AD8561AR

Overview

The AD8561AR is a single ultrafast comparator from Analog Devices Inc. housed in an 8-lead narrow SOIC (R-8) surface-mount package. It operates on a single supply voltage ranging from 3 V to 10 V, or dual supplies of ±5 V. The device features a typical propagation delay of 7 ns at 5 V and includes a low-power latch function. It provides complementary digital outputs and supports industrial temperature operation from –40°C to +85°C.

Feature Summary

• Features a 7 ns propagation delay with closely matched rising and falling signal delays for accurate clock recovery.
• Includes a dedicated latch input pin to retain output data states independent of subsequent input changes.
• Offers a wide common-mode input range that extends down to the negative supply rail.

Applications

• High speed timing circuits
• Clock recovery and distribution systems
• Line receivers
• Digital communications phase detectors

Procurement Notes

Verify the specific suffix 'AR' corresponds to the 8-lead narrow SOIC package option R-8. Confirm RoHS compliance status by checking for the 'Z' designation if required, as standard parts may differ. Ensure the operating environment remains within the specified –40°C to +85°C industrial temperature range during deployment.

Selection Notes

Select this component when a fast response time is critical for timing applications. The separate power supply design allows flexibility for both single and dual supply architectures. Consider the input bias current characteristics and source resistance limitations to maintain optimal high-speed performance without introducing excessive delay.

Part Context

This part belongs to the AD8561 family of ultrafast comparators manufactured by Analog Devices. It serves as a direct pin-compatible upgrade for LT1016 designs, offering lower power consumption and faster switching speeds while maintaining similar form factors across DIP, TSSOP, and SOIC packages.

Replacement Considerations

The AD8561 is a pin-compatible replacement for the LT1016. Designers must account for differences in input voltage range, bias current direction, and output swing characteristics when migrating existing LT1016 circuits to this component.

FAQ

How does the AD8561 handle input signals exceeding the common-mode range?

Signals exceeding the upper limit of the common-mode range (typically 3.0 V on a 5 V supply) may result in slower response times. Signals significantly above this limit can increase input currents and further degrade speed.

What are the setup and hold requirements for the latch function?

To ensure data retention, the input signal must be valid for at least 2 ns to 3 ns before the latch pin goes high and remain valid for at least 3 ns after the latch pin goes high.