AD7837BNZ

Overview

The AD7837BNZ is a dual 12-bit multiplying digital-to-analog converter (MDAC) with integrated output amplifiers, manufactured by Analog Devices Inc. It utilizes an LC2MOS architecture and R-2R segmented structure to achieve high performance in a space-saving 24-lead plastic DIP package. The device features parallel loading for microprocessor interfacing, settling time of 3 µs typ, and unity gain small signal bandwidth of 750 kHz. Operating on ±15 V supplies, it provides buffered voltage outputs capable of maintaining ±10 V across a 2 kΩ load.

Feature Summary

• Dual 12-bit MDACs with integrated output amplifiers
• Parallel input loading structure optimized for 8-bit data buses
• Simultaneous update capability via LDAC pin
• ±1/2 LSB relative accuracy (B Version)

Applications

• Automatic Test Equipment
• Function Generation
• Programmable Power Supplies

Procurement Notes

Verify the specific B version accuracy grade (+/- 1/2 LSB max) against system requirements. Confirm that the 24-lead Plastic DIP (N-24) package aligns with PCB layout constraints. Ensure supply voltages are within the specified +/- 15V range for optimal linearity performance.

Selection Notes

Select the AD7837BNZ when simultaneous updating of multiple channels is required via the asynchronous LDAC input. Choose this part over the AD7847 if the design relies on an 8-bit wide data bus interface with address lines A0/A1 for latch selection rather than separate chip selects.

Part Context

The AD7837BNZ belongs to the AD7837/AD7847 family of complete dual 12-bit multiplying DACs. The 'BN' suffix indicates a commercial temperature range (-40°C to +85°C), +/- 1/2 LSB accuracy, and a 24-lead Plastic DIP package. The 'Z' suffix denotes lead-free construction compliant with RoHS standards.

Replacement Considerations

The AD7837ANZ serves as a lower-cost alternative with +/- 1 LSB accuracy. For serial interface requirements, the AD7847 offers similar performance but uses a different control logic structure.