AD7224KR-18

Overview

The AD7224KR-18 is an 8-bit voltage-output digital-to-analog converter (DAC) with integrated output amplifiers, fabricated on a monolithic CMOS chip using Linear Compatible CMOS (LC2MOS) process. It features double-buffered interface logic for simultaneous updates in multi-DAC systems and requires no external trimming. The device operates from single or dual supplies, supporting reference voltages from +2 V to +12.5 V. Key electrical parameters include a total unadjusted error of ±2 LSB maximum over the temperature range, a settling time of 5 µs for positive full-scale changes, and a typical power consumption of 35 mW with a single supply.

Feature Summary

• Integrated 8-bit DAC and unity-gain output amplifier on a single LC2MOS CMOS chip
• Double-buffered interface logic allowing simultaneous update of multiple devices
• Low total unadjusted error of less than 1 LSB over temperature for extended versions
• Compatible with TTL and 5 V CMOS logic levels

Applications

• Microprocessor-based data acquisition systems
• Programmable gain amplifiers
• Programmable power supplies
• Waveform generation circuits

Procurement Notes

Verify the specific suffix 'KR-18' against the manufacturer's ordering guide to confirm the package type (SOIC) and temperature range (-40 °C to +85 °C). Ensure that the application environment does not exceed the absolute maximum ratings, particularly regarding power dissipation and lead soldering temperatures. Confirm compatibility with system ground management requirements to minimize noise between AGND and DGND.

Selection Notes

Select this component when an 8-bit resolution with integrated buffering is required without external trimming. The KR-18 variant offers a commercial temperature range (-40 °C to +85 °C) and SOIC packaging. For applications requiring lower total unadjusted error, consider the LR-18 version which guarantees ±1 LSB max error. Ensure the reference voltage source can maintain low impedance under varying load conditions, as input impedance varies with the digital code.

Part Context

The AD7224 belongs to Analog Devices' family of precision 8-bit DACs utilizing LC2MOS technology. This process integrates high-speed digital logic with precision analog circuits on the same die. The KR-18 designation specifically identifies the 18-lead Small Outline Integrated Circuit (SOIC) package variant within the standard temperature range series, distinct from ceramic DIP or surface-mount LCCC options.

Replacement Considerations

Direct pin-compatible replacements within the same package and error specification include the AD7224LR-18 for improved accuracy. Other variants like AD7224KN or AD7224KP offer different package styles but share the same core functionality. Verify that any substitute maintains the double-buffered interface timing characteristics and supply voltage requirements.