AD7224KRZ-18

Overview

The AD7224KRZ-18 is an 8-bit CMOS digital-to-analog converter (DAC) with integrated output amplifiers, manufactured by Analog Devices Inc. It operates within a temperature range of -40°C to +85°C and features a total unadjusted error of ±2 LSB maximum. The device utilizes a double-buffered interface for simultaneous updates in multi-DAC systems and supports both single and dual power supply configurations. Key electrical parameters include a settling time of 5 µs for positive full-scale changes and a reference voltage input range from +2 V to (VDD – 4 V).

Feature Summary

• Integrated 8-bit DAC with unity gain noninverting CMOS output amplifier.
• Double-buffered interface logic allows simultaneous update of multiple devices.
• Operates with single or dual supplies; TTL and 5 V CMOS compatible inputs.
• Low total unadjusted error of less than 1 LSB over the extended temperature range.

Applications

• Microprocessor-based data acquisition systems requiring simultaneous updates.
• Programmable voltage sources and waveform generators.
• Battery-powered instrumentation utilizing single-supply operation.
• Industrial control loops requiring bipolar or unipolar output configurations.

Procurement Notes

Verify the specific suffix 'R-18' corresponds to the 18-Lead SOIC package option when sourcing. Confirm that the K version meets the required ±2 LSB total unadjusted error specification for the target application temperature range. Ensure ESD precautions are observed during handling as the device is sensitive to electrostatic discharge.

Selection Notes

Select this model if an 18-pin surface-mount package is required for space-constrained designs. Choose the LR-18 variant if a tighter accuracy of ±1/2 LSB relative accuracy is needed. Verify that the system reference voltage remains between +2 V and (VDD – 4 V) to maintain specified performance. Consider dual supply operation if improved zero code error and slew rate are critical.

Part Context

The AD7224 belongs to the AD7224 series of precision 8-bit voltage-output DACs fabricated on Linear Compatible CMOS (LC2MOS) process. This technology integrates high-speed digital logic and precision analog circuits on a single chip, offering lower power consumption compared to multi-chip solutions. The KRZ-18 designation specifically identifies the commercial grade version in the standard 18-lead SOIC footprint.

Replacement Considerations

The AD7224LR-18 offers improved relative accuracy (±1/2 LSB max) while maintaining the same package and interface. For applications requiring higher resolution, the AD7228 series provides 8-bit performance with different pinout characteristics. Direct pin-compatible replacements within the same family should be verified against the specific temperature and accuracy requirements.