D/A converter, 12-bit, 2-channel, SPI, U-reference, DIP-8

12-Bit Dual Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface

Description:
The MCP4822 devices are dual 12-bit buffered voltage output Digital-to-Analog Converters (DACs), respectively. The devices operate from a single 2.7V to 5.5V supply with SPI compatible Serial Peripheral Interface. The devices have a high precision internal voltage reference (VREF = 2.048V). The user can configure the full-scale range of the device to be 2.048V or 4.096V by setting the Gain Selection Option bit (gain of 1 of 2). Each DAC channel can be operated in Active or Shutdown mode individually by setting the Configuration register bits. In Shutdown mode, most of the internal circuits in the shutdown channel are turned off for power savings and the output amplifier is configured to present a known high resistance output load (500 kOhm) typical?. The devices include double-buffered registers, allowing synchronous updates of two DAC outputs using the LDAC pin. These devices also incorporate a Power-on Reset (POR) circuit to ensure reliable powerup. The devices utilize a resistive string architecture, with its inherent advantages of low DNL error, low ratio metric temperature coefficient and fast settling time. These devices are specified over the extended temperature range (+125°C). The devices provide high accuracy and low noise performance for consumer and industrial applications where calibration or compensation of signals (such as temperature, pressure and humidity) are required. The MCP4802/4812/4822 devices are available in the PDIP, SOIC and MSOP packages.

Features:
- MCP4822: Dual 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
- 2.048V Internal Voltage Reference
- 50ppm/°C VREF Temperature Coefficient
- 2.7V to 5.5V Single-Supply Operation
- Extended Temperature Range: -40°C to +125°C

Applications:
- Set Point or Offset Trimming
- Sensor Calibration
- Precision Selectable Voltage Reference
- Portable Instrumentation (Battery-Powered)
- Calibration of Optical Communication Devices