AD7847BQ

Overview

The AD7847BQ is a dual, 12-bit multiplying digital-to-analog converter (MDAC) with integrated output amplifiers. It features an R-2R segmented architecture and operates within a temperature range of -40°C to +85°C. The device utilizes ±14.25 V to ±15.75 V power supplies and accepts parallel data via separate CSA/CSB chip selects and a common write input. Key performance metrics include a settling time of 3 µs typ, unity gain bandwidth of 750 kHz, and relative accuracy of ±1/2 LSB max. It is housed in a 24-lead Cerdip package.

Feature Summary

• Dual 12-bit MDACs with internal output amplifiers
• ±1/2 LSB maximum relative accuracy
• 3 µs typical voltage output settling time
• Parallel interface with independent DAC channel selection

Applications

• Automatic test equipment
• Function generation
• Waveform reconstruction
• Programmable power supplies
• Synchro applications

Procurement Notes

Verify the Q suffix indicates a Cerdip package during sourcing. Confirm that the B version meets the ±1/2 LSB accuracy requirement for the specific application. Check for MIL-STD-883 Class B processing needs by adding /883B to the part number if required.

Selection Notes

Select the AD7847BQ over the AD7837 when a full 12-bit parallel interface is preferred over an 8-bit bus structure. Ensure the system requires ±15 V supplies as the device is specified for this range, though it functions down to ±12 V. Verify that the Cerdip package fits the board layout constraints.

Part Context

The AD7847BQ belongs to the AD7837/AD7847 family of complete dual MDACs. The 'B' designation specifies ±1/2 LSB linearity, while 'Q' denotes the ceramic dual in-line package. This component integrates the DAC ladder and output buffer on a single LC2MOS monolithic CMOS chip.

Replacement Considerations

The AD7847BN serves as a plastic DIP alternative with identical electrical specifications. The AD7847AR offers the same performance in a surface-mount SOIC package.