參數(shù)資料
型號(hào): MC44BC375UEF
廠商: Freescale Semiconductor
文件頁數(shù): 14/20頁
文件大小: 0K
描述: IC A-VHF MODULATOR 16-SOIC
標(biāo)準(zhǔn)包裝: 48
類型: 調(diào)制器
應(yīng)用: 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
Device Overview
MC44BC375/U/J/T Technical Data
2 Device Overview
Figure 2 shows a simplified block diagram of the MC44BC375U/J/Tdevice.
The MC44BC375U/J/T device has two main sections:
1. A modulator section which accepts audio and video inputs and modulates the VHF carrier.
2. A PLL section to synthesize the UHF/VHF output channel frequency (from an integrated
UHF oscillator, divided for VHF output)
The high frequency BICMOS technology permits integration of tank circuit and certain filtering functions.
Figure 2. MC44BC375/U/J/T Block Diagram
VCO & PLL
SECTION
8
1
2
31.25kHz
6
15
10
4
Channel
Select
-
CHS
PS1/2
Select
-PSS
VIDEO
SPLLFLT
PREEM
PLLFLT
XTAL
MODULATOR
SECTION
4Mhz
XCO
UHF
OSC.
13
LPF
Sound
Modulator
Video
Modulator
LPF
ALC
Sound
Oscillator
and FM
Modulator
Sound
PFD
Audio
Ampli
Prog.
Divider
7 AUDIO
3
LOP
11 VCCA
LPF
12
GND
5 GND
Peak
White Clip
31.25kHz
Clamp
Prog.
Divider
Phase
Comp.
Ref Divider
/128
PLL
75
9
16
Snd Freq
Select
-SFS
14
VHF
Divider
Test Mode
Divider
SFS
PSS
CHS
Prescaler
/8
TVOUT
Power
save
Psave/
LOP
TVOVCC
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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