AD96687BRZ-REEL

Overview

The AD96687BRZ-REEL is a dual ultrafast voltage comparator from Analog Devices, housed in a 16-pin SOIC package. It operates within an industrial temperature range of -25°C to +85°C and requires +5.0 V and -5.2 V power supplies. The device features a propagation delay of 3.5 ns maximum and 50 ps dispersion. It includes complementary open-emitter outputs compatible with ECL logic families and supports level-sensitive latch inputs for track-hold or sample-hold modes.

Feature Summary

• Dual-channel architecture providing two independent high-speed comparators in a single package.
• Ultrafast switching performance with low propagation delay dispersion for consistent timing accuracy across varying overdrive conditions.
• Integrated level-sensitive latch functionality enabling flexible operation in tracking, track-hold, or sample-hold modes.
• Complementary digital outputs designed to directly drive transmission lines terminated to negative supply voltages.

Applications

• High speed triggers
• Threshold detectors
• Window comparators

Procurement Notes

Verify the specific REEL suffix indicates tape-and-reel packaging rather than tube packaging when sourcing components. Confirm the BRZ designation corresponds to the lead-free industrial grade variant. Ensure compatibility with existing 16-pin SOIC footprints and validate that the dual-channel configuration meets the design requirements compared to single-channel alternatives.

Selection Notes

Select this component when dual-channel high-speed comparison is required within a compact surface-mount footprint. The device is suitable for designs needing precise timing consistency due to its low dispersion characteristics. Consider the specific power supply requirements of +5V and -5.2V during circuit planning. Evaluate the need for latch functionality versus continuous tracking to optimize signal integrity in high-frequency applications.

Part Context

This part belongs to the AD96685/AD96687 family of ultrafast comparators manufactured by Analog Devices. While the AD96685 offers a single channel, the AD96687 provides dual channels with identical electrical specifications. The BRZ-REEL variant specifically denotes the industrial temperature range version packaged in a reel format for automated assembly processes.

Replacement Considerations

The AD96685BRZ serves as a single-channel alternative within the same family. Other variants such as AD96687BQ (DIP) or AD96687BP (PLCC) offer different package options but share identical electrical performance characteristics.

FAQ

How does the AD96687 handle unused comparator channels?

Unused inputs should not be left floating to prevent oscillation caused by high internal gain. The recommended practice is to ensure the inputs are at least one diode drop apart while grounding the LATCH ENABLE input.

What is the function of the LATCH ENABLE input?

The LATCH ENABLE input controls the operating mode. A logic HIGH places the device in compare mode where outputs track inputs, while a logic LOW activates the latch mode, freezing the output state based on the input condition prior to latching.