MC44BC374T1 データシートの表示（PDF） - Motorola => Freescale

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MC44BC374T1

PLL Tuned UHF and VHF Audio/Video High Integration Modulator

Motorola => Freescale 

Device Overview

2 Device Overview

Figure 2 shows a simplified block diagram of the MC44BC374T1device.

The MC44BC374T1 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 modulates

the UHF/VHF carrier

An on-chip video test pattern generator with an audio test signal is included. The MC44BC374T1 is

designed to operate as a B/G standard modulator. High frequency BiCMOS technology allows integration

of the UHF tank circuit and certain filtering functions.

STBY

3

TVOVCC

75Ω

13

12

TVOUT

I2C BUS

Video

Modulator

LPF

VIDEO SPLLFLT

9

8

Peak

White

Clip

Clamp

MODULATOR

SECTION

31.25

kHz

Sound

PFD

Sound

Oscillator

and FM

Modulator

Audio

Amplifier

7 AUDIO

6 PREEM

LPF

Sound

Modulator

Prog

Divider

LPF ALC

FM

10 VCCA

11 GND

5 GND

BUS SECTION

SCL 1

SDA 2

High Speed

I2C Bus

Receiver

15

16

VCCD GNDD

VHF Dividers

UHF OSC

VCO and PLL SECTION

PLL

Prescaler/8

I2C BUS

Prog

Divider

Phase

Comp

Ref Divider

/128

31.25KHz

14

PLLFLT

4MHz

XCO

4

XTAL

Figure 2. MC44BC374T1 Simplified Block Diagram

MOTOROLA

MC44BC374T1 Technical Data

3

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