AD7846JNZ

Overview

The AD7846JNZ 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 an integral linearity error of ±2 LSBs for the J version. The device includes an on-chip output amplifier configurable for unipolar or bipolar ranges and supports multiplying operations. 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
• ±2 LSBs integral linearity error (J version)
• Microprocessor compatible interface with DAC register readback
• Configurable unipolar/bipolar output and multiplying capability

Applications

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

Procurement Notes

Verify the specific suffix 'JNZ' against the manufacturer's ordering guide to confirm package type and temperature range. The datasheet lists J and K versions for commercial temperature (0°C to +70°C) and A and B versions for industrial temperature (-40°C to +85°C). Ensure the procurement documentation matches the required operating temperature and physical package constraints for the target application.

Selection Notes

Select the AD7846JNZ when 16-bit monotonicity and low power consumption (100 mW typ) are critical. The J version offers ±2 LSB INL compared to ±4 LSB for the K version. Consider the parallel interface requirements and the need for dual analog supplies (±12V to ±15V) versus single supply alternatives. Verify that the load capacitance does not exceed 1000 pF to maintain stability without external buffering.

Part Context

The AD7846 belongs to the AD7846 series of 16-bit DACs from Analog Devices. It is distinguished by its LC2MOS construction which enables high precision and low power. The device is available in multiple packages including PDIP-28, CERDIP-28, PLCC-28, and LCC-28. The 'J' designation indicates the commercial temperature grade, while 'Z' typically denotes lead-free compliance in Analog Devices nomenclature.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7846KNZ (K version, commercial temp, ±4 LSB INL) and AD7846ANZ (A version, industrial temp, ±2 LSB INL). Cross-family replacements require careful evaluation of interface compatibility and power supply requirements.