AD8564AN

Overview

The AD8564AN is a quad 7 ns single-supply comparator manufactured by Analog Devices Inc. It features separate analog and digital power supplies, enabling input stage operation from ±5 V dual supplies or a 5 V single supply while maintaining CMOS/TTL-compatible outputs. The device offers a typical propagation delay of 7 ns (max 9.8 ns) and operates within an industrial temperature range of −40°C to +125°C. It is housed in a 16-lead Plastic Dual In-Line Package (PDIP).

Feature Summary

• Features independent analog and digital power supplies to isolate input stages from output switching noise.
• Provides fast 7 ns propagation delay with matched rising and falling signal delays for accurate timing.
• Delivers TTL/CMOS logic-compatible outputs with wide voltage swing capabilities.
• Supports rail-to-rail differential input common-mode ranges extending to the negative supply rail.

Applications

• High speed timing circuits
• Line receivers
• Data communications systems
• High speed sampling systems

Procurement Notes

Verify the specific package type and temperature rating against the datasheet before procurement. Confirm that the ordering suffix matches the required lead frame and RoHS compliance status. Ensure the component meets the specified industrial operating temperature range for the intended application environment.

Selection Notes

Select this component when high-speed comparison with minimal propagation delay variation is required. The separate power supply design is critical for applications sensitive to digital noise coupling into the analog input stage. Verify that the load requirements do not exceed the specified output current limits to maintain performance integrity.

Part Context

The AD8564 series serves as a high-performance alternative to legacy comparators like the MAX901, offering lower supply currents and improved speed consistency. It belongs to a family of ultra-fast comparers designed for precision timing and data acquisition applications where signal integrity and low latency are paramount.

Replacement Considerations

The AD8564 is pin-compatible with the MAX901. Designers upgrading from MAX901 should verify that the lower supply current and updated electrical specifications align with their existing circuit constraints.

FAQ

How does the AD8564 handle input common-mode voltage?

The AD8564 utilizes a PNP differential input stage that allows the common-mode voltage range to extend all the way from the negative supply rail to within 2.2 V of the positive supply rail.

What is the maximum capacitive load the AD8564 can drive?

Capacitive loads greater than 50 pF may cause ringing on the output waveform. Propagation delay increases significantly with capacitive loads exceeding 100 pF.