EL4511 查看數據表（PDF） - Intersil

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EL4511

Super Sync Separator

Intersil 

EL4511

Application 2 (application using mode setting

logic signals)

In this example, the requirement is to provide the

synchronizing information in a small display device. In this

example the incoming sync signals may come from one of

three sources. Computer, HDTV Set-top Box or an

NTSC/PAL tuner.

The EL4511 has the advantage that the sync separation is

carried out over a wide frequency range without the need to

adjust "RSET" as required by earlier generations of sync

separators.

As there is no Microcontroller connected in this example,

there is no need for a XTAL at pins 1 & 24. These pins can

be used to force the EL4511 to select the correct operation

(and speed up acquisition).

Note that a Low Pas 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) (See Table 2 for details.)

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

COMPUTER

HDTV

NTSC/PAL

VCC

11 VERTIN

100nF

10 SYNCIN

10kΩ

4 PDWN

1 XTAL

VERTOUT 22

EL4511

HOUT 21

VERTICAL

TIMING

HORIZONTAL

TIMING

10kΩ

24 XTALN

FIGURE 9. APPLICATIONS DRAWING 2

19

FN7009.7

July 21, 2005

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