Device Overview

MC44BC373C/374C Technical Data

2 Device Overview

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

The MC44BC373C/4C device has three main sections:

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.

Figure 2. MC44BC373C/4C Simplified Block Diagram

8

13

1

2

6

11

14

9

4

12

7

3

10

15

16

TVOVCC

TVOUT

LOP

VIDEO

SPLLFLT

AUDIO

VCCA

GND

PREEM

XTAL

PLLFLT

GNDD

VCCD

SCL

SDA

BUS SECTION

VCO and PLL SECTION

MODULATOR

SECTION

Clamp

Peak

White

L/BG

31.25

31.25KHz

4MHz

XCO

Ref Divider

/128

Phase

Comp

PLL

Prog

Divider

Prescaler /8

VHF Dividers

Video

Modulator

LPF

LPF

Sound

Modulator

L/BG

FM

AM

ALC

LPF

Prog

Divider

AM Modulator

Audio

Amplifier

Sound

Oscillator

and FM

Modulator

Sound

PFD

kHz

High Speed

Receiver

UHF OSC

75

Ω

5

GND

Clip

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com