MC44CC373CA Просмотр технического описания (PDF) - Freescale Semiconductor

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MC44CC373CA

CMOS Audio/Video RF Modulators

Freescale Semiconductor 

FUNCTIONAL OVERVIEW

Figure 2 shows a simplified block diagram of the

MC44CC373CA and MC44CC374CA modulators.

There are three main sections:

1. A high speed I2C-compatible bus section for control and

programming.

2. A PLL section to synthesize the UHF output channel

frequency.

3. A modulator section, which accepts audio and video

inputs and modulates the RF carrier

An on-chip simple video test pattern generator with an au-

dio test signal is included, but is not shown in the block dia-

gram.

The MC44CC373/4CA operates as a multi-standard mod-

ulator and can handle the following systems using the same

external circuit components: B/G, I, D/K, L, M/N.

The different orderable part numbers provide: a choice in

the pre-programmed power-up default channel frequency,

the output power level and a pre-programmed secondary I2C

address.

VCC 12

RFOUT 11

LOP 3

BUS SECTION

SCL 16

SDA 1

High Speed

I2C Bus

Receiver

2

GND

VIDEOIN

8

SPLLFLT

7

Video

Modulator

Peak

White Clip

Clamp

L/BG 31.25/62.5

kHz

Sound

PFD

MODULATOR

SECTION

Sound

Oscillator

and FM

Modulator

Audio

Amplifier

Program

Divider

LPF ALC

6 AUDIOIN

5 PREEM

9 VCC

RF Sound

Modulator

FM

L/BG

AM

AM Modulator

VHF Dividers

÷2

Prescaler ÷8

Program

Divider

÷N11:N0

VCO and PLL SECTION

UHF OSC

(2 x Fo)

XO Prescaler

÷1, 2 or 4

Phase

Comp.

Ref Divider

÷128

XCO

31.25 kHz

10 GND

15 AUXIN

13 NO

CONNECT

14

PLLFLT

4

XTAL

(4 MHz)

Figure 2. MC44CC373/374 Simplified Block Diagram

Digital Home

Freescale Semiconductor

MC44CC373

3

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