AD774BBD

Overview

The AD774BBD is a monolithic 12-bit successive-approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It integrates an internal 10 V reference, clock circuitry, and three-state output buffers for direct microprocessor interfacing. The device supports ±12 V/±15 V and +5 V logic supplies, offering conversion times of up to 8 µs. It features industry-standard pinouts compatible with the AD574A and provides calibrated input ranges including 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V.

Feature Summary

• 12-Bit SAR Architecture: Complete monolithic ADC with integrated reference and clock.
• High-Speed Conversion: Maximum conversion time of 8 µs.
• Flexible Interface: Three-state outputs support 8-bit or 12-bit data formats via parallel bus.
• Calibrated Ranges: Factory-trimmed for 0 V–10 V, 0 V–20 V, ±5 V, and ±10 V spans.

Applications

• Industrial process control systems requiring high-speed data acquisition.
• Military instrumentation compliant with MIL-STD-883 standards.
• Data acquisition modules for 8-bit and 16-bit microprocessor buses.

Procurement Notes

Verify the specific grade suffix 'BD' corresponds to the -40°C to +85°C industrial temperature range and hermetically sealed ceramic DIP package. Confirm that the ordering code matches the manufacturer's current documentation, as legacy part numbers may have specific screening requirements or end-of-life statuses.

Selection Notes

Select the AD774BBD over the AD674B variant when faster conversion speeds are required, as the AD774B offers an 8 µs maximum conversion time compared to the AD674B's 15 µs. Ensure the application requires the hermetically sealed ceramic DIP package and operates within the specified -40°C to +85°C temperature range.

Part Context

The AD774BBD belongs to the AD674B/AD774B family of complete 12-bit A/D converters. These devices utilize Analog Devices' BiMOS II process to combine high-performance bipolar analog circuits with digital CMOS logic. They serve as high-speed upgrades to the industry-standard AD574A, offering improved bus access speed and lower power consumption while maintaining pin compatibility.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material.