STMicroelectronics

Description

List of Figures. 1 PLL Block Diagram. 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 CD4046B PLL Block Diagram. 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 CD4046B PLL Phase Comparator Section Schematic. 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 as a control error, producing a spurious response in the system. PLL speed control systems are used in video recorders, floppy and hard disk drives and in a number of industrial drive systems. Figure 27 shows a typical PLL speed control circuit. The frequency comparator is phase comparator 2 of the HCF4046 CMOS PLL current half-H drivers. The L293 is designed to. Separate Input-Logic Supply provide bidirectional drive currents of up to 1 A at. Internal ESD Protection voltages from 4.5 V to 36 V. The L293D is designed to provide bidirectional drive currents of up to 600-mA. High-Noise-Immunity Inputs at voltages from 4.5 V to 36 V.