AD96685BR

Overview

The AD96685BR is a single 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. The device features a propagation delay of 2.5 ns typical and 3.5 ns maximum, with a dispersion of 50 ps. It requires dual power supplies of +5.0 V and -5.2 V, drawing 9 mA and 18 mA respectively. Outputs are complementary open-emitter ECL compatible signals.

Feature Summary

• Ultrafast differential input stage provides consistent propagation delay across a wide common-mode range.
• Integrated latch enable input supports track-hold or sample-hold operational modes.
• Complementary digital outputs are fully compatible with ECL 10K and 10KH logic families.
• Low propagation delay dispersion ensures high timing accuracy under varying overdrive conditions.

Applications

• High speed triggers
• Threshold detectors
• Window comparators
• Peak detectors

Procurement Notes

Verify the specific suffix 'BR' corresponds to the 16-pin SOIC industrial grade variant when sourcing. Confirm that the design utilizes appropriate ECL termination resistors (typically 50 Ω to -2.0 V) for the open-emitter outputs. Ensure power supply decoupling meets the datasheet requirements using ceramic and mica capacitors to maintain signal integrity at these speeds.

Selection Notes

Select this component when a single-channel ultrafast comparator is required with low propagation delay dispersion. It is suitable for applications needing direct drive capability for transmission lines without additional buffering. Consider the AD96687BR if dual independent channels are needed within the same package footprint and performance profile.

Part Context

This part belongs to the AD96685/AD96687 family of ultrafast comparators manufactured by Analog Devices. The series is designed for high-speed signal processing where precise timing and minimal delay variation are critical. The BR suffix specifically denotes the surface-mount SOIC package option for the single-channel configuration.

Replacement Considerations

The AD96687BR serves as a dual-channel alternative within the same package and electrical specification family.

FAQ

How should the unused inputs be handled if only one channel of the AD96687 is used?

Inputs must not float; they should be held at least one diode drop apart, and the Latch Enable input should be grounded to prevent oscillation.

What is the recommended termination for the open-emitter outputs?

Outputs should be terminated through 50 Ω resistors to -2.0 V or equivalent ECL termination to ensure proper transition times.