1N4921

Overview

The MCP4921-E/MC is a single-channel, 12-bit Digital-to-Analog Converter (DAC) from Microchip Technology. It utilizes a resistor-string architecture and operates on a single supply voltage ranging from 2.7V to 5.5V. The device features an SPI-compatible serial interface with a maximum clock frequency of 20MHz. Key electrical parameters include a typical settling time of 4.5µs, ±0.2 LSB typical DNL, and ±2 LSB typical INL. It supports external voltage references and offers rail-to-rail buffered output capability.

Feature Summary

• Resistor-string architecture providing low DNL error and fast settling times
• SPI-compatible serial interface supporting up to 20MHz clock speeds
• Integrated power-on reset circuit for reliable startup conditions
• Rail-to-rail buffered output stage suitable for driving various loads

Applications

• Sensor calibration systems requiring precise analog signal generation
• Portable battery-powered instrumentation due to low power consumption
• Motor feedback loop control applications needing accurate setpoints
• Industrial process control loops utilizing digital potentiometer replacement

Procurement Notes

Verify the specific suffix code against official datasheets to confirm package type and temperature range. Ensure the ordering part number matches the required automotive or industrial grade specifications. Confirm RoHS compliance status through manufacturer documentation before procurement. Cross-reference pinouts carefully as variations exist within the broader family.

Selection Notes

Select this component when a single-channel, high-resolution DAC is required with minimal external components. Consider the 8-pin DFN EP package for space-constrained designs. Evaluate the need for buffered outputs versus unbuffered options in related models. Verify that the SPI interface timing meets the system controller's requirements.

Part Context

This device belongs to the MCP49x1 series of 12-bit DACs manufactured by Microchip Technology. The series includes variants with different channel counts and package options. The MCP4921 specifically denotes a single-channel configuration with buffered output capabilities. It is designed for general-purpose data conversion tasks in industrial and consumer electronics.

Replacement Considerations

Official substitutes within the same family include the MCP4901 and MCP4911. These parts share identical pinouts and software compatibility but may differ in output buffering or channel count. Verify mechanical dimensions and thermal characteristics when substituting.