AD7228ABRZ

Overview

The AD7228ABRZ 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 in 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 supports dual supplies (VDD: 10.8 V to 16.5 V; VSS: -5 V ± 10%) or single supply operation (VDD: 13.5 V to 16.5 V). Key performance metrics include a settling time of 5 µs for positive full-scale changes and 7 µs for negative changes, with INL/DNL errors of ±1 LSB.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and buffered outputs on one monolithic chip.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and individual latch control.
• Flexible power supply options supporting both dual (-5 V/VDD) and single (+15 V/GND) configurations.
• High-speed performance with 95 ns write pulse compatibility and 5 µs settling time.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial process control systems utilizing multiple analog outputs.
• Data acquisition systems needing precise voltage reference distribution.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify the specific grade suffix 'B' against the manufacturer's ordering guide to confirm static performance tolerances, such as Total Unadjusted Error and temperature coefficients. Ensure the package type matches the design requirements, as the AB designation corresponds to the 24-lead SOIC form factor. Confirm RoHS compliance status if required by the target assembly environment.

Selection Notes

Select this component when board space reduction is critical due to its integration of eight converters. Ensure the application can accommodate the required reference voltage range of 2 V to 10 V. For single-supply designs, verify that the negative settling time specifications meet system timing constraints, as they are slightly longer than in dual-supply modes. Check load requirements against the 2 kΩ minimum resistance specification.

Part Context

The AD7228 series belongs to Analog Devices' LC2MOS family, designed to integrate high-speed digital logic with precision analog circuits. The AB variant specifically denotes the commercial grade version housed in a 24-lead Small Outline Integrated Circuit (SOIC) package. This packaging facilitates surface-mount assembly while maintaining pinout compatibility with through-hole versions like the PDIP.

Replacement Considerations

Direct replacements within the same package and pinout include other AD7228 variants such as AD7228ANZ or AD7228KNZ, provided the electrical grades match the application's accuracy requirements. Cross-package substitutions require careful schematic review due to potential pinout differences between SOIC, PDIP, and PLCC formats.