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GS4982-CKA Datenblatt(PDF) 5 Page - Gennum Corporation

Teilenummer GS4982-CKA
Bauteilbeschribung  Video Sync Separators with 50% Sync Slicing
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Hersteller  GENNUM [Gennum Corporation]
Direct Link  http://www.gennum.com
Logo GENNUM - Gennum Corporation

GS4982-CKA Datenblatt(HTML) 5 Page - Gennum Corporation

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521 - 61 - 01
ODD / EVEN
OUTPUT
(Pin 7)
VCC
(Pin 8)
RSET
(Pin 6)
VERTICAL SYNC
OUTPUT
(PIN 3)
BACK PORCH
DETECTOR
COMPOSITE
SYNC OUTPUT
(Pin 1)
HORIZONTAL
CLEN
VERTICAL
DETECTOR
INTEGRATED
HOLD
FILTER
BESSEL
2ND ORDER
SIGNAL
DETECT
MUTE
WINDOWING
CIRCUIT
FAULT
HANDLING
CLAMP
WINDOW
+
+
-
-
BACK PORCH
OUTPUT
(Pin 5)
VOLTAGE
REGULATOR
TIMING
CURRENTS
-
+
CLK Q
D
Q
G
Q
Q
D
CLK
D
Q
Q
227k
0.1
µ
VHC
VSC
VSC
+
-
R
50%
POINT
R
INTEGRATED
HOLD
2ND ORDER
BESSEL
FILTER
FAULT
HANDLING
CLAMP
WINDOW
VIDEO
INPUT
(Pin 2)
NO SYNC
BPEN
0.1
µ
Assuming that the sync separator is in steady state operation
with a valid input signal, all outputs will be enabled. Removal
of the input signal, or a significant change in the input signal
frequency, will cause an internal probation timer to be triggered.
While on probation,
the sync separator outputs remain
enabled and separated sync is still produced. If a valid input
signal is not returned to the system before the probation time
expires (typically 2.5 ms), all outputs will be muted to logic
high state. Should a valid signal return during the probation
period, and eight lines be received before the probation time
expires, device outputs will remain enabled. Once device
outputs are muted, the device must receive 8 valid lines of
video at the correct horizontal frequency before the outputs
are re-enabled.
SIGNAL DETECT AND OUTPUT MUTE
Internal to the GS4882 and GS4982 is a robust video signal
detection circuit. This circuit provides a reliable control signal
that will enable the sync separator outputs only when a valid
video signal is present. When the input signal is not valid, the
outputs are muted and stay in a logic high state.
The GS4882 and GS4982 differentiate between valid and in-
valid input signals by feeding the horizontal sync information
into a frequency to voltage converter. The horizontal scan rate
of the input signal is then compared to an expected input
signal horizontal scan rate.
With R
SET
=227 k
Ω, the sync
separator will typically define a valid input signal as one with
a horizontal frequency of 15.7 ± 4 kHz.
Fig. 6
GS4882 Block Diagram
ODD / EVEN
OUTPUT
(Pin 7)
VCC
(Pin 8)
RSET
(Pin 6)
VERTICAL SYNC
OUTPUT
(PIN 3)
BACK PORCH
DETECTOR
HORIZONTAL
(Pin 1)
HORIZONTAL
VERTICAL
DETECTOR
SIGNAL
DETECT
MUTE
+
+
-
-
BACK PORCH
OUTPUT
(Pin 5)
VOLTAGE
REGULATOR
TIMING
CURRENTS
-
-
+
+
CLK Q
D
Q
G
Q
Q
D
CLK
D
Q
Q
227k
0.1
µ
R
50%
POINT
R
2ND ORDER
BESSEL
FILTER
VIDEO
INPUT
(Pin 2)
NO SYNC
0.1
µ
WINDOWING
CIRCUIT
CLAMP
WINDOW
INTEGRATED
HOLD
FAULT
HANDLING
VSC
VHC
VSC
CLEN
BPEN
Fig. 7 GS4982 Block Diagram


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