AD7846KN

Overview

The AD7846KN is a 16-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. utilizing LC2MOS technology. It features a segmented architecture ensuring guaranteed 16-bit monotonicity over temperature with ±2 LSBs integral linearity error for K versions. The device includes an on-chip output amplifier configurable for unipolar (0 V to +5 V, 0 V to +10 V) or bipolar (±5 V, ±10 V) ranges via the RIN pin. 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. Key specifications include a typical settling time of 6 µs, power dissipation of 100 mW, and a microprocessor-compatible interface with readback capability.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature
• Segmented architecture providing ±2 LSBs INL for K versions
• On-chip buffered output amplifier supporting unipolar and bipolar configurations
• Microprocessor interface with I/O latch readback functionality

Applications

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

Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide to confirm package type and temperature range. The 'K' suffix denotes commercial temperature range (0°C to +70°C), while 'B' indicates industrial range (-40°C to +85°C). Ensure the plastic DIP package variant matches the required footprint. Confirm RoHS compliance status as specified in the current datasheet revision.

Selection Notes

Select the AD7846KN for applications demanding 16-bit precision with low power consumption. The K version is suitable for commercial environments operating between 0°C and +70°C. For bipolar operation, connect VREF- to -5 V and configure RIN accordingly. Ensure the load does not exceed 2 kΩ resistive or 1000 pF capacitive limits to maintain stability. Verify that the system timing meets the minimum CS pulse width requirements of 60 ns for write cycles.

Part Context

The AD7846 series employs a unique segmented DAC architecture where four MSBs select segments from a 16-resistor string, feeding a 12-bit DAC. This design ensures monotonicity without requiring tight matching across all bits. The device is available in 28-lead PDIP, CERDIP, PLCC, and LCC packages. It is part of Analog Devices' high-precision data converter lineup, designed for applications where accuracy and speed are critical.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the verified source material.