UC3635

UC1635 UC2635 UC3635 Phase Locked Frequency Controller FEATURES Precision Phase Locked Frequency Control System Crystal Oscillator Programmable Reference Frequency Dividers DESCRIPTION The UC1635 family of integrated circuits was designed for use in precision speed control of DC motors. An extension to the UC1633 line of phase locked controllers, these devices provide access to both of the digital phase detector’s inputs, and include a reference frequency divider output pin. With this added flexibility, this family of controllers can be used to obtain phase synchronization of multiple motors. Phase Detector with Absolute Frequency A reference frequency can be generated using the device’s crystal oscilSteering lator and programmable dividers. The oscillator operates using a broad Separate Divider Outputs and Phase range of crystals, or, can function as a buffer stage to an external freDetector Input Pins quency source. Double Edge Option on the Frequency The phase detector responds proportionally to the phase error between Feedback Sensing Amplifier the detector’s minus input pin and the sense amplifier output. This Two High Current Op Amps phase detector includes absolute frequency steering to provide maximum drive signals when any frequency error exists. This feature allows 5V Reference Output optimum start-up and lock times to be realized. Two op-amps are included that can be configured to provide necessary loop filtering. The outputs of these op-amps wil...