MCP4921T-E/SN

Digital To Analog Converters Overview

The MCP4921T-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 SPI-compatible serial interface supporting clock frequencies up to 20 MHz. The device utilizes a resistive string architecture with selectable unity or 2x gain output configurations. Key electrical specifications include a typical settling time of 4.5 µs, a maximum Integral Non-Linearity (INL) error of ±12 LSB, and a Differential Non-Linearity (DNL) error of ±0.75 LSB at standard operating conditions. It supports external multiplier mode and includes a software shutdown capability.

Digital To Analog Converters Feature Summary

• Rail-to-rail buffered analog output amplifier
• SPI compatible serial interface with simultaneous latching via LDAC pin
• Software controllable shutdown mode for power savings
• Internal Power-on Reset (POR) circuit for reliable startup

Digital To Analog Converters Applications

• Set point or offset trimming in industrial systems
• Motor control feedback loops
• Calibration of optical communication devices
• Digitally-controlled multiplier/divider circuits

Digital To Analog Converters Procurement Notes

Verify the 'T' suffix indicates tape and reel packaging rather than tube. Confirm the '-E' suffix denotes the extended temperature range (-40°C to +125°C). Ensure the datasheet revision matches the required design specifications. Check for RoHS compliance status as per the manufacturer's current environmental declarations.

Digital To Analog Converters Selection Notes

Select this component when a single-channel 12-bit resolution is required with low DNL performance. The external VREF input allows flexibility in setting the full-scale output range compared to internal reference variants. Verify that the system requires an SPI interface and can accommodate the specific timing constraints of the CS and SCK signals.

Digital To Analog Converters Part Context

This part belongs to the MCP49x1 family of single-channel DACs, which also includes the 8-bit MCP4901 and 10-bit MCP4911. It is distinct from the MCP49x2 series, which offers dual-channel outputs. The SOIC-8 package provides a compact surface-mount solution suitable for space-constrained PCB designs requiring precision analog generation.

Digital To Analog Converters Replacement Considerations

MCP4921-E/SN: Identical functional specifications but supplied in tube packaging instead of tape and reel.

Digital To Analog Converters FAQ

How does the LDAC pin function?

The LDAC pin transfers data from the input register to the DAC register (output latch), allowing synchronous updates of the analog output.

What is the default gain configuration?

The default gain selection is 2x, meaning the full-scale output range is 2*VREF unless configured otherwise via the SPI command.

Can the device operate in multiplier mode?

Yes, the MCP4921 supports an external multiplier mode where the DAC output is proportional to the product of the digital code and the VREF input signal.