參數(shù)資料
型號(hào)： MC44BS374T1EF
廠商： Freescale Semiconductor
文件頁數(shù)： 29/34頁
文件大?。?/td> 0K
描述： IC AUDIO/VIDEO MODULATOR 16-SOIC
標(biāo)準(zhǔn)包裝： 48
類型： NTSC/PAL 調(diào)制器
應(yīng)用： 音頻/視頻，VCR，機(jī)頂盒
安裝類型： 表面貼裝
封裝/外殼： 16-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SOIC N
包裝： 管件
MC44BS374T1/374T1A Advance Information
Functional Overview
4 Functional Overview
Figure 2 shows a simplified block diagram of the MC44BS374T1/374T1A device.
The MC44BS374T1/374T1A device has three main sections:
1. A high speed I2C-compatible bus section
2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated
UHF oscillator, divided for VHF output)
3. 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 MC44BS374T1/374T1A operates as a multi-standard modulator and can handle the following systems
using the same external circuit components: B/G, I, D/K, M/N.
High frequency BiCMOS technology allows integration of the UHF tank circuit and certain filtering
functions.
Figure 2. MC44BS374T1/374T1A Simplified Block Diagram
8
13
1
2
6
11
14
9
4
12
7
3
10
15
16
TVOVCC
TVOUT
LOP
VIDEO
SPLLFLT
AUDIO
VCCA
GND
PREEM
XTAL
PLLFLT
GNDD
VCCD
SCL
SDA
BUS SECTION
VCO and PLL SECTION
MODULATOR
SECTION
Clamp
Peak
White
31.25KHz
4MHz
XCO
Ref Divider
/128
Phase
Comp
PLL
Prog
Divider
Prescaler/8
VHF Dividers
Video
Modulator
LPF
RF Sound
Modulator
ALC
LPF
Prog
Divider
Audio
Amplifier
Sound
Oscillator
and FM
Modulator
Sound
PFD
High Speed
I2C Bus
Receiver
UHF OSC
I 2
C
BU
S
I 2
C
BU
S
I2C BUS
I 2
C
BUS
75
5
GND
Clip
31.25
kHz
FM
F
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S
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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