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MC44BS373CAD 데이터시트(PDF) 3 Page - Freescale Semiconductor, Inc

부품명 MC44BS373CAD
상세설명  CMOS Audio/Video RF Modulators
PDF  28 Pages
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제조업체  FREESCALE [Freescale Semiconductor, Inc]
홈페이지  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC44BS373CAD 데이터시트(HTML) 3 Page - Freescale Semiconductor, Inc

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Digital Home
Freescale Semiconductor
3
MC44CC373
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.
Figure 2. MC44CC373/374 Simplified Block Diagram
3
12
11
8
7
5
6
9
14
16
1
2
4
10
13
15
Clamp
Sound
PFD
Program
Divider
Audio
Amplifier
L/BG
LPF
ALC
Peak
White Clip
FM
L/BG
AM
31.25/62.5
kHz
31.25 kHz
AM Modulator
UHF OSC
(2 x Fo)
Prescaler
÷8
Ref Divider
÷
128
VHF Dividers
Program
Divider
÷N11:N0
Phase
Comp.
Sound
Oscillator
and FM
Modulator
High Speed
I2C Bus
Receiver
GND
MODULATOR
SECTION
VCO and PLL SECTION
BUS SECTION
AUXIN
VCC
AUDIOIN
PREEM
VIDEOIN
SPLLFLT
VCC
RFOUT
LOP
SCL
SDA
GND
PLLFLT
XTAL
(4 MHz)
NO
CONNECT
XO Prescaler
÷1, 2 or 4
÷2
RF Sound
Modulator
Video
Modulator
XCO



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