AD7847BNZ

Overview

The AD7847BNZ is a dual, 12-bit multiplying digital-to-analog converter (MDAC) with integrated output amplifiers. It features a parallel loading structure where data is latched on the rising edge of the Write (WR) signal controlled by Chip Select inputs (CSA/CSB). The device operates from ±15 V power supplies and provides a relative accuracy of ±0.5 LSB. Key electrical parameters include a typical voltage output settling time of 3 µs to within ±0.5 LSB, a slew rate of 11 V/µs, and a unity gain small-signal bandwidth of 750 kHz. Channel-to-channel isolation is specified at -95 dB.

Feature Summary

• Dual 12-bit MDAC architecture with internal output amplifiers
• High precision: ±0.5 LSB relative accuracy (B Version)
• Fast settling time: 3 µs typical to ±0.5 LSB
• Parallel interface with independent CSA/CSB chip selects

Applications

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

Procurement Notes

Verify the B suffix indicates ±0.5 LSB accuracy rather than the standard ±1 LSB found in A versions. Confirm the N package designation corresponds to the 24-lead Plastic DIP (N-24) form factor. Ensure RoHS compliance status matches current manufacturing revisions, as older stock may differ.

Selection Notes

Select the AD7847BNZ over the AD7837 series if a direct 12-bit parallel load interface is required without multi-byte write cycles. The B version offers tighter linearity specifications compared to the A version. Ensure the application supports the ±15 V supply requirement for full-scale output swing.

Part Context

This component belongs to the AD7837/AD7847 family of monolithic CMOS multiplying DACs. The AD7847 variant distinguishes itself from the AD7837 by utilizing a simpler parallel loading structure compatible with 16-bit microprocessors, whereas the AD7837 requires two write cycles for 8-bit buses.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.