mc44bc373c Freescale Semiconductor, Inc, mc44bc373c Datasheet - Page 3

• Manufacturer Part Number: mc44bc373c
• Description: Pll Tuned Uhf And Vhf Audio/video High Integration Modulator
• Manufacturer: Freescale Semiconductor, Inc

2 Device Overview
Figure 2 shows a simplified block diagram of the MC44BC373C/4C device.
The MC44BC373C/4C device has three main sections:
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.
TVOVCC
TVOUT
1. A high speed I
2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated
3. A modulator section, which accepts audio and video inputs, then uses them to modulate the
SDA
SCL
UHF oscillator, divided for VHF output)
UHF/VHF carrier
13
12
1
2
VCCD
BUS SECTION
15
High Speed
75Ω
Receiver
LOP
I
2
3
C Bus
GNDD
2
C-compatible bus section
16
Figure 2. MC44BC373C/4C Simplified Block Diagram
Freescale Semiconductor, Inc.
For More Information On This Product,
MC44BC373C/374C Technical Data
I
2
C BUS
Prescaler/8
I
2
C BUS
Go to: www.freescale.com
Modulator
Modulator
LPF
LPF
Sound
Video
VHF Dividers
UHF OSC
L /BG
White
Peak
Divider
Clip
Prog
FM
AM
31.25
kHz
Divider
Sound
PFD
Prog
VIDEO
Clamp
L/BG
PLLFLT
9
Phase
Comp
PLL
14
31.25KHz
LPF
Modulator
SPLLFLT
Oscillator
AM Modulator
and FM
Sound
VCO and PLL SECTION
8
Ref Divider
ALC
/128
MODULATOR
SECTION
Amplifier
Audio
4MHz
XTAL
XCO
Device Overview
4
10
11
5
6
7
GND
AUDIO
PREEM
VCCA
GND