AD7937BR-REEL7

Overview

The AD7937BR-REEL7 is a dual 12-bit current-output digital-to-analog converter manufactured by Analog Devices Inc. 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 features a byte-loading structure for right-justified data, separate reference inputs (VREFA, VREFB), and independent analog ground pins (AGNDA, AGNDB) for each channel. It operates on a nominal 5 V supply (4.5 V to 5.5 V range) and supports TTL and 5 V CMOS logic levels. The BR version guarantees a maximum gain error of 3 LSB over the industrial temperature range of -40°C to +85°C.

Feature Summary

• Dual 12-bit current-output DACs in a single 24-lead SOIC package
• Inherent DAC-to-DAC matching of 0.5% due to monolithic construction
• Separate reference inputs and independent analog ground pins per channel
• Byte-loading structure compatible with 8-bit microprocessors
• Asynchronous CLR line for clearing all registers

Applications

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

Procurement Notes

Verify that the ordering suffix REEL7 corresponds to the specific tape-and-reel packaging configuration required for automated assembly. Confirm that the BR grade meets the strict gain error specifications if high precision is critical for the application design.

Selection Notes

Select the AD7937BR variant when a maximum gain error of 3 LSB is required across the full industrial temperature range. Ensure the system design accommodates the separate AGND pins if differential grounding or biased operation for one channel is necessary. Verify that the output amplifier bandwidth is sufficient to handle the 1 µs settling time specification.

Part Context

This component belongs to the AD7937 family of dual 12-bit DACs. The 'BR' designation indicates the B-grade accuracy version, which offers tighter gain error specifications compared to the A-grade version. The part is manufactured using Linear Compatible CMOS (LC2MOS) process technology.

Replacement Considerations

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