AD7849CNZ

Overview

The AD7849CNZ is a 16-bit serial input multiplying digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It features guaranteed monotonicity over the specified temperature range and supports both unipolar and bipolar output configurations. The device utilizes a versatile three-wire serial interface compatible with standard logic levels, facilitating daisy-chain connections for multi-channel systems. Key electrical parameters include a typical output settling time of 7 μs to 0.006% FSR, an analog supply voltage range of ±14.25 V to ±15.75 V, and a digital supply of 4.75 V to 5.25 V. It operates within a temperature range of -40°C to +85°C and is housed in a 20-lead SOIC package.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature
• Versatile serial interface supporting standalone and daisy-chain modes
• Internal power-up/power-down reset clamps output to 0 V
• Multiplying architecture with external reference inputs

Applications

• Industrial process controls
• PC analog I/O boards
• Instrumentation systems

Procurement Notes

Verify the specific grade suffix 'C' corresponds to the required performance specifications, particularly relative accuracy and linearity errors, as defined in the manufacturer's datasheet. Confirm package availability and lead times through authorized distributors, noting that component status may vary by region.

Selection Notes

Select the AD7849CNZ when 16-bit resolution and high-speed settling are required for serial-controlled applications. Ensure the system design accommodates the dual analog supply rails (±15 V nominal) and separate digital supply. Consider the A-grade variant if 14-bit resolution is sufficient and tighter initial accuracy at 25°C is prioritized over full-range monotonicity guarantees.

Part Context

The AD7849 series includes variants such as the AD7849AN, AD7849AR, and AD7849CRZ. The CNZ designation indicates the commercial temperature grade (-40°C to +85°C) and RoHS-compliant packaging. Other grades like 'A' offer 14-bit effective resolution with different accuracy profiles, while 'B' offers 16-bit resolution with broader error tolerances compared to the 'C' version.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7849BNZ and AD7849ANZ. Verify that the substitute part meets the specific linearity and accuracy requirements of the original design, as performance characteristics vary between grades.