.

Communication is handled via a fast-mode I²C serial interface (up to 400 kHz), which requires only two bus lines (SDA and SCL). This simple two-wire interface reduces the number of GPIOs needed from the controlling microcontroller, simplifying board layout and freeing up critical MCU resources. The MCP4726 also includes a programmable address bit, allowing up to two devices to be connected on the same I²C bus, providing design flexibility for multi-channel applications.

The device offers several power-down modes, selectable via software and storable in EEPROM, which reduce the current consumption to mere microamps. This feature is essential for battery-powered and portable applications where power efficiency is paramount.

Typical applications for the MCP4726A0T-E/CH include:

Programmable voltage and current sources.

Sensor calibration and offset trimming.

Closed-loop servo control.

Portable instrumentation and data acquisition systems.

Setting bias points for power amplifiers (PAs) in communication equipment.

ICGOODFIND: The MCP4726A0T-E/CH from Microchip is a highly integrated and versatile 12-bit DAC solution. Its combination of on-chip EEPROM, a simple I²C interface, and low-power operation in a tiny package makes it an excellent choice for designers seeking to add a reliable, self-contained analog output to their systems with minimal component count and design effort.

Keywords: 12-Bit DAC, I²C Interface, On-Board EEPROM, Voltage Output, Low Power Consumption.