AD96685BRZ

Overview

The AD96685BRZ is a single-channel ultrafast voltage comparator from Analog Devices, housed in a 16-pin SOIC package. It operates with +5 V and –5.2 V supplies, consuming 118 mW per comparator. The device features a 2.5 ns propagation delay and 50 ps delay dispersion. Input offset voltage is typically 2 mV at 25°C, with an input bias current of 10 µA. Common-mode rejection ratio is 90 dB, and power supply rejection ratio is 70 dB. It supports industrial temperatures from –25°C to +85°C.

Feature Summary

• Features a fast differential input stage for consistent propagation delay across various signals within a wide common-mode range.
• Outputs are complementary digital signals fully compatible with ECL logic families and provide sufficient drive current for direct transmission line driving.
• Includes a level-sensitive latch input permitting tracking, track-hold, or sample-hold modes of operation.

Applications

• High Speed Triggers
• High Speed Line Receivers
• Threshold Detectors
• Window Comparators
• Peak Detectors

Procurement Notes

Verify the specific ordering suffix BRZ corresponds to the 16-pin SOIC industrial temperature variant (-25°C to +85°C). Confirm that the component matches the REV.D datasheet specifications for propagation delay and power consumption. Ensure compatibility with ECL termination requirements using external pull-down resistors connected to -2.0 V.

Selection Notes

Select this component for applications requiring ultrafast response times and low power consumption in a single-channel configuration. Consider the AD96687BRZ if dual comparators are needed. Ensure the design accommodates the open-emitter output structure requiring external termination resistors. Verify that the operating environment stays within the specified industrial temperature range.

Part Context

The AD96685BRZ belongs to the AD96685/AD96687 family of ultrafast comparators designed by Analog Devices. This series is engineered for high-speed signal processing where timing accuracy is critical. The BRZ suffix indicates a lead-free, RoHS-compliant version in a surface-mount SOIC package, suitable for modern PCB assembly processes.

Replacement Considerations

The AD96687BRZ serves as a dual-channel alternative within the same family. For pin-compatible replacements, verify electrical characteristics against the original datasheet requirements. No other direct substitutes are confirmed in the provided documentation.

FAQ

How should the outputs be terminated?

The outputs are open emitters and require external pull-down resistors, typically 50 Ω to 200 Ω, connected to -2.0 V.

What is the function of the LATCH ENABLE input?

The LATCH ENABLE input allows the comparator to operate in compare, track-hold, or sample-hold modes. Grounding it disables the latching function.