AD7837BR

Overview

The AD7837BR is a dual 12-bit multiplying digital-to-analog converter (MDAC) manufactured by Analog Devices Inc. It integrates two complete DAC channels with buffered output amplifiers in a single package. The device utilizes LC2MOS technology and an R-2R segmented architecture to achieve high performance. Key electrical specifications include a relative accuracy of ±1/2 LSB, a typical voltage output settling time of 3 µs, 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 maximum power dissipation of 1000 mW. The unit supports parallel data interfaces and functions within an industrial temperature range of –40 °C to +85 °C.

Feature Summary

• Dual 12-bit MDACs with integrated buffered output amplifiers
• High relative accuracy of ±1/2 LSB max across the operating temperature range
• Fast settling time of 3 µs typ and unity gain small signal bandwidth of 750 kHz
• Parallel loading structure compatible with 8-bit microprocessor buses

Applications

• Programmable Gain Amplifiers (PGA)
• Four-quadrant multiplication circuits
• Analog panning circuits for audio applications
• Automatic test equipment

Procurement Notes

Verify the specific suffix 'R' corresponds to the SOIC-24 package option when sourcing components. Confirm that the B version accuracy grade (±1/2 LSB) meets the system requirements compared to the A version (±1 LSB). Ensure proper ESD precautions are observed during handling, as the device is sensitive to electrostatic discharge up to 4000 V.

Selection Notes

Select the AD7837BR over the AD7837AR if higher linearity accuracy (±1/2 LSB vs ±1 LSB) is required for the application. Choose this model for designs requiring a surface-mount SOIC-24 package rather than plastic DIP or ceramic DIP options. Consider the parallel interface complexity; if a simpler serial or independent chip-select interface is preferred, the AD7847 series may be more suitable.

Part Context

The AD7837BR belongs to the AD7837/AD7847 family of LC2MOS complete dual 12-bit MDACs. The AD7837 variant features a shared Chip Select (CS) and address lines (A0, A1) for input latch selection, whereas the AD7847 uses separate CS inputs for each channel. Both families share similar static and dynamic performance characteristics but differ in digital interface logic.

Replacement Considerations

Public confirmed substitute part numbers: None.