AD7937AR-REEL

Overview

The AD7937AR-REEL is a dual 12-bit current-output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. in a 24-lead SOIC package. It integrates two monolithic DACs with separate reference inputs and analog ground pins for each channel, ensuring excellent thermal tracking and matching. The device operates on a nominal 5 V supply with ±10% tolerance and accepts TTL or 5 V CMOS logic levels. Key electrical specifications include a maximum gain error of ±6 LSB for the A version, a typical output current settling time of 0.6 µs to 0.01%, and a digital-to-analog glitch impulse of 2.5 nV-s. It features a byte-loading structure for right-justified data and supports simultaneous updates via an asynchronous clear line.

Feature Summary

• Dual 12-bit current-output DACs in a single monolithic chip with 0.5% typical ladder resistance matching.
• Separate AGND pins for each DAC allow independent biasing and increased application versatility.
• Byte-loading structure with double buffering enables simultaneous update of both DAC registers.
• Asynchronous CLR line allows clearing all registers for calibration routines.

Applications

• Automatic Test Equipment
• Programmable Filters
• Audio Applications
• Synchro Applications
• Process Control

Procurement Notes

Verify the specific suffix 'AR' indicates the industrial temperature range (-40°C to +85°C) and ±6 LSB gain error specification. Confirm the '-REEL' designation corresponds to tape-and-reel packaging as indicated by the ordering guide. Ensure compatibility with 5 V logic levels if interfacing with standard microprocessors.

Selection Notes

Select the AD7937AR for applications requiring dual matched DACs with separate analog grounds. The A version offers ±6 LSB max gain error, while the B version provides tighter ±3 LSB accuracy. Consider the 24-lead SOIC package constraints and the need for external operational amplifiers to convert current outputs to voltage signals.

Part Context

The AD7937 belongs to Analog Devices' family of high-speed, low-power DACs. It utilizes Linear Compatible CMOS (LC2MOS) technology to achieve speed compatibility with most microprocessors. The device is designed to save board space compared to discrete solutions while maintaining precise matching between channels due to monolithic construction.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Evaluate alternatives based on dual-channel configuration, 12-bit resolution, and SOIC-24 package compatibility.