The MCP4921-E/MS is a 12-bit 1-channel voltage output Digital-to-Analogue Converter with SPI interface uses an external voltage reference. This device offers high accuracy and low power consumption. Communication with the device is accomplished via a simple serial interface using SPI protocols. The MCP4921 device is a single channel DACs which use external voltage reference (VREF). This device provides very high accuracy and low noise performance and are suitable for consumer and industrial applications, such as set point control, offset adjustment and sensor calibration applications. The low power consumption make this device very attractive for many portable and battery-powered applications.