AD7846AP

Overview

The AD7846AP is a 16-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices using the LC2MOS process. It features an on-chip segmented architecture ensuring guaranteed 16-bit monotonicity over temperature, with ±2 LSBs integral linearity error for the A version. The device supports unipolar (0 V to +5 V/+10 V) or bipolar (±5 V/±10 V) output ranges via configurable reference inputs and an internal amplifier. It operates with analog supplies of ±11.4 V to ±15.75 V and a digital supply of +4.75 V to +5.25 V, consuming typically 100 mW. The part includes a microprocessor-compatible parallel interface with readback capability.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature
• Microprocessor compatible interface with DAC register readback capability
• Configurable unipolar or bipolar output voltage ranges
• Low power consumption of 100 mW typical

Applications

• Closed-loop control systems requiring high accuracy
• Automatic Test Equipment (ATE) utilizing readback diagnostics
• Position measurement applications using LVDTs
• Multiplying DAC configurations for signal processing

Procurement Notes

Verify the specific suffix 'AP' corresponds to the industrial temperature range (-40°C to +85°C) as defined in the ordering guide. Confirm package availability matches design requirements, as the component is offered in PDIP, CERDIP, and PLCC formats. Ensure supply chain sources provide original manufacturer documentation to validate revision status.

Selection Notes

Select the AD7846AP when system requirements demand guaranteed 16-bit monotonicity and low power dissipation. The A-version grade offers tighter integral linearity specifications compared to the J-version. Designers must account for the required dual analog supply rails (+/- 15V nominal) and separate digital logic supply. Consider the parallel interface timing constraints if interfacing with high-speed processors.

Part Context

The AD7846 belongs to Analog Devices' family of high-precision LC2MOS DACs. The AD7846AP specifically denotes the ceramic or plastic DIP variant rated for the extended industrial temperature range (-40°C to +85°C). It serves as a precision alternative to R-2R ladder architectures by utilizing a segmented resistor string design to achieve superior linearity and monotonicity without complex trimming.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7846AJ (commercial temperature range) or AD7846BK (industrial temperature range, different package). Cross-vendor equivalents such as the LTC1650 offer similar 16-bit performance but may require interface adaptation due to differing control logic or pinouts.