MC44864 Datasheet PLL TUNING CIRCUIT

Manufacturer: Motorola Semiconductor (now NXP Semiconductors)

MC44864 pll tuning circuit by Motorola Semiconductor (now NXP Semiconductors) - Datasheet Preview

Datasheet Details

Part number	MC44864
Manufacturer	Motorola Semiconductor (now NXP Semiconductors)
File Size	203.86 KB
Description	PLL TUNING CIRCUIT
Download	MC44864 Download (PDF)

Overview

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.

Key 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 first lets the PLL lock to the appropriate frequency and then searches for the optimum value of the other varactor voltages. The digital word for each voltage value is stored in a nonvolatile memory (N.

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