MCP4921-E/P

Digital To Analog Converters Overview

The MCP4921-E/P is a single-channel, 12-bit 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 rail-to-rail output capability. Key electrical specifications include a typical settling time of 4.5 µs, ±0.2 LSB typical DNL, and ±2 LSB typical INL at +25°C. It supports selectable unity or 2x gain outputs and includes a software shutdown mode. The component is specified for operation across an extended temperature range of -40°C to +125°C.

Digital To Analog Converters Feature Summary

• Resistive string architecture providing low differential non-linearity error and fast settling times
• SPI compatible serial interface with support for 20 MHz clock speeds
• Rail-to-rail buffered analog output amplifier with selectable unity or 2x gain
• Integrated power-on reset circuit ensuring reliable startup states

Digital To Analog Converters Applications

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

Digital To Analog Converters Procurement Notes

Verify the ordering suffix 'E' corresponds to the extended temperature grade (-40°C to +125°C) as defined in the official datasheet. Confirm that the '/P' suffix indicates the 8-pin PDIP package type. Ensure the specific revision of DS22248A matches the design requirements. Cross-reference pinout configurations for the PDIP package against the schematic to guarantee correct board layout compatibility.

Digital To Analog Converters Selection Notes

Select this component when a single-channel, high-resolution digital-to-analog conversion is required with SPI connectivity. The 12-bit resolution offers a balance between precision and speed suitable for calibration tasks. Consider the external reference input requirement if higher accuracy than internal references is needed. Evaluate the 20 MHz SPI speed against the microcontroller's capabilities to ensure proper timing margins are met during data transmission.

Digital To Analog Converters Part Context

The MCP4921 belongs to the MCP49x1 family of single-channel DACs, which also includes the 8-bit MCP4901 and 10-bit MCP4911 variants. These devices share identical pinouts, interfaces, and architectural features, differing primarily in resolution. This family is designed for applications requiring precise voltage generation, such as sensor calibration and signal conditioning, within consumer and industrial environments.

Digital To Analog Converters Replacement Considerations

MCP4921-E/MC: Identical functional specifications but housed in an 8-lead DFN package instead of PDIP.

Digital To Analog Converters FAQ

How does the LDAC pin function affect output updates?

The LDAC pin transfers data from the input register to the DAC register. When driven low, it synchronizes the output update. If tied to ground, the output updates on the rising edge of the CS pin.

What is the impact of the gain selection bit on the output range?

Setting the gain bit to 1 results in a unity gain (1x), where the full-scale output is VREF. Setting it to 0 results in a 2x gain, doubling the full-scale output range relative to VREF.

Does the device support unbuffered reference input?

Yes, the VREF input can be configured in unbuffered mode, which allows an input range from 0V to VDD but presents a lower input impedance compared to the buffered mode.