AD7228ACP

Overview

The AD7228ACP 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 separate 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; VSS = GND). Key electrical parameters include a settling time of 5 µs for positive full-scale changes and 7 µs for negative changes in single-supply mode, with a maximum power dissipation of 1 W.

Feature Summary

• Octal architecture integrating eight independent 8-bit DACs with buffered outputs on one monolithic chip.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and individual latch control via A0-A2 address lines.
• Flexible power supply options supporting both dual supplies (-5 V/VDD) and single supply (+15 V/GND) configurations.
• High-speed performance with 95 ns write pulse compatibility and 5 µs settling time to ±1/2 LSB.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial process control systems utilizing multiple analog outputs.
• Programmable power supplies and setpoint controllers.
• Timing deskew circuits in high-speed digital systems.

Procurement Notes

Verify the specific suffix 'ACP' against the manufacturer's ordering guide, as standard variants typically use suffixes like KNZ or ABRZ. Confirm package availability, as the datasheet lists PDIP, CERDIP, SOIC, and PLCC options. Ensure the source document explicitly defines the 'ACP' designation, as it may represent a specific temperature grade or packaging variant not detailed in the general Rev. D specifications.

Selection Notes

Select this component when a system requires eight isolated 8-bit voltage outputs with minimal board space. 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 requirements align with the 7 µs specification. Check that the load resistance meets the minimum 2 kΩ requirement to maintain specified accuracy.

Part Context

The AD7228 belongs to Analog Devices' LC2MOS family of precision DACs. It is designed to replace discrete solutions or older bipolar DACs by offering higher speed and lower power consumption. The device is pin-compatible across various packages (PDIP, SOIC, PLCC), facilitating design upgrades for existing multi-channel applications without significant layout changes.

Replacement Considerations

Direct replacements depend on the required package and grade. The AD7228KNZ offers the same functionality in a 24-lead PDIP package. For surface-mount applications, the AD7228ABRZ provides equivalent performance in a 24-lead SOIC. Verify that substitute parts meet the specific operating temperature and supply voltage requirements of the original design.