AD7847ANZ

Overview

The AD7847ANZ is a dual 12-bit multiplying digital-to-analog converter (MDAC) manufactured by Analog Devices Inc. It features an R-2R segmented architecture with internally buffered voltage outputs and integrated feedback resistors. The device operates on dual power supplies ranging from ±14.25 V to ±15.75 V, consuming typically 8 mA for VDD and 6 mA for VSS. Key static performance metrics include a relative accuracy of ±1 LSB maximum and differential nonlinearity of ±1 LSB. AC characteristics specify 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.

Feature Summary

• Dual 12-bit MDAC architecture with internal R-2R ladder and buffered voltage outputs
• Integrated feedback resistors eliminate external components for standard configurations
• Parallel interface with independent chip select inputs (CSA, CSB) and common write input (WR)
• Guaranteed monotonic operation with ±1 LSB INL/DNL specifications

Applications

• Programmable gain amplifier circuits utilizing the DAC as a programmable resistor
• Four-quadrant analog multiplication and signal processing
• Audio panning circuits requiring precise channel balancing
• Microprocessor-based control systems for industrial automation

Procurement Notes

Verify package integrity upon receipt, as the component is sensitive to electrostatic discharge. Ensure proper handling procedures are followed during storage and assembly. Confirm that the ordering suffix 'ANZ' corresponds to the Plastic DIP (N-24) package variant with lead-free compliance as indicated in the manufacturer's documentation.

Selection Notes

Select the AD7847ANZ when a dual-channel solution with parallel interface and internal buffering is required. This model is suitable for applications needing ±1 LSB linearity and 3 µs settling time. Compare against the AD7837 if an 8-bit microprocessor interface with separate LDAC control is preferred, or consider the AD7847ARZ for surface-mount SOIC packaging requirements.

Part Context

The AD7847ANZ belongs to the AD7837/AD7847 family of high-speed multiplying DACs. While the AD7837 utilizes an 8-bit data bus with address lines for latch selection, the AD7847 employs a direct 12-bit parallel interface with dedicated chip selects for each channel. Both devices share identical electrical specifications and architectural features, differing primarily in their digital input logic structure.

Replacement Considerations

The AD7847BNZ offers improved relative accuracy of ±1/2 LSB while maintaining the same package and pinout. For surface-mount applications, the AD7847ARZ provides equivalent electrical performance in a 24-Lead SOIC package.