AD7224LR-18REEL

Overview

The AD7224LR-18REEL is an 8-bit voltage-output digital-to-analog converter (DAC) with integrated output amplifiers, fabricated in Analog Devices' LC2MOS process. It features a double-buffered interface for simultaneous updates in multi-DAC systems and operates on single or dual supplies. The device guarantees a total unadjusted error of ±1 LSB over the –40°C to +85°C temperature range. Key electrical parameters include a reference input range of +2 V to +12.5 V, a typical power consumption of 35 mW, and a settling time of 5 μs to ±1/2 LSB. The part is housed in a 20-lead SOIC package.

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 ±1 LSB maximum over the operating temperature range
• Compatible with TTL and 5 V CMOS logic levels

Applications

• Portable instrumentation requiring low power consumption
• Battery-powered systems utilizing single supply operation
• Microprocessor-controlled data acquisition systems
• Programmable gain amplifiers and variable voltage sources

Procurement Notes

Verify that the REEL suffix indicates tape-and-reel packaging rather than tube packaging when ordering. Confirm the LR designation corresponds to the ±1 LSB total unadjusted error specification and the commercial temperature range of –40°C to +85°C. Ensure compatibility with the required 20-lead SOIC footprint during procurement planning.

Selection Notes

Select this component when a low-cost, 8-bit resolution with integrated buffering is required. The LR version offers tighter accuracy (±1 LSB) compared to the KN/LN variants (±2 LSB). Verify that the system can accommodate the minimum load resistance of 2 kΩ and that the reference voltage stays within the specified range relative to the supply voltage.

Part Context

The AD7224 series belongs to Analog Devices' family of precision 8-bit DACs featuring built-in output amplifiers. The LR-18 variant specifically denotes the 20-lead SOIC package option with extended accuracy specifications. This model serves as a cost-effective solution for applications needing direct microprocessor interfacing without external buffer components.

Replacement Considerations

Direct pin-compatible replacements within the same package and accuracy class are limited in public documentation. Consider the AD7224KR-18 for similar performance with ±2 LSB error or the AD7224LP for plastic leaded chip carrier packaging. Verify interface logic compatibility when substituting.