AD7228ACRZ

Overview

The AD7228ACRZ is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS CMOS technology. It integrates eight DACs with output buffer amplifiers and interface logic on a single chip, eliminating the need for external trims. 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 supply. Key performance metrics include a settling time of 5 µs to ±1/2 LSB, differential nonlinearity of ±1 LSB, and integral nonlinearity of ±0.5 LSB. The component is housed in a 24-lead SOIC package.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and integrated output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and speed compatibility (95 ns WR pulse).
• Operates from dual supplies (-5 V/VDD) or single supply configurations.
• High accuracy specifications including ±0.5 LSB INL and ±1 LSB DNL.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial process control systems utilizing multiple analog outputs.
• Instrumentation applications needing programmable reference voltages.
• Waveform generation circuits requiring coarse/fine adjustment capabilities.

Procurement Notes

Verify the specific grade suffix 'C' against the manufacturer's ordering guide to confirm static performance tolerances relative to other versions like 'K' or 'B'. Ensure the supply chain source provides documentation confirming RoHS compliance status for the CRZ suffix variant. Confirm that the 24-lead SOIC package dimensions match the JEDEC MS-001 standard specified in the datasheet outline drawings.

Selection Notes

Select this component when board space reduction is critical compared to using discrete DACs. Ensure the application requires eight channels with independent latching. Verify that the system can provide the required reference voltage range (2 V to 10 V) and that the load impedance meets the minimum 2 kΩ requirement. Consider the 5 µs settling time constraint for high-speed update requirements.

Part Context

The AD7228 series belongs to Analog Devices' LC2MOS family of precision DACs. The AC designation indicates a specific performance grade within the product line. Other variants include the AD7225 (quad channel) and AD7226 (hex channel), offering different channel counts while maintaining similar interface and performance characteristics. The SOIC package version facilitates surface-mount assembly.

Replacement Considerations

The AD7228ABRZ is a pin-compatible alternative within the same package type but may differ in performance grades. The AD7225LPZ offers a quad-channel configuration in a PLCC package, requiring schematic redesign. Cross-referencing the specific 'C' grade electrical limits with the target application's tolerance requirements is essential before substitution.