PLL Tuning Circuits with 3-Wire Bus

The MC44817/17B are tuning circuits for TV and VCR tuner applications. They contain on one chip all the functions required for PLL control of a VCO. The integrated circuits also contain a high frequency prescaler and thus can handle frequencies up to 1.3 GHz.

•Complete Single Chip System for MPU Control (3–Wire Bus). Data and Clock Inputs are IIC Bus Compatible

•Divide–by–8 Prescaler Accepts Frequencies up to 1.3 GHz

•15 Bit Programmable Divider Accepts Input Frequencies up to 165 MHz

•Reference Divider: Programmable for Division Ratios 512 and 1024.

The MC44817B has a Fixed 1024 Reference Divider

•Tri–State Phase/Frequency Comparator

•Operational Amplifier for Direct Tuning Voltage Output (30 V)

•Four Integrated PNP Band Buffers for 40 mA (VCC1to 14.4 V)

•Output Options for the Reference Frequency and the Programmable Divider

•Bus Protocol for 18 or 19 Bit Transmission

•Extra Protocol for 34 Bit for Test and Further Features

•High Sensitivity Preamplifier

•Circuit to Detect Phase Lock

•Fully ESD Protected