AD7837BRZ

Overview

The AD7837BRZ is a dual 12-bit monolithic digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It integrates two complete DAC channels with output amplifiers in a single package, utilizing an LC MOS process and R-2R architecture. The device features a parallel data interface with word input loading, designed for microprocessor systems with 8-bit buses. Key electrical specifications include a maximum relative accuracy of ±1/2 LSB, a typical voltage output settling time of 3 µs to within ±1/2 LSB, and a slew rate of 11 V/µs. It operates on dual power supplies ranging from ±14.25 V to ±15.75 V, with a typical supply current of 8 mA for VDD and 6 mA for VSS.

Feature Summary

• Dual 12-bit MDACs with integrated buffered voltage outputs
• Parallel loading structure compatible with 8-bit microprocessor buses
• High speed performance: 3 µs typical settling time and 11 V/µs slew rate
• ±1/2 LSB relative accuracy with guaranteed monotonicity

Applications

• Automatic Test Equipment
• Function Generation and Waveform Reconstruction
• Programmable Power Supplies
• Synchro Applications
• Programmable Gain Amplifiers

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the SOIC-24 package and industrial temperature range (-40°C to +85°C) as defined in the manufacturer's ordering guide. Confirm RoHS compliance status for the specific manufacturing lot. Ensure that the parallel interface requirements match the target system's bus width and control logic capabilities before procurement.

Selection Notes

Select the AD7837BRZ when a dual-channel solution with high-speed settling and parallel interface is required. The 'B' version offers ±1/2 LSB accuracy compared to the 'A' version's ±1 LSB. The 'R' suffix indicates the SOIC surface-mount package. Consider the AD7847 if a serial interface or independent chip select inputs are preferred over the AD7837's shared CS and address-based latch selection.

Part Context

The AD7837 is part of the AD7837/AD7847 family of dual 12-bit DACs. The AD7837 variant specifically utilizes a parallel interface with a unique 8+4 bit loading structure to facilitate interfacing with 8-bit microprocessors. It shares the same core LC MOS technology and pinout compatibility regarding analog functions with the AD7847, which differs primarily in its digital interface architecture.

Replacement Considerations

The MX7837KR+T is a functional equivalent from Maxim Integrated/Analog Devices offering similar 12-bit dual DAC specifications in a 24-SOIC package. Verify pin compatibility and interface logic differences, as the MX7837 may have different timing requirements or internal feedback resistor configurations.