el4511 Intersil Corporation, el4511 Datasheet - Page 19

• Manufacturer Part Number: el4511
• Description: Super Sync Separator
• Manufacturer: Intersil Corporation

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
H SYNC
V SYNC
V
SYNCS
CC
CVBS
HDTV
19
COMPUTER
NTSC/PAL
HDTV
75Ω
75Ω
75Ω
FIGURE 9. APPLICATIONS DRAWING 2
4.7µF
620Ω
75Ω
10kΩ
10kΩ
EL4511
510pF
VIDEO SIGNALS (RGB)
VIDEO SIGNALS (HDTV)
VIDEO SIGNAL (CVBS)
0.1µF
+
100nF
adjust "R
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.)
COMPONENT
COMPOSITE
11
10
24
9
4
1
HIN
VERTIN
SYNCIN
PDWN
XTAL
XTALN
SET
" as required by earlier generations of sync
EL4511
V
CC
VERTOUT
GNDA2
HOUT
16
22
21
VERTICAL
TIMING
HORIZONTAL
TIMING
0.1µF
V
CC
July 21, 2005
FN7009.7