AD7224KP

Overview

The AD7224KP is an 8-bit voltage-output digital-to-analog converter (DAC) with integrated output amplifiers, fabricated on Analog Devices' LC2MOS process. It operates within a temperature range of –40 °C to +85 °C and features a total unadjusted error of ±2 LSB maximum at VDD = +15 V and VREF = +10 V. The device supports single or dual supply configurations, utilizing VDD ranges from 11.4 V to 16.5 V for dual supplies or approximately 15 V for single supply operation. It employs double-buffered interface logic compatible with TTL and CMOS levels, allowing simultaneous updates in multi-DAC systems. The part is housed in a 20-lead Plastic Leaded Chip Carrier (PLCC) package.

Feature Summary

• Integrated 8-bit DAC and unity-gain output amplifier on a monolithic LC2MOS chip
• Double-buffered interface logic enabling simultaneous update across multiple devices
• Low total unadjusted error of less than 1 LSB over the full operating temperature range for specific versions; ±2 LSB max for KP variant
• TTL and 5 V CMOS level compatible digital inputs with zero override function via RESET line

Applications

• Microprocessor-based data acquisition systems requiring parallel input loading
• Portable instrumentation powered by single supply rails
• System calibration cycles utilizing the zero override capability
• Bipolar output configurations using external resistors and amplifiers

Procurement Notes

Verify the ordering suffix 'P' corresponds to the P-20A Plastic Leaded Chip Carrier package option as defined in the manufacturer's ordering guide. Confirm that the specific revision of the datasheet aligns with the required performance specifications for the intended application environment. Ensure compatibility with the system's power supply voltage ranges and reference input requirements before integration.

Selection Notes

Select the AD7224KP when a 20-lead PLCC package is required for the design. This version offers a total unadjusted error of ±2 LSB maximum, which is suitable for applications where slightly higher error tolerance is acceptable compared to the ±1 LSB LP variant. Ensure the design accommodates the minimum load resistance of 2 kΩ and respects the reference voltage constraints relative to the VDD supply.

Part Context

The AD7224 series comprises precision 8-bit DACs available in various packages including DIP, SOIC, Cerdip, LCCC, and PLCC. The KP model specifically denotes the commercial temperature grade (-40 °C to +85 °C) with the P-20A plastic leaded chip carrier package. It shares the same core LC2MOS architecture and functional block diagram as other variants in the family, differing primarily in packaging and thermal performance ratings.

Replacement Considerations

Direct pin-compatible replacements within the same package include the AD7224LP, which offers improved accuracy (±1 LSB max) in the identical P-20A PLCC package. Other package options such as the AD7224KR-18 (SOIC) or AD7224LN (DIP) require schematic modifications due to different pin counts and layouts.