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MCP4902/4912/4922
8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with SPI Interface
Features
• • • • • • • • • • • • MCP4902: Dual 8-Bit Voltage Output DAC MCP4912: Dual 10-Bit Voltage Output DAC MCP4922: Dual 12-Bit Voltage Output DAC Rail-to-Rail Output SPI Interface with 20 MHz Clock Support Simultaneous Latching of the Dual DACs with LDAC pin Fast Settling Time of 4.5 µs Selectable Unity or 2x Gain Output External Voltage Reference Inputs External Multiplier Mode 2.7V to 5.5V Single-Supply Operation Extended Temperature Range: -40°C to +125°C
Description
The MCP4902/4912/4922 devices are dual 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 SPI compatible Serial Peripheral Interface. The user can configure the full-scale range of the device to be VREF or 2 * VREF by setting the Gain Selection Option bit (gain of 1 of 2). The user can shut down both DAC channels by using SHDN pin or shut down the DAC channel 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 ktypical. 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 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 MCP4902/4912/4922 devices are available in the PDIP, SOIC and TSSOP packages.
Applications
• • • • • Set Point or Offset Trimming Precision Selectable Voltage Reference Motor Control Feedback Loop Digitally-Controlled Multiplier/Divider Calibration of Optical Communication Devices
Related Products(1)
P/N MCP4801 MCP4811 MCP4821 MCP4802 MCP4812 MCP4822 MCP4901 MCP4911 MCP4921 MCP4902 MCP4912 MCP4922 DAC No. of Resolution ChannelS 8 10 12 8 10 12 8 10 12 8 10 12 1 1 1 2 2 2 1 1 1 2 2 2 External Internal (2.048V) Voltage Reference (VREF)
Package Types
14-Pin PDIP, SOIC, TSSOP
VDD 1 NC 2 CS 3 SCK 4 SDI 5 NC 6 NC 7
14 VOUTA
MCP49X2
13 VREFA 12 VSS 11 VREFB 10 VOUTB 9 SHDN 8 LDAC
Note 1: The products listed here have similar AC/ DC performances.
MCP4902: 8-bit dual DAC MCP4912: 10-bit dual DAC MCP4922: 12-bit dual DAC
2010 Microchip Technology Inc.
DS22250A-page 1
MCP4902/4912/4922
Block Diagram
LDAC CS SDI SCK
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Interface Logic
Power-on Reset
VDD
Input Register A
Input Register B DACB Register
VSS
DACA.