AD7847BR

Overview

The AD7847BR is a complete, dual, 12-bit multiplying digital-to-analog converter (MDAC) featuring integrated output amplifiers on a monolithic CMOS chip. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 24-lead SOIC package. The device requires dual power supplies ranging from ±14.25 V to ±15.75 V. Key electrical specifications include a typical voltage output settling time of 3 µs to within ±1/2 LSB, a slew rate of 11 V/µs, and a unity gain small-signal bandwidth of 750 kHz. Relative accuracy for the B version is specified at ±1/2 LSB maximum.

Feature Summary

• Dual 12-bit MDAC architecture with integrated buffered output amplifiers
• Parallel loading structure with independent Chip Select inputs (CSA, CSB) and common Write (WR) input
• Internal feedback resistors eliminate external component requirements for standard configurations
• Guaranteed monotonicity with Differential Nonlinearity (DNL) of ±1 LSB maximum

Applications

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

Procurement Notes

Verify the specific suffix 'BR' corresponds to the 24-lead SOIC package and industrial temperature grade (-40°C to +85°C). Confirm that the B version relative accuracy specification of ±1/2 LSB meets system linearity requirements. Ensure power supply decoupling capacitors are placed close to the VDD and VSS pins to maintain signal integrity.

Selection Notes

Select the AD7847BR over the AD7837 when a single 12-bit parallel data bus interface is preferred, as the AD7847 lacks the separate MS/LS latch structure of the AD7837. Verify that the internal feedback resistors are suitable for the desired load conditions; if external feedback is required, the AD7837 must be used instead. Ensure the digital interface supports the edge-triggered WR logic timing.

Part Context

The AD7847 is part of the AD7837/AD7847 family of LC2MOS complete dual 12-bit MDACs. It shares identical core performance characteristics with the AD7837 but differs in the digital interface logic. The BR variant specifically denotes the commercial/industrial temperature range and surface-mount SOIC packaging option within this product line.

Replacement Considerations

The AD7847ARZ serves as a direct pin-compatible replacement offering the same SOIC package and performance metrics. For through-hole applications, the AD7847BNZ provides equivalent functionality in a 24-PDIP package.