AD7837AR-REEL

Overview

The AD7837AR-REEL is a dual 12-bit multiplying digital-to-analog converter (MDAC) manufactured by Analog Devices Inc. in a 24-lead SOIC package. It features two independent DAC channels with integrated output amplifiers, utilizing an R-2R segmented architecture for high accuracy. The device operates on ±15 V power supplies (±14.25 V to ±15.75 V) and supports parallel data input via an 8+4 bit loading structure. Key electrical specifications include a typical settling time of 3 µs to within ±1/2 LSB, a slew rate of 11 V/µs, and relative accuracy of ±1 LSB. The unit is designed for industrial temperature ranges (-40°C to +85°C) and provides buffered voltage outputs.

Feature Summary

• Dual 12-bit MDACs with integrated buffered output amplifiers
• Parallel interface optimized for 8-bit microprocessor buses using 8+4 bit loading
• Simultaneous update capability via asynchronous LDAC input
• High channel-to-channel isolation of -95 dB typ

Applications

• Automatic Test Equipment
• Programmable Power Supplies
• Function Generation and Waveform Reconstruction
• Synchro Applications

Procurement Notes

Verify the 'REEL' suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm that the specific revision matches the required manufacturing date code, as older stock may differ from current production runs. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS internal circuitry.

Selection Notes

Select the AD7837AR variant over the AD7847 if interfacing with standard 8-bit wide microprocessors requiring separate address lines for MSB and LSB latches. The AD7837 requires external connection of the feedback resistor (RFBA/RFBB) to the output pins, unlike the internally compensated AD7847. Verify that the application can accommodate the ±15 V supply requirement and the need for external reference voltages.

Part Context

The AD7837 belongs to the AD7837/AD7847 family of complete, dual 12-bit multiplying DACs. The 'AR' designation specifies the commercial/industrial temperature range (-40°C to +85°C) and the SOIC-24 plastic surface-mount package. This component is part of Analog Devices' LC2MOS technology line, designed for precision analog signal processing tasks.

Replacement Considerations

The AD7847AR serves as a functional alternative but utilizes a different 16-bit parallel interface and has internally connected feedback resistors. Pin compatibility exists, but logic control signals (CS/LDAC vs CSA/CSB) and wiring for RFBA/RFBB must be adapted. No other direct pin-for-pin replacements are documented in the provided datasheet.