Microchip MCP4726A1T-E/CH: A Compact 12-Bit DAC with Integrated EEPROM and I2C Interface

In the realm of digital-to-analog conversion, the need for precision, simplicity, and non-volatility is paramount. The Microchip MCP4726A1T-E/CH stands out as a highly integrated single-channel, 12-bit voltage output Digital-to-Analog Converter (DAC) that expertly addresses these requirements. This device combines a DAC, an I2C serial interface, and a non-volatile memory (EEPROM) into a single tiny SOT-23-6 package, offering a powerful and compact solution for a wide array of applications.

The core of the MCP4726A1T-E/CH is its 12-bit resolution DAC, which provides excellent accuracy and fine voltage control. It generates an analog output voltage that is proportional to its digital input code, with a choice of two gain options. The output amplifier allows for rail-to-rail output swing, which is crucial for maximizing the dynamic range when operating from a single power supply, typically between 2.7V and 5.5V.

A defining feature of this IC is its on-board EEPROM memory. This allows the device to store the DAC input code and configuration bit settings permanently. Upon power-up, the MCP4726 automatically reloads the saved data from the EEPROM, enabling it to resume operation at the previously configured output level without requiring any intervention from the system microcontroller. This feature is indispensable for applications that require a specific analog output state immediately after power cycling, enhancing system reliability and autonomy.

Communication is handled via a simple I2C serial interface, supporting standard (100 kbps), fast (400 kbps), and high-speed (3.4 Mbps) modes. This two-wire interface minimizes the number of GPIO pins required from the controlling microcontroller, making it ideal for space-constrained and cost-sensitive designs. The I2C address is hard-wired, allowing for only one device per bus unless external address selection circuitry is added.

The MCP4726A1T-E/CH is designed for low power consumption, a critical factor for portable and battery-powered equipment. It features a normal mode operation and a power-down mode that significantly reduces current consumption to less than a microampere, extending battery life.

Typical applications for this versatile DAC include:

Set-point or offset trimming in sensor calibration and control systems.

Programmable voltage and current sources for test and measurement equipment.

Low-power portable instruments and data acquisition systems.

Closed-loop servo control and motor speed control.

Digital gain and offset adjustment in amplifier circuits.

ICGOOODFIND: The Microchip MCP4726A1T-E/CH is an exceptional integrated solution that marries high-resolution analog output with the convenience of non-volatile memory and a ubiquitous I2C interface. Its small form factor, low power consumption, and power-on recall capability make it a superior choice for designers seeking to add robust, reliable, and self-contained analog output functionality to their systems.

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