AD7228ABP

Overview

The AD7228ABP is an octal 8-bit digital-to-analog converter (DAC) fabricated on LC2MOS CMOS technology. It integrates eight voltage-mode DACs with output buffer amplifiers and interface logic on a single monolithic chip, eliminating the need for external trims. The device features individual latches for each channel, accessed via a common 8-bit parallel data bus controlled by A0, A1, and A2 address inputs and an active-low WR signal. It supports dual supplies (VDD: 10.8 V to 16.5 V; VSS: −5.5 V to −4.5 V) or single-supply operation up to 16.5 V. Key performance metrics include a settling time of 5 µs for positive full-scale changes and ±1 LSB total unadjusted error in K/B versions.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and integrated output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS input levels and 95 ns write pulse capability.
• Flexible power supply options supporting both dual (±5 V range) and single-supply configurations.
• Guaranteed monotonicity with ±1 LSB differential nonlinearity and no user calibration required.

Applications

• Automated test equipment requiring programmable timing deskew.
• Industrial control systems utilizing coarse/fine adjustment circuits.
• Multi-channel data acquisition systems needing compact board space solutions.

Procurement Notes

Verify the specific suffix ABP against the manufacturer's ordering guide to confirm package type and temperature grade. Ensure compatibility with existing PCB footprints for the 24-lead PDIP, CERDIP, or SOIC variants. Confirm that the design accounts for the specified power dissipation limits and thermal derating requirements above 75°C.

Selection Notes

Select the AD7228ABP when multiple low-resolution channels are required in a single package. Choose this component over discrete solutions to reduce board area and assembly complexity. Verify that the reference voltage range (2 V to 10 V) aligns with system requirements and that the 2 kΩ minimum load resistance constraint is met for all channels.

Part Context

The AD7228 belongs to the Analog Devices LC2MOS family of high-speed linear-compatible CMOS DACs. This process technology allows the integration of precision analog circuits with high-speed digital logic on one chip. The AD7228 series provides a versatile solution for applications requiring multiple converters, offering pinouts optimized for layout efficiency with analog and digital signals separated on opposite sides of the package.

Replacement Considerations

Direct replacements within the same family include the AD7228ACPZ (PLCC package) and AD7228KNZ (PDIP package). When substituting, verify that the pinout matches the target package style, as the PLCC variant includes Do Not Connect (DNC) pins not present in the 24-lead packages.