AD7224KRZ-1

Overview

The AD7224KRZ-1 is an 8-bit CMOS digital-to-analog converter (DAC) with integrated output amplifiers, manufactured by Analog Devices. It operates within a temperature range of -40°C to +85°C and features a total unadjusted error of ±2 LSB maximum at VDD = +15V and VREF = +10V. The device supports single or dual supply operation, utilizing a reference voltage range from +2V to (VDD – 4V). Key dynamic performance metrics include a settling time of 5µs for positive full-scale changes and 7µs for negative changes, both settling to ±1/2 LSB. The part is housed in a 20-lead SOIC package.

Feature Summary

• Integrated 8-bit DAC and unity gain noninverting CMOS amplifier on a monolithic chip.
• Double buffered interface logic allowing simultaneous updates in multi-DAC systems.
• Low power consumption of 35 mW typical with single supply operation.
• TTL and CMOS (5V) level compatible digital inputs.

Applications

• Microprocessor-based data acquisition systems requiring simultaneous updates.
• Programmable gain amplifiers and variable voltage sources.
• System calibration cycles utilizing the zero override function.

Procurement Notes

Verify the specific suffix 'KRZ-1' against the manufacturer's current ordering guide to confirm package type and temperature grade alignment. Ensure that the required total unadjusted error specification matches the ±2 LSB characteristic associated with this version. Confirm that the application environment remains within the specified -40°C to +85°C operating range.

Selection Notes

Select this component when an 8-bit resolution with integrated buffering is required for space-constrained designs. The double buffered interface is suitable for applications needing synchronized updates across multiple channels. Verify that the reference voltage source can maintain low output impedance under changing load conditions, as input impedance varies with the digital code.

Part Context

The AD7224 belongs to the AD7224 series of precision voltage-output DACs fabricated using Linear Compatible CMOS (LC2MOS) process. This technology integrates high-speed digital logic and precision analog circuits on a single chip, offering improved reliability over multi-chip solutions compared to earlier discrete implementations.

Replacement Considerations

The AD7224LR-1 offers identical R-20 package and functionality but provides a tighter total unadjusted error of ±1 LSB maximum. For extended temperature ranges (-55°C to +125°C), consider the AD7224TE or AD7224UE variants, noting the change in package option.