AD7228KR-REEL

Overview

The AD7228KR-REEL is an LC2MOS octal 8-bit voltage-mode digital-to-analog converter (DAC) featuring integrated output buffer amplifiers and interface logic. It operates with single or dual supplies, supporting VDD ranges of 10.8 V to 16.5 V (dual) or 13.5 V to 16.5 V (single), with VSS at −5 V or GND. The device accepts a reference voltage between 2 V and 10 V. Key electrical specifications include a maximum Total Unadjusted Error (TUE) of ±1 LSB for L/C versions, a settling time of 5 µs to ±1/2 LSB, and a write pulse width compatibility of 95 ns. Each channel drives a 2 kΩ load with a 10 V swing.

Feature Summary

• Integrates eight independent 8-bit DACs with unity-gain output buffers on a single monolithic chip.
• Microprocessor-compatible interface with TTL/CMOS levels and 95 ns WR pulse support.
• Operates from single (+15 V) or dual (+15 V/−5 V) power supplies with a 2 V to 10 V reference range.
• Guaranteed monotonic performance with no user trims required for specified accuracy.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial control systems utilizing microprocessor-based architectures.
• Programmable power supply designs requiring coarse/fine adjustment capabilities.

Procurement Notes

Verify the 'KR' suffix indicates the specific package type and temperature grade as defined in the official Analog Devices Ordering Guide. Confirm that the 'REEL' designation corresponds to tape-and-reel packaging requirements for automated assembly processes. Ensure the selected grade meets the static and dynamic performance criteria for the intended operating temperature range.

Selection Notes

Select the AD7228 when multiple isolated 8-bit outputs are required within a compact footprint. Choose this component over discrete solutions to reduce board space and improve reliability. Ensure the application can accommodate the 2 kΩ minimum load resistance and that the reference source provides sufficient drive current to handle the code-dependent input impedance variations.

Part Context

The AD7228 utilizes Analog Devices' LC2MOS process, integrating high-speed digital logic with precision analog circuits. This technology enables the monolithic integration of eight DAC channels without external trimming. The device is available in 24-lead PDIP, CERDIP, SOIC, and 28-lead PLCC packages, with the KR variant specifying the package and thermal grade configuration.

Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the datasheet. Evaluate pin-compatible alternatives only if they match the 8-bit resolution, octal architecture, and LC2MOS-like performance characteristics regarding settling time and error specifications.