MC44BS373CA 查看數據表（PDF） - Freescale Semiconductor

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MC44BS373CA

PLL-Tuned UHF and VHF Audio/Video High-Integration Modulator

Freescale Semiconductor 

MC44BS373CA Functional Overview

4 MC44BS373CA Functional Overview

Figure 2 shows a simplified block diagram of the MC44BS373CA.

LOP

TVOVCC

TVOUT

75 Ω

CAS

BUS SECTION

(only in QFN 20)

SCL

SDA

High Speed

I2C Bus

Receiver

VCCD GNDD

VIDEO SPLLFLT

I2C BUS

Peak

White

Clip

Clamp

L / BG

Video

Modulator

31.25/62.5

kHz

Sound

LPF

PFD

MODULATOR

SECTION

Sound

Oscillator

and FM

Modulator

Audio

Amplifier

AUDIO

PREEM

Prog

Divider

LPF ALC

LPF

VCCA

GND

RF Sound

Modulator

FM

L / BG

AM

AM Modulator

VHF Dividers

VCO and PLL SECTION

GND

AUXIN

(only in QFN 20)

UHF OSC

PLL

Prescaler / 8

I2C BUS

Prog

Divider

Phase

Comp

Ref Divider

/ 128

31.25 kHz

PLLFLT

4-MHz

XCO

XTAL

Figure 2. MC44BS373CA Simplified Block Diagram

The MC44BS373CA device has three main sections:

• A high-speed I2C-compatible bus section

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

oscillator, divided for VHF output)

• 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 MC44BS373CA 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.

MC44BS373CA Data Sheet

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