AD7224LP

Overview

The AD7224LP is an 8-bit CMOS digital-to-analog converter (DAC) with integrated output amplifiers, fabricated using Analog Devices' LC2MOS process. It operates within a temperature range of –40 °C to +85 °C and features a total unadjusted error of ±1 LSB maximum. The device utilizes a double-buffered interface for simultaneous updates in multi-DAC systems and supports both single and dual supply configurations. Key electrical parameters include a settling time of 5 µs for positive full-scale changes and a typical power consumption of 35 mW.

Feature Summary

• Integrated 8-bit DAC and unity gain output amplifier on a monolithic CMOS chip
• Double buffered interface logic allowing simultaneous update of multiple devices
• Low total unadjusted error of ±1 LSB max over the operating temperature range
• Compatible with TTL and 5 V CMOS logic levels

Applications

• Microprocessor-based data acquisition systems
• Portable instrumentation requiring low power consumption
• Battery-powered test equipment
• Industrial control systems with single or dual supply requirements

Procurement Notes

Verify the specific ordering suffix P-20A corresponds to the Plastic Leaded Chip Carrier package variant. Confirm that the component meets the required environmental specifications for the –40 °C to +85 °C operating range. Ensure compatibility with system voltage levels, as the reference input must remain non-negative relative to DGND to prevent parasitic transistor action.

Selection Notes

Select the AD7224LP when a total unadjusted error of ±1 LSB is required, distinguishing it from the ±2 LSB AD7224KN variant. Choose this model for applications needing the P-20A surface mount package. Verify that the system can accommodate the minimum load resistance of 2 kΩ and that the reference voltage stays within the specified 2 V to (VDD – 4 V) range for accurate performance.

Part Context

The AD7224 series comprises precision 8-bit voltage-output DACs with built-in amplifiers. The LP variant specifically denotes the commercial temperature grade (–40 °C to +85 °C) with high accuracy (±1 LSB). It belongs to the broader family including DIP, SOIC, and Cerdip packages, offering flexibility for various board layout constraints while maintaining consistent core functionality across the series.

Replacement Considerations

The AD7224LN serves as a direct functional replacement within the same package option, sharing identical electrical characteristics and pinout. Other variants like the AD7224KP offer similar performance but differ in package type. Ensure any substitute maintains the LC2MOS fabrication process to preserve the specified settling times and power consumption profiles.