MCP4821T-E/SNVAO

Overview

The MCP4821T-E/SNVAO 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 SPI-compatible serial interface supporting clock frequencies up to 20 MHz. The device incorporates a high-precision internal voltage reference of 2.048V with a temperature coefficient of 50 ppm/°C. Key electrical specifications include a typical settling time of 4.5 µs, integral non-linearity (INL) error of ±4 LSB, and differential non-linearity (DNL) error of ±0.25 LSB. It supports selectable unity or 2x gain outputs and includes hardware shutdown capabilities.

Feature Summary

• Utilizes resistive string architecture for low DNL error and fast settling times
• Features double-buffered registers allowing synchronous DAC updates via LDAC pin
• Includes Power-on Reset (POR) circuitry to ensure reliable power-up states
• Supports simultaneous latching of the DAC output through the LDAC pin

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 requiring battery-powered operation
• Calibration of optical communication devices

Procurement Notes

Verify the VAO suffix indicates automotive qualification status as per official documentation. Confirm package type matches SOIC-8 requirements. Check RoHS compliance and REACH status before procurement. Ensure ordering suffixes align with specific packaging needs such as tape and reel quantities. Validate temperature range specifications against application constraints.

Selection Notes

Select this component when a single-channel 12-bit resolution is required with an internal voltage reference. Consider the 2.7V to 5.5V operating range for compatibility with various system supplies. Evaluate the 4.5 µs settling time against signal update rate requirements. Verify that the SPI interface mode (Mode 0,0 or Mode 1,1) matches the host microcontroller configuration.

Part Context

This part belongs to the MCP4801/4811/4821 family of voltage output DACs. The MCP4821 specifically provides 12-bit resolution, whereas the MCP4801 offers 8-bit and the MCP4811 offers 10-bit resolution. All members share similar architectures, interfaces, and performance characteristics, differing primarily in resolution and channel count within the broader product line.

Replacement Considerations

Direct substitutes within the same family include MCP4821T-E/SN. For dual-channel applications, consider the MCP4822 series. Single-channel variants with external references are available in the MCP49xx series. Verify pinout compatibility and electrical specifications before substituting.