MCP4921 Digital-to-Analog Converter: Datasheet, Circuit, Equivalent

MCP4921 Pinout

MCP4921 Symbol

MCP4921 Footprint

MCP4921 3D Model

The MCP4921 is a low-power, low DNL 12-bit Digital to Analog Converter (DAC) with optional 2X buffered output and SPI interface that operates between 2.7 and 5.5V. The MCP4921 are DACs with high accuracy and low noise for industrial applications that require signal calibration or compensation (such as temperature, pressure, and humidity).

• MCP4921: 12-Bit Voltage Output DAC

• Rail-to-Rail Output

• SPI Interface with 20 MHz Clock Support

• Simultaneous Latching of the DAC Output with LDAC Pin

• Fast Settling Time of 4.5 µs

• Selectable Unity or 2x Gain Output

• External Voltage Reference Input

• External Multiplier Mode

• 2.7V to 5.5V Single-Supply Operation

• Extended Temperature Range: -40°C to +125°C

• Set Point or Offset Trimming

• Precision Selectable Voltage Reference

• Motor Control Feedback Loop

• Digitally-Controlled Multiplier/Divider

• Calibration of Optical Communication Devices

• PT8211

• AC7715

• DAC0832

• MCP4725

• AD5421

• AD5420

• AD5410

• AD5422

• AD5412

The MCP4921 are DACs with high accuracy and low noise for industrial applications that require signal calibration or compensation (such as temperature, pressure, and humidity). The resistor string architecture used in MCP4921 devices has the advantages of minimal DNL error, low ratiometric temperature coefficient, and quick settling time. These gadgets are designed to work at a wide variety of temperatures. The MCP492X has double-buffered inputs, allowing the LDAC pin to be used for simultaneous updates. A Power-On Reset (POR) circuit is also included in these devices to ensure reliable power-up. These devices are useful where we need accurate measurement, like low voltage measurement after a voltage divider stage, SetPoint or Offset Trimming, Sensor Calibration.

The MCP4921 is a DAC with a voltage output string. Input amplifiers, rail-to-rail output amplifiers, reference buffers, and shutdown and reset management circuits are among these components. The SPI protocol is used for serial communication. The MCP492X can work with voltages ranging from 2.7 to 5.5 volts. A typical application circuit for a programmable current source is illustrated in the diagram below.

MCP4921 Typical Application Diagram

A sensing resistor is utilized to transform the DAC's voltage output into a digitally selectable current source in the voltage follower shown above. In this case, adding the resistor network as demonstrated in the previous example would be beneficial. The less power dissipated across Rsense, the smaller it is. This, however, reduces the resolution with which the current can be adjusted. The voltage divider, or "window," DAC design reduces the range, boosting resolution around the range of interest. When working with very small sensor voltages, plan on eliminating the amplifier's offset error by storing the DAC's setting under known sensor

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