Device Overview

MC44BC375/U/J/T Technical Data

2 Device Overview

Figure 2 shows a simplified block diagram of the MC44BC375U/J/Tdevice.

The MC44BC375U/J/T device has two main sections:

1. A modulator section which accepts audio and video inputs and modulates the VHF carrier.

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

UHF oscillator, divided for VHF output)

The high frequency BICMOS technology permits integration of tank circuit and certain filtering functions.

Figure 2. MC44BC375/U/J/T Block Diagram

VCO & PLL

SECTION

8

1

2

31.25kHz

6

15

10

4

Channel

Select

-

CHS

PS1/2

Select

-PSS

VIDEO

SPLLFLT

PREEM

PLLFLT

XTAL

MODULATOR

SECTION

4Mhz

XCO

UHF

OSC.

13

LPF

Sound

Modulator

Video

Modulator

LPF

ALC

Sound

Oscillator

and FM

Modulator

Sound

PFD

Audio

Ampli

Prog.

Divider

7 AUDIO

3

LOP

11 VCCA

LPF

12

GND

5 GND

Peak

White Clip

31.25kHz

Clamp

Prog.

Divider

Phase

Comp.

Ref Divider

/128

PLL

75

Ω

9

16

Snd Freq

Select

-SFS

14

VHF

Divider

Test Mode

Divider

SFS

PSS

CHS

Prescaler

/8

TVOUT

Power

save

Psave/

LOP

TVOVCC

Freescale Semiconductor, Inc.

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Go to: www.freescale.com