AD7846ACHIPS

Overview

The AD7846ACHIPS is a 16-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. utilizing the LC2MOS process. It features a segmented architecture ensuring guaranteed 16-bit monotonicity over temperature with ±2 LSBs integral linearity error for A, B versions. The device includes an on-chip output amplifier configurable for unipolar (0 V to +5 V/+10 V) or bipolar (±5 V/±10 V) ranges. 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. Typical power dissipation is 100 mW. Key specifications include a settling time of 6 μs to 0.006% FSR and a typical glitch impulse of 70 nV-sec.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature using segmented architecture.
• Microprocessor compatible interface with readback capability for diagnostic routines.
• Configurable unipolar or bipolar output ranges via external resistor connections.
• Low power consumption with typical dissipation of 100 mW.

Applications

• Closed-loop control systems requiring high accuracy.
• Automatic Test Equipment (ATE) utilizing register readback.
• Position measurement applications using LVDTs.
• Precision instrumentation signal chains.

Procurement Notes

Verify the specific package type required, as the AD7846 family is available in 28-lead plastic, ceramic, and PLCC configurations. Confirm that the A/B version operating temperature range (-40°C to +85°C) meets system requirements compared to the J/K version (0°C to +70°C). Ensure supply voltages align with the specified limits: VDD/VSS between ±11.4 V and ±15.75 V, and VCC between +4.75 V and +5.25 V.

Selection Notes

Select the AD7846ACHIPS when 16-bit monotonicity and low power are critical. The 'A' suffix denotes the industrial temperature grade (-40°C to +85°C). Consider the internal deglitcher feature which holds the output during code transitions to minimize glitches. Verify interface timing requirements against the provided microprocessor interfacing guidelines for CS, LDAC, and CLR signals.

Part Context

The AD7846 is part of Analog Devices' high-accuracy DAC portfolio built on the proprietary LC2MOS process. This technology enables high precision with low power consumption. The device distinguishes itself from standard R-2R DACs by using a segmented design where MSBs select segments on a resistor string, feeding a 12-bit DAC, which simplifies achieving monotonicity without tight matching of all resistors.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users should consult Analog Devices parametric search tools for comparable parts based on resolution, accuracy, and interface compatibility.