DESCRIPTION
The NE/SE564 is a versatile, high guaranteed frequency phase-locked loop designed for operation up to 50MHz. As shown in the Block Diagram, the NE/SE564 consists of a VCO, limiter, phase comparator, and post detection processor.

FEATURES
•Operation with single 5V supply
•TTL-compatible inputs and outputs
•Guaranteed operation to 50MHz
•External loop gain control
•Reduced carrier feedthrough
•No elaborate filtering needed in FSK applications
•Can be used as a modulator
•Variable loop gain (externally controlled)

APPLICATIONS
•High speed modems
•FSK receivers and transmitters
•Frequency Synthesizers