MC44BC375JDR2 Просмотр технического описания (PDF) - Freescale Semiconductor

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MC44BC375JDR2

PLL Tuned VHF Audio/Video High Integration Modulator ICs

Freescale Semiconductor 

Freescale Semiconductor, Inc.

Device Overview

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.

LOP

3

TVOVCC 14

75Ω

VIDEO

10

Peak

White Clip

Clamp

Video

Modulator

LPF

31.25kHz

Sound

PFD

SPLLFLT

8

MODULATOR

SECTION

Sound

Oscillator

and FM

Modulator

Audio

Ampli

7 AUDIO

6 PREEM

TVOUT 13

Power

save

9

Psave/

LOP

LPF

Sound

Modulator

Prog.

Divider

LPF ALC

PSS

SFS

11 VCCA

5 GND

Snd Freq

Select

- SFS

16

Channel

Select - 1

CHS

Test Mode

Divider

VHF

Divider

UHF

OSC.

VCO & PLL

SECTION

PLL

PS1/2

Select

2

- PSS

12

GND

Prescaler

/8

CHS

Prog.

Divider

Phase 31.25kHz Ref Divider

Comp.

/128

15

PLLFLT

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

4Mhz

XCO

4

XTAL

MOTOROLA

MC44BC375/U/J/T Technical Data

3

For More Information On This Product,

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