MC44864 Datasheet (Motorola) - PLL TUNING CIRCUIT

MC44864, PLL TUNING CIRCUIT

Pin 6, 7, 8 9 10, 11 12, 20 13 14, 15, 16, 17 18 19 1 2 3 4 5 Symbol DA1, DA2, DA3 VCC1 HF1, HF2 Gnd CA B1, B3, B5, B7 SCL SDA XTAL PHO Amp In VCC2 VTUN D/A output control voltages Positive supply of the circuit (except DACs) HF input from local oscillator Ground Chip Address Band buffer output can

Order this document by MC44864/D Advance Information 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.

The D/A section

MC44864 Features

* and function of the internal blocks is given below. Automatic Tuner Alignment The circuit generates the tuning voltage through the PLL. The output voltages of the D/A converters are equal to the tuning voltage plus a positive or negative offset of up to 31 steps. During the automatic alignment one f