MC44C401FA MOTOROLA [Motorola, Inc], MC44C401FA Datasheet - Page 10

• Manufacturer Part Number: MC44C401FA
• Description: MTS Stereo Encoder
• Manufacturer: MOTOROLA [Motorola, Inc]

Freescale Semiconductor, Inc.
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.
MC44C401
Clock
384 MHz
APLL
Generator
VCO
Ref Clk
Oscillator
XTALIN
XTALOUT
12MHz
2M
15pF
15pF
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
on 75
and the sync amplitude is 0.3 V.
pp
MC44C401
CVBS IN
CVBS
Audio
Sync Separator
Processor
1K
0.1 F
1M
470pF
Figure 6. Sync Separator
10
MC44C401 Technical Data
MOTOROLA
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