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GS4882 の電気的特性と機能

GS4882のメーカーはGennumです、この部品の機能は「Video Sync Separators」です。


製品の詳細 ( Datasheet PDF )

部品番号 GS4882
部品説明 Video Sync Separators
メーカ Gennum
ロゴ Gennum ロゴ 




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GS4882 Datasheet, GS4882 PDF,ピン配置, 機能
GS4882, GS4982 Video Sync Separators with 50% Sync Slicing
Features
• precision 50% sync slicing
• internal color burst filter
• ±5ns temperature stability
• superior noise immunity
• robust signal detection/output muting circuitry
• high performance dual mode input clamp
• 0.5V to 4.0Vpp input signal with +5V supply
• composite, vertical, back porch, odd/even outputs
• horizontal sync output available with GS4982
• +4.5V to +13.2V supply voltage range
• Pb-free and Green
Description
The GS4882 and GS4982 are precision sync separators for
extracting timing information from NTSC, PAL, and SECAM
video signals. The GS4882 generates noise immune and
temperature stable composite sync, vertical sync, back
porch and odd/even field signals. The GS4982 provides a
horizontal sync output for those applications requiring
horizontal sync extraction.
The GS4882 and GS4982 feature an internal color burst
filter for minimization of spurious timing information and
the reduction of external component count. The precision
50% sync slicing feature embodied in the device provides
for superior sync extraction in the presence of noise and
varying sync pulse amplitudes. The high performance dual
mode input clamp aids in maintaining the accuracy of the
internally derived 50% sync slicing level to within ±5% as
well in reducing system start-up/recovery time. In
addition, a missing pulse detector enables the devices to
quickly respond to impulse noise by temporarily turning on
a Nosync Recovery Current connected to the dual mode
input clamp. The input stage will operate with input signal
amplitudes ranging from +0.5 to +4.0V peak to peak with a
+5V supply voltage.
The GS4882 and GS4982 have robust signal detection and
output muting circuitry. Should valid video be removed
from the device input, the absence of video will be
automatically detected and all outputs muted to a logic
high state after a defined probation period. Upon the return
of a valid video signal, device outputs are enabled after
receiving 8 lines of video. An internal frequency to voltage
converter also allows the device to differentiate between
valid and invalid input signals by analyzing the horizontal
scan rate of the input signal and comparing it against the
expected input signal scan rate.
The GS4882 and GS4982 are available in standard 8-pin
PDIP and SOIC packages, operate with a +4.5V to +13.2V
supply voltage range and typically consume less than 6mA
of current with a +5V supply voltage.
COMPOSITE
SYNC OUT
COMPOSITE
VIDEO IN
VERTICAL
SYNC OUT
GROUND
GS4882
18
27
36
45
Vcc
ODD/EVEN
RSET
BACK PORCH
GS4982
HORIZONTAL
COMPOSITE
VIDEO IN
VERTICAL
SYNC OUT
GROUND
1
2
3
4
8
7
6
5
Vcc
ODD/EVEN
RSET
BACK PORCH
Figure A: Pin Connections
GS4882, GS4982 Video Sync Separators with 50% Sync
Slicing
Data Sheet
8505 - 2
November 2009
www.gennum.com
1 of 13
Proprietary & Confidential

1 Page





GS4882 pdf, ピン配列
1. Electrical Characteristics
1.1 Absolute Maximum Ratings
Table 1-1 lists the absolute maximum ratings for the GS4882 and GS4982. Conditions
exceeding the limits listed may cause permanent damage to the device. This is a stress
rating only and functional operation of the device at these or any other conditions above
those listed in the operational sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Table 1-1: Absolute Maximum Ratings
Parameter
Supply Voltage Range
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Sec)
Value
±13.5V
-0°C to 70°C
-65°C to 150°C
260°C
1.2 Electrical Characteristics
Table 1-2 shows the electrical characteristics of the GS4882 and GS4982, where
conditions are VCC = 5V, RSET = 227k, ΤΑ = 25°C, CL = 15pF, unless otherwise specified.
Table 1-2: Electrical Characteristics
POWER
SUPPLIES
VIDEO INPUT
COMPOSITE
SYNC OUTPUT
(GS4882)
BACK PORCH
OUTPUT
Parameter
Supply Voltage
Supply Current
Signal Level
Nosync Recovery Current
Delay to Nosync Recovery
Sync Tip Clamp Voltage
Source Impedance
Color Burst Filter
Sync Slice Level
Delay from Video
Delay from Video
Temperature Stability
Delay
Pulse Width
Conditions
Outputs at Logic 1
VCC = 5V
Attenuation at 3.58MHz
Input Amplitude 0.5 to 2.0Vp-p
TA = 25°C
TA = 0°C to 70°C
From rising edge of sync
Min Typ Max Units
4.5 5.0 13.2 V
– 6 10 mA
0.5 – 4.0 V
23 30 40
70 – 120
– 1.55 –
– – 200
12 15
45 50 55
150 200 250
V
V
V
Ω
dB
%
ns
-5 – +5 ns
400 525 650
2.0 2.5 3.2
ns
μs
GS4882, GS4982 Video Sync Separators with 50% Sync
Slicing
Data Sheet
8505 - 2
November 2009
3 of 13
Proprietary & Confidential


3Pages


GS4882 電子部品, 半導体
0
-5
-15
-25
-35
0.01
0.1 1
FREQUENCY (MHz)
10
Figure 2-1: Frequency Response of Internal Color Burst Filter
2.2 Composite Sync Output (Pin 1 GS4882)
The filtered video signal is then fed to a comparator which compares it to an internally
derived voltage corresponding to the 50% point of the sync pulse amplitude.
By slicing the composite video waveform at 50% of the sync pulse amplitude, variations
in output pulse timing due to variations in input signal amplitude are minimized.
Figure 2-2 demonstrates the stability of output pulse timing achieved with 50% sync
slicing.
With 50% Sync Slicing no Time Base Errors (TBEs) are introduced due to variations in
sync pulse amplitude. Output pulses are always produced at tO+tD , where tD represents
the delay through the device.
A Sync Pulse No.1
A/2 Sync Pulse No.2
50% Slice
50% Slice
to
Time
Figure 2-2: Stability of Output Pulse Timing with Variations in Sync Pulse
Amplitude
The 50% point of sync is determined by using two identical resistors to divide the voltage
between sync tip and back porch. The importance of precision sync tip clamping may be
GS4882, GS4982 Video Sync Separators with 50% Sync
Slicing
Data Sheet
8505 - 2
November 2009
6 of 13
Proprietary & Confidential

6 Page



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