MCP4821T-E/MS

Overview

The MCP4821T-E/MS is a single-channel, 12-bit buffered voltage output Digital-to-Analog Converter (DAC) manufactured by Microchip Technology. It operates on a single supply voltage ranging from 2.7V to 5.5V and features an internal 2.048V voltage reference. The device utilizes a resistive string architecture with SPI compatibility supporting up to 20 MHz clock speeds. Key electrical parameters include a typical settling time of 4.5 µs, operating current of 330 µA at 5V, and rail-to-rail output swing. It supports selectable unity or 2x gain outputs and includes hardware shutdown capabilities.

Feature Summary

• Features a high-precision internal 2.048V voltage reference with low temperature coefficient.
• Provides rail-to-rail analog output capability through a buffered CMOS amplifier.
• Supports simultaneous latching of DAC outputs via the LDAC pin for synchronized updates.
• Incorporates Power-on Reset (POR) circuitry to ensure reliable initialization upon power-up.

Applications

• Set point or offset trimming in industrial control systems
• Sensor calibration for temperature, pressure, and humidity signals
• Precision selectable voltage reference generation
• Portable instrumentation powered by battery sources

Procurement Notes

Verify the specific ordering suffix 'T' indicates tape-and-reel packaging configuration. Confirm the '-E' suffix denotes the extended industrial temperature range specifications (-40°C to +125°C). Ensure the '/MS' package designation matches the required MSOP-8 footprint for PCB layout compatibility. Cross-reference the datasheet revision to confirm pinout consistency.

Selection Notes

Select this component when a single-channel, 12-bit resolution is required with integrated reference voltage. Consider the 4.5 µs settling time for applications demanding rapid signal updates. Evaluate the 330 µA operating current against system power budgets. Verify that the SPI interface mode (Mode 0,0 or Mode 1,1) aligns with the host microcontroller's serial peripheral interface settings.

Part Context

This part belongs to the MCP48X1 family of single-channel DACs, which also includes the 8-bit MCP4801 and 10-bit MCP4811 variants. These devices share identical pinouts, interfaces, and core architectures, differing primarily in resolution and associated linearity error specifications. The family is designed for cost-sensitive applications requiring calibrated analog outputs without external reference components.

Replacement Considerations

Direct functional substitutes within the same package and specification profile include the MCP4801T-E/MS and MCP4811T-E/MS. For dual-channel requirements, the MCP4822T-E/MS offers similar performance characteristics with two independent channels. Verify that any replacement maintains the 12-bit resolution and SPI compatibility if digital interface integrity is critical.