MCP4821T-E/MC

Overview

The MCP4821T-E/MC 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

• Integrates a high-precision internal voltage reference for stable operation without external components.
• Features double-buffered registers allowing synchronous updates via the LDAC pin.
• Supports fast settling times suitable for dynamic signal processing applications.
• Includes power-on reset 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 suffix 'MC' against official datasheets to confirm package type and tape/reel specifications. Ensure the ordering code matches the required temperature range and packaging format. Cross-reference the manufacturer part number with distributor listings to confirm availability and authenticity before procurement.

Selection Notes

Select this component when a single-channel, 12-bit resolution is required with integrated reference capabilities. Consider the 2.7V to 5.5V supply range and SPI interface compatibility with the host microcontroller. Evaluate the 4.5 µs settling time and low power consumption against system performance requirements.

Part Context

This device belongs to the MCP4801/4811/4821 family of voltage output DACs. It shares architectural similarities with the MCP4801 (8-bit) and MCP4811 (10-bit), differing primarily in resolution. Related products include dual-channel variants like the MCP4822 and external reference versions such as the MCP4921.

Replacement Considerations

Direct substitutes within the same family include MCP4821T-E/SN and MCP4821-E/MS. Verify pinout compatibility and thermal resistance differences between MSOP, SOIC, and DFN packages when replacing.

FAQ

What is the function of the SHDN pin?

The SHDN pin allows hardware control of the shutdown mode. When driven low, it turns off most internal circuits to save power, configuring the output to a known high-resistance state.

How is the full-scale output range configured?

The full-scale range is configured by setting the Gain Selection bit in the configuration register. A gain of 1x results in a 2.048V range, while a gain of 2x results in a 4.096V range.

What is the purpose of the LDAC pin?

The LDAC pin transfers data from the input latch register to the DAC register, enabling synchronized updates of the analog output voltage across multiple devices if used in conjunction with other DACs.