EL4511 查看數據表（PDF） - Intersil

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EL4511

Super Sync Separator

Intersil 

EL4511

Application 3 (application using a microcontroller

interface)

In this example, the requirement is to provide the

synchronizing information in a video digitizing interface. This

example is very similar to the example in application 2. In

this example the incoming sync signals may come from one

of three sources. Computer, HDTV source or an NTSC/PAL

device.

As there is a Microcontroller connected in this example, a

32.768kHz XTAL is connected to pins 1 & 24; this will allow

the system microcontroller to gather timing information for

the vertical rate. To enable the crystal oscillator, register 9,

bit 6 must be set to a high.

Note that a Low Pass Filter is in the NTSC/PAL signal path to

reduce noise, glitches and subcarrier. (In signals with bad

Croma/Luma gain balance, the subcarrier can extend into

the sync slicing level).

As some of the signals in this application were non standard

formats, the fixed slice mode is used by setting register 2,

bit 5 to a high. Register 1, bit 6 is also set to a high. This

forced the EL4511 to provide outputs even when the input

signals are not recognized by the internal algorithms.

H SYNC

V SYNC

75Ω

HDTV

SYNCS

75Ω

CVBS

75Ω

VIDEO SIGNALS (RGB)

75Ω

VIDEO SIGNALS (HDTV)

COMPONENT

620Ω

510pF

COMPOSITE

VIDEO SIGNAL (CVBS)

+

4.7µF 0.1µF

VCC

VCC

0.1µF

9 HIN

GNDA2 16

11 VERTIN

100nF

10 SYNCIN

4 PDWN

32.768kHz

CRYSTAL

1 XTAL

24 XTALN

VERTOUT 22 VERTICAL

TIMING

EL4511

HOUT 21 HORIZONTAL

TIMING

BACKPORCH 20 VIDEO

CLAMP

VBLANK 2

PLL

COAST

FIGURE 12. APPLICATIONS DRAWING 3

TO MICROCONTROLLER

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24

FN7009.7

July 21, 2005

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