MC44C401L datasheet(9/12 Pages) FREESCALE

9 / 12 page

MTS Stereo Encoder, Rev. 0.5

Freescale Semiconductor

PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE

Functional Description

The following sections provide brief descriptions of the MC44C401L modules.

7.1 Phase Locked Loop (APLL)

The APLL, shown in Figure 5, 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 Vpp on 75 Ω

and the sync amplitude is 0.3 V.

Figure 6. Sync Separator

Clock

Generator

APLL

MC44C401L

384 MHz

Oscillator

12MHz

Ref Clk

VCO

XTALOUT

XTALIN

22pF

Audio

Processor

Sync

Separator

MC44C401L

470pF

0.1µF

CVBS IN

CVBS

MC44C401L Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc