MCP4902-E/ST Microchip

MCP4902/4912/4922 8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with SPI Interface Features Description MCP4902: Dual 8-Bit Voltage Output DAC The MCP4902/4912/4922 devices are dual 8-bit, 10-bit, and 12-bit buffered voltage output MCP4912: Dual 10-Bit Voltage Output DAC Digital-to-Analog Converters (DACs), respectively. The MCP4922: Dual 12-Bit Voltage Output DAC devices operate from a single 2.7V to 5.5V supply with Rail-to-Rail Output SPI compatible Serial Peripheral Interface. The user SPI Interface with 20 MHz Clock Support can configure the full-scale range of the device to be Simultaneous Latching of the Dual DACs V or 2 * V by setting the Gain Selection Option REF REF with LDAC pin bit (gain of 1 of 2). Fast Settling Time of 4.5 s The user can shut down both DAC channels by using Selectable Unity or 2x Gain Output SHDN pin or shut down the DAC channel individually by setting the Configuration register bits. In Shutdown External Voltage Reference Inputs mode, most of the internal circuits in the shutdown External Multiplier Mode channel are turned off for power savings and the output 2.7V to 5.5V Single-Supply Operation amplifier is configured to present a known high Extended Temperature Range: -40C to +125C resistance output load (500 k typical. Applications The devices include double-buffered registers, allowing synchronous updates of two DAC outputs, Set Point or Offset Trimming using the LDAC pin. These devices also incorporate a Precision Selectable Voltage Reference Power-on Reset (POR) circuit to ensure reliable power- Motor Control Feedback Loop up. Digitally-Controlled Multiplier/Divider The devices utilize a resistive string architecture, with Calibration of Optical Communication Devices its inherent advantages of low DNL error and fast settling time. These devices are specified over the (1) Related Products extended temperature range (+125C). Voltage The devices provide high accuracy and low noise DAC No. of P/N Reference performance for consumer and industrial applications Resolution ChannelS (V ) where calibration or compensation of signals (such as REF temperature, pressure and humidity) are required. MCP4801 8 1 The MCP4902/4912/4922 devices are available in the MCP4811 10 1 PDIP, SOIC and TSSOP packages. Internal MCP4821 12 1 (2.048V) Package Types MCP4802 8 2 14-Pin PDIP, SOIC, TSSOP MCP4812 10 2 MCP4822 12 2 V 1 14 V DD OUTA MCP4901 8 1 NC 2 13 V REFA CS 3 12 MCP4911 10 1 V SS External V SCK 4 11 REFB MCP4921 12 1 5 10 V SDI MCP4902 8 2 OUTB 6 9 SHDN NC MCP4912 10 2 7 8 NC LDAC MCP4922 12 2 MCP4902: 8-bit dual DAC Note 1: The products listed here have similar AC/ MCP4912: 10-bit dual DAC DC performances. MCP4922: 12-bit dual DAC 2010 Microchip Technology Inc. DS22250A-page 1 MCP49X2MCP4902/4912/4922 Block Diagram CS SDI SCK LDAC V Interface Logic DD Power-on Reset Input Input V SS Register A Register B DAC DAC A B Register Register String String V B V A REF REF DAC DAC A B Buffer Buffer Gain Gain Logic Logic Output Op Amps Output Logic V V OUTA SHDN OUTB DS22250A-page 2 2010 Microchip Technology Inc.