AD7228KP

Overview

The AD7228KP 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 chip. The device features separate 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 for positive full-scale changes and 7 µs for negative changes in single-supply mode. The K version specifies a Total Unadjusted Error (TUE) of ±2 LSB.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and individual output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and 95 ns WR pulse support.
• LC2MOS process ensuring high speed and linearity without external trimming.
• Flexible power options supporting dual supplies (-5 V/+15 V) or single +15 V operation.

Applications

• Automated test equipment requiring timing deskew and coarse/fine adjustments.
• Multi-channel signal generation systems utilizing microprocessor control.
• Programmable reference circuits using feedback configurations.

Procurement Notes

Verify the specific suffix 'K' against the manufacturer's ordering guide to confirm static performance grades, as variations exist between K/B and L/C versions. Ensure the package type corresponds to the required footprint, as the KP designation typically indicates a plastic DIP variant. Confirm RoHS compliance status if environmental regulations apply to the target assembly process.

Selection Notes

Select the AD7228KP when board space reduction is critical compared to discrete solutions. Choose this component over the AD7228B or L variants if the specified TUE of ±2 LSB meets system accuracy requirements. Verify that the 2 kΩ minimum load resistance constraint aligns with the downstream circuit impedance. Consider the 5 µs settling time for dynamic applications requiring fast code transitions.

Part Context

The AD7228 belongs to the Analog Devices LC2MOS family of octal DACs. It shares functional similarities with the AD7226 (quad) and AD7227 (hex) but offers eight channels. The device is designed for monolithic integration of precision analog and high-speed digital logic, distinguishing it from earlier bipolar DAC technologies.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.