AD7937AR

Overview

The AD7937AR is a dual 12-bit current-output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. in a 24-lead Small Outline Integrated Circuit (SOIC) package. It integrates two monolithic DACs on a single chip, ensuring precise thermal tracking and inherent matching with a typical tolerance of 0.5%. The device operates on a nominal 5 V power supply (VDD) with ±10% tolerance and accepts TTL or 5 V CMOS logic levels. Key electrical specifications include a maximum relative accuracy of ±1 LSB, a gain error of ±6 LSB for the A version, and a maximum output current settling time of 1 µs to 0.01% of full scale. The architecture utilizes an R-2R ladder network with separate analog ground pins for each channel.

Feature Summary

• Dual 12-bit monotonic DACs integrated on a single monolithic LC2MOS chip
• Separate AGNDA and AGNDB pins allow independent biasing of analog grounds
• Byte-loading structure compatible with standard 8-bit microprocessor interfaces
• Asynchronous CLR input for clearing all registers during calibration routines

Applications

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

Procurement Notes

Verify the specific suffix 'AR' corresponds to the Industrial temperature range (-40°C to +85°C) and the ±6 LSB gain error specification. Confirm the package designation matches the 24-lead SOIC form factor. Ensure electrostatic discharge precautions are observed during handling due to the sensitivity of the MOS gate inputs.

Selection Notes

Select the AD7937AR when board space savings from dual-channel integration are required alongside precise thermal tracking between channels. Choose this component over discrete solutions if a 5 V single-supply operation and TTL-compatible digital interface are necessary. Verify that the ±6 LSB gain error meets system requirements; otherwise, consider the B version for tighter accuracy.

Part Context

The AD7937 series consists of two variants: the AD7937AR and the AD7937BR. Both share identical pinouts and functional descriptions but differ in accuracy grades. The AR variant specifies a maximum gain error of ±6 LSB, whereas the BR variant offers a reduced maximum gain error of ±3 LSB. Both operate within the same industrial temperature range and utilize the same 24-lead SOIC package.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.