AD8611AR

Overview

The AD8611AR is a single-channel ultrafast comparator manufactured by Analog Devices Inc. in an 8-lead narrow body SOIC package. It operates on a single supply voltage ranging from 3 V to 5 V. The device features a typical propagation delay of 4 ns at 5 V, with a maximum specified delay of 5.5 ns. It includes a latch function that requires a supply voltage greater than 4.3 V to operate. The input common-mode range extends down to the negative supply rail. Key electrical parameters include a maximum offset voltage of 7 mV and a maximum input bias current of 6 µA.

Feature Summary

• Ultrafast propagation delay suitable for high-speed timing circuits
• Integrated latch function for maintaining constant output states
• Complementary digital outputs for flexible logic interfacing
• Input common-mode range includes the negative supply rail

Applications

• High speed timing circuits
• Clock recovery and clock distribution systems
• Line receivers
• Digital communications phase detectors
• High speed analog-to-digital converter (ADC) read channel detection

Procurement Notes

Verify the specific ordering suffix 'AR' corresponds to the 8-lead narrow body SOIC package configuration. Confirm the component meets industrial temperature specifications (-40°C to +85°C). Ensure the design accounts for the latch functionality requirement, which is inactive below 4.3 V supply voltage. Check datasheet revisions for any updates to absolute maximum ratings or thermal resistance values before finalizing procurement.

Selection Notes

Select this component when upgrading LT1016 or LT1394 designs due to lower power consumption and faster propagation delay. Consider the wider common-mode input range compared to legacy comparators. Ensure source impedance remains below 1 kΩ to maintain optimal high-speed performance. Verify that the required latch operation aligns with the system's supply voltage constraints.

Part Context

The AD8611 is part of the AD8611/AD8612 family of ultrafast single-supply comparators. The AD8611 represents the single-channel version, while the AD8612 provides dual channels in a 14-lead TSSOP package. Both devices share identical pinouts with older LT1016 and LT1394 models, facilitating direct replacements in existing hardware designs requiring improved speed and efficiency.

Replacement Considerations

The AD8611 is a pin-for-pin compatible replacement for the LT1016 and LT1394. Designers should account for differences in input bias current direction and magnitude, as well as variations in input common-mode voltage ranges and output voltage swing characteristics compared to these legacy parts.