UC1635

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 igital phase detector's inputs, and include a reference frequency divi er utput pin. With this added flexibility, this family of controllers can e used to obtain phase synchronization of multiple motors.

reference frequency can be generated using the device's crystal oscillator nd programmable dividers. The oscillator operates using a broad ange of crystals, or, can function as a buffer stage to an external frequency ource.

The phase detector responds proportionally to the phase error between he detector's minus input pin and the sense amplifier output. This hase detector includes absolute frequency steering to provide maximum rive signals when any frequency error exists. This feature allows ptimum start-up and lock times to be realized.

Two op-amps are included that can be configured to provide necessary oop filtering. The outputs of these op-amps will source or sink in excess f 16mA, so they can provide a low impedance control signal to driving ircuits.

Additional features include a double edge option on the sense amplifier hat can be used to double the loop reference frequency for increased oop bandwidths. A 5V reference output can be used to accurately set C operating levels.