MC44BC374C 데이터 시트보기 (PDF) - Freescale Semiconductor

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MC44BC374C

PLL Tuned UHF and VHF Audio/Video High Integration Modulator

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Device Overview

2 Device Overview

Figure 2 shows a simplified block diagram of the MC44BC373C/4C device.

The MC44BC373C/4C device has three main sections:

1. A high speed I2C-compatible bus section

2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated

UHF oscillator, divided for VHF output)

3. A modulator section, which accepts audio and video inputs, then uses them to modulate the

UHF/VHF carrier

An on-chip video test pattern generator with an audio test signal is included.

The MC44BC373C operates as a multi-standard modulator and can handle the following systems using the

same external circuit components: B/G, I, D/K, L, M/N.

High frequency BiCMOS technology allows integration of the UHF tank circuit and certain filtering

functions.

LOP

3

75Ω

TVOVCC 13

TVOUT 12

VIDEO SPLLFLT

9

8

I2C BUS

Video

Modulator

LPF

Peak

White

Clip

Clamp

L / BG

31.25

kHz

Sound

PFD

MODULATOR

SECTION

Sound

Oscillator

and FM

Modulator

Audio

Amplifier

7 AUDIO

6 PREEM

LPF

Sound

Modulator

Prog

Divider

LPF ALC

FM

L / BG

AM

AM Modulator

10 VCCA

11 GND

5 GND

SCL 1

SDA 2

BUS SECTION

VHF Dividers

VCO and PLL SECTION

High Speed

I2C Bus

Receiver

15

16

VCCD GNDD

UHF OSC

Prescaler / 8

I2C BUS

Prog

Divider

PLL

Phase

Comp

Ref Divider

/ 128

31.25KHz

14

PLLFLT

4MHz

XCO

4

XTAL

Figure 2. MC44BC373C/4C Simplified Block Diagram

MC44BC373C/374C Technical Data

For More Information On This Product,

Go to: www.freescale.com

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