PLL Tuning Circuit with 1.3 GHz Prescaler and D/A Converters for Automatic Tuner Alignment

The MC44864 is a tuning circuit for TV applications. This device contains a PLL section and a DAC section and is MCU controlled through an I2C Bus. The PLL section contains all the functions required to control the VCO of a TV tuner. The IC generates the tuning voltage and the additional control signals, such as band switching voltages.

•Complete Single Chip System for MPU Control

•Selectable ÷8 Prescaler Accepts Frequencies up to 1.3 GHz

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

•Programmable Reference Divider

•3–State Phase/Frequency Comparator

•Operational Amplifier for Direct Varactor Control with Low Saturation Voltage

•Four Output Buffers (15 mA)

•Output Options for 62.5 kHz, Reference Frequency and the Programmable Divider

•The HF Input is Symmetrical

•Three 6 Bit DACs for Automatic Tuner Adjustment Allowing Use of Non–Matched Varactors

•Better Tuner Performances Through Optimum Filter Response

•I2C Bus Controlled

•Four Chip Addresses for the PLL Section

•Four Chip Addresses for the D/A Section

•ESD Protected to MIL–STD–883C, Method 3015.7 (2,000 V, 1.5 kΩ, 150 pF)