el4511 Intersil Corporation, el4511 Datasheet - Page 24

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

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
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H SYNC
V SYNC
SYNCS
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HDTV
CVBS
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75Ω
24
75Ω
75Ω
FIGURE 12. APPLICATIONS DRAWING 3
4.7µF
620Ω
32.768kHz
CRYSTAL
75Ω
510pF
VIDEO SIGNALS (RGB)
VIDEO SIGNALS (HDTV)
VIDEO SIGNAL (CVBS)
0.1µF
+
100nF
EL4511
COMPONENT
COMPOSITE
10
24
11
9
4
1
HIN
VERTIN
SYNCIN
PDWN
XTAL
XTALN
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.
EL4511
V
CC
BACKPORCH
VERTOUT
VBLANK
GNDA2
HOUT
16
22
21
20
2
VERTICAL
TIMING
HORIZONTAL
TIMING
VIDEO
CLAMP
PLL
COAST
TO MICROCONTROLLER
0.1µF
V
CC
July 21, 2005
FN7009.7