AD7847AR

Overview

The AD7847AR is a dual, complete, 12-bit multiplying digital-to-analog converter (MDAC) manufactured by Analog Devices Inc. It utilizes LC2MOS architecture and features an R-2R ladder structure with integrated output amplifiers. The device operates on ±15 V power supplies (range ±14.25 V to ±15.75 V) and provides voltage outputs with a settling time of 3 µs typical. It includes internal feedback resistors, eliminating the need for external components. Key static performance metrics include ±1 LSB relative accuracy and ±1 LSB differential nonlinearity. The unit is housed in a 24-lead SOIC package and supports parallel digital interfaces.

Feature Summary

• Dual 12-bit MDACs with integrated buffered voltage outputs
• Internal feedback resistors simplify circuit design
• Parallel interface with independent Chip Select (CSA/CSB) inputs
• LC2MOS technology ensures high speed and low power consumption

Applications

• Programmable gain amplifier circuits
• Four-quadrant analog multiplication
• Analog panning circuits for audio applications
• Precision data acquisition systems

Procurement Notes

Verify the specific suffix 'AR' corresponds to the 24-lead SOIC package option as defined in the ordering guide. Confirm that the required operating temperature range aligns with the industrial specification (-40°C to +85°C). Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7847AR when independent chip select control for each DAC channel is required, distinguishing it from the AD7837 which uses address lines A0/A1. Verify that the 12-bit resolution and 3 µs settling time meet system timing requirements. Ensure the application can accommodate the ±15 V supply rails and that the reference input impedance matches the source capabilities.

Part Context

The AD7847AR belongs to the AD7837/AD7847 family of LC2MOS complete dual DACs. While functionally similar to the AD7837, the AD7847 variant replaces the address-based latch selection with dedicated CSA and CSB pins for simplified microprocessor interfacing. Both devices share identical electrical specifications and architectural features.

Replacement Considerations

The AD7847BR offers the same package and functionality but with improved ±1/2 LSB relative accuracy. For plastic DIP packaging, the AD7847AN is available. No direct pin-compatible replacements with different architectures are documented in the provided source material.