MCP4821T-E/SN

Overview

The MCP4821T-E/SN 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 with a temperature coefficient of 50 ppm/°C. The device utilizes a resistive string architecture and communicates via an SPI interface supporting up to 20 MHz clock speeds. Key electrical specifications include a typical settling time of 4.5 µs, INL error of ±4 LSB, and DNL error of ±0.25 LSB. It offers selectable unity or 2x gain outputs and supports hardware or software shutdown modes.

Feature Summary

• Integrated rail-to-rail output amplifier providing high drive capability and low noise performance.
• Double-buffered registers allow for synchronous updates of the DAC output using the LDAC pin.
• Configurable gain selection enables full-scale range adjustment between 2.048V and 4.096V.
• Power-on Reset circuit ensures reliable power-up with high output impedance until valid commands are received.

Applications

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

Procurement Notes

Verify the ordering suffix 'T' indicates tape-and-reel packaging and 'SN' denotes the SOIC-8 package. Confirm the '-E' suffix corresponds to the extended industrial temperature range of -40°C to +125°C. Ensure compatibility with the required SPI mode and voltage levels before finalizing procurement orders.

Selection Notes

Select this component when a single-channel, 12-bit resolution is required with an internal reference. Compare against MCP4801 (8-bit) and MCP4811 (10-bit) if lower resolution suffices. Consider the MCP4822 if dual-channel functionality is needed instead of single-channel operation.

Part Context

This part belongs to the MCP48X1 family of 8/10/12-bit voltage output DACs. It shares architectural similarities with the MCP49X1 series but differs in having an internal voltage reference rather than requiring an external one. It is distinct from the MCP48X2 series which provides dual-channel configurations.

Replacement Considerations

Direct functional substitutes within the same package and specification include the MCP4821-E/SN (tube packaging). For different packaging requirements, verify pinout compatibility with other SOIC-8 variants in the MCP4801/4811/4821 family.