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參數資料
型號: MC44C401FA
廠商: MOTOROLA INC
元件分類: 消費家電
英文描述: MTS Stereo Encoder
中文描述: SPECIALTY CONSUMER CIRCUIT, PQFP32
封裝: PLASTIC, TQFP-32
文件頁數: 10/16頁
文件大小: 426K
代理商: MC44C401FA
10
MC44C401 Technical Data
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
Functional Description
7 Functional Description
The following sections provide brief descriptions of the MC44C401 modules.
7.1 Phase Locked Loop (APLL)
The APLL locks to the reference frequency of 12 MHz and generates the master clock.
Figure 5. APLL and Clock Generator
7.2 Sync Separator
The Sync Separator, shown in Figure 6, extracts the composite sync from the incoming composite
video signal.
The composite sync is used by the Audio Processor to generate the 15.734 kHz pilot tone and the
31.468 kHz carrier to modulate the Left-Right channel. The nominal output level of composite
video signal sources is 1 V
pp
on 75
and the sync amplitude is 0.3 V.
Figure 6. Sync Separator
APLL
Clock
Generator
VCO
Ref Clk
MC44C401
XTALIN
XTALOUT
Oscillator
12MHz
2M
15pF
15pF
384 MHz
÷
CVBS
MC44C401
Audio
Processor
Sync
Separator
CVBS IN
1M
0.1
μ
F
1K
470pF
F
Freescale Semiconductor, Inc.
n
.
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