MCP4801/4811/4821 8/10/12-Bit Voltage Output DAC Converter - Microchip Technology - #1

Text version of the page

„¶ 2010 Microchip Technology Inc. DS22244B-page 1 MCP4801/4811/4821 Features • MCP4801: 8-Bit Voltage Output DAC • MCP4811: 10-Bit Voltage Output DAC • MCP4821: 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 ìs • 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 Description The MCP4801/4811/4821 devices are single channel 8-bit, 10-bit and 12-bit buffered voltage output Digital-to-Analog Converters (DACs), respectively. The devices operate from a single 2.7V to 5.5V supply with an 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). The devices can be operated in Active or Shutdown mode by setting a Configuration register bit or using the SHDN pin. In Shutdown mode, most of the internal circuits, including the output amplifier, are turned off for power savings, while the amplifier output (VOUT) stage is configured to present a known high resistance output load (500 kƒÇƒz typicalƒw. The devices include double-buffered registers, allowing a synchronous update of the DAC output 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 MCP4801/4811/4821 devices are available in the PDIP, SOIC, MSOP and DFN packages. Related Products(1) P/N DAC Resolution No. of Channel Voltage Reference (VREF) MCP4801 8 1 Internal (2.048V) MCP4811 10 1 MCP4821 12 1 MCP4802 8 2 MCP4812 10 2 MCP4822 12 2 MCP4901 8 1 External MCP4911 10 1 MCP4921 12 1 MCP4902 8 2 MCP4912 10 2 MCP4922 12 2 Note 1: The products listed here have similar AC/DC performances. 8/10/12-Bit Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface