AD7224KN

Overview

The AD7224KN is an 8-bit voltage-output digital-to-analog converter (DAC) with integrated output amplifiers, fabricated on Analog Devices' LC2MOS process. It features a double-buffered interface for simultaneous updates in multi-DAC systems and operates with single or dual supplies. The device guarantees a total unadjusted error of ±2 LSB maximum over the commercial temperature range (-40°C to +85°C). Key specifications include a settling time of 5 µs for positive full-scale changes and a typical power consumption of 35 mW. The output amplifier can drive loads down to 2 kΩ.

Feature Summary

• Integrated 8-bit DAC and unity-gain output amplifier on a monolithic CMOS chip
• Double-buffered interface logic allows simultaneous update of multiple devices
• Low total unadjusted error of ±2 LSB max over temperature range
• 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 'KN' corresponds to the N-18 package option and the -40°C to +85°C temperature range as listed in the ordering guide. Confirm that the required performance level matches the ±2 LSB total unadjusted error specification for this version. Ensure ESD precautions are observed during handling due to the MOS gate inputs.

Selection Notes

Select the AD7224KN when a commercial temperature range (-40°C to +85°C) is sufficient and a plastic DIP package is preferred. Choose this variant over the LN version if the ±2 LSB error specification meets system requirements, offering a cost-effective solution. Verify that the reference voltage range of +2 V to +12.5 V aligns with the available reference sources in the design.

Part Context

The AD7224 series includes variants with different accuracy grades and packages. The KN suffix denotes the commercial grade version with ±2 LSB error in an 18-pin plastic DIP package. Other versions include the LN for higher accuracy, and extended temperature options like TE/UE. The family shares the same functional architecture but differs in performance specifications and physical form factors.

Replacement Considerations

Direct pin-compatible replacements within the AD7224 family include the AD7224LN for improved accuracy in the same package. For higher accuracy requirements, consider the AD7228 series, though it may require interface adjustments. Verify that any substitute maintains the LC2MOS process characteristics for similar power and speed profiles.