AD7937BR

Overview

The AD7937BR is a dual 12-bit current-output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It integrates two monolithic DACs in a single 24-lead SOIC package, ensuring precise thermal tracking and inherent matching with a typical ladder resistance tolerance of 0.5%. The device operates on a nominal 5 V supply (4.5 V to 5.5 V range) and features a byte-loading structure for right-justified data formats. Key specifications include a maximum gain error of ±3 LSB for the B version, a settling time of 1 µs to 0.01%, and an asynchronous clear line for calibration routines. Both DACs support independent analog ground connections.

Feature Summary

• Dual 12-bit current-output DACs with inherent 0.5% matching
• Byte-loading structure compatible with 8-bit microprocessors
• Asynchronous CLR input for simultaneous register clearing
• Separate AGND pins for each DAC to increase versatility

Applications

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

Procurement Notes

Verify the specific suffix 'BR' indicates the industrial temperature grade (-40°C to +85°C) with ±3 LSB max gain error. Confirm the package type is R-24 (SOIC). Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS internal circuitry.

Selection Notes

Select the AD7937BR when board space is limited and matched dual DAC performance is required. The B version offers tighter gain error specifications compared to the A version. Ensure the application supports current-output topology with external op-amps for voltage conversion. Verify that the system logic levels are compatible with TTL or 5 V CMOS inputs.

Part Context

The AD7937 belongs to the LC2MOS family of data converters from Analog Devices. This process technology combines linear and CMOS capabilities to achieve high speed and low power consumption. The dual-DAC configuration distinguishes it from single-channel counterparts, offering improved channel-to-channel isolation and reduced component count in multi-channel systems.

Replacement Considerations

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