AD7228ABR-REEL

Overview

The AD7228ABR-REEL is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS 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 on-chip latches for each channel, accessed via a common 8-bit TTL/CMOS-compatible data bus controlled by A0, A1, and A2 address inputs and an active-low WR signal. It operates from 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 maximum settling time of 5 µs, differential nonlinearity of ±1 LSB, and a typical power supply current of 16 mA at 25°C.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and integrated output buffer amplifiers.
• Microprocessor-compatible parallel interface with individual latch control via A0-A2 address lines.
• LC2MOS process enabling high-speed operation with 95 ns write pulse compatibility.
• Flexible power supply options supporting both dual (±5 V nominal) and single (15 V) configurations.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Industrial control systems utilizing microprocessor-based architectures.
• Programmable power supplies and waveform generators.

Procurement Notes

Verify the specific suffix 'ABR' against the manufacturer's ordering guide to confirm package type and temperature grade. The 'REEL' designation indicates tape-and-reel packaging. Confirm availability status as distribution channels may list restricted stock levels. Ensure the selected variant matches the required operating temperature range of −40°C to +85°C.

Selection Notes

Select this component when multiple low-cost, medium-resolution DAC channels are required in a compact footprint. The AD7228 is suitable for applications where board space is limited compared to discrete solutions. Consider the 2 kΩ minimum load resistance requirement for the output buffers. Verify that the system's reference voltage source can handle the varying input impedance presented by the DAC array during code transitions.

Part Context

The AD7228 belongs to Analog Devices' LC2MOS family of monolithic DACs. This series is designed to integrate precision analog circuits with high-speed digital logic on a single CMOS substrate. The device serves as a cost-effective alternative to using eight separate single-channel DACs, reducing assembly complexity and improving system reliability through reduced component count.

Replacement Considerations

Direct pin-compatible replacements within the same package style should be verified against the latest datasheet revision. Other members of the AD722x family may offer different resolutions or channel counts but require interface adjustments. Ensure any substitute maintains the 8-bit resolution and parallel interface timing specifications.