AD7228KRZ-REEL

Overview

The AD7228KRZ-REEL is an octal 8-bit digital-to-analog converter (DAC) manufactured by Analog Devices Inc. It integrates eight voltage-mode DACs with output buffer amplifiers and interface logic on a single LC2MOS chip. The device features individual latches for each channel, controlled via a common 8-bit parallel data bus and address inputs (A0-A2). It operates with dual supplies (VDD: 10.8 V to 16.5 V; VSS: -5 V ± 10%) or a single 15 V supply. Key electrical parameters include a settling time of 5 µs, total unadjusted error of ±2 LSB, and power consumption of 16 mA at 25°C. The component is housed in a 28-lead PLCC surface-mount package.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and integrated output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and 95 ns write pulse capability.
• LC2MOS fabrication process ensuring high speed and linearity without user trims.
• Supports single-supply (15 V) or dual-supply operation with external reference input.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial control systems utilizing microprocessor-based architectures.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify the specific suffix 'KRZ-REEL' against the manufacturer's current ordering guide to confirm package type and reel specifications. Ensure compatibility with existing PCB footprints for the 28-lead PLCC package. Confirm that the design supports the required voltage ranges and thermal dissipation limits specified in the datasheet.

Selection Notes

Select this component when multiple low-cost, medium-speed DAC channels are required in a compact surface-mount form factor. The AD7228 is suitable for applications where board space is limited but high resolution is not critical. Consider the 5 µs settling time and ±2 LSB accuracy for system timing and precision requirements. Verify that the external reference voltage source can handle the varying input impedance during code transitions.

Part Context

The AD7228 series belongs to Analog Devices' family of octal CMOS DACs. The KRZ variant specifically denotes the industrial temperature range (-40°C to +85°C) and the PLCC package. The REEL suffix indicates tape-and-reel packaging for automated assembly. Other variants in the series include PDIP and CERDIP packages with different performance grades (K, B, L, C versions).

Replacement Considerations

Direct pin-compatible replacements within the same package may be limited due to variations in settling time and accuracy grades. Check for other AD7228 variants (e.g., AD7228KPZ) if leaded packages are acceptable. For surface-mount needs, verify if newer generations from Analog Devices offer similar octal configurations with updated packaging standards.