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PDF GS4881 Data sheet ( Hoja de datos )
| Número de pieza | GS4881 | |
| Descripción | Monolithic Video Sync Separators | |
| Fabricantes | Gennum | |
| Logotipo |  |
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GS1881, GS4881, GS4981 Monolithic Video Sync Separators
Features
• noise tolerant odd/even flag, back porch and
horizontal sync pulse
• fast recovery from impulse noise
• excellent temperature stability
• 0.5V to 4Vpp input signal amplitude with 5V supply
• well-controlled clamp discharge current and slicing
level
• programmable horizontal scan rate (up to 130kHz)
• composite, vertical, back porch, odd/even (GS1881,
GS4881), horizontal (GS4981) outputs
• predictable vertical output pulse width with default
trigger for non-standard video signals
• Pb-free and Green
• 5V to 12V supply voltage range
• pin compatible with LM1881 sync separator
Application Selection Chart
Application
Direct LM1881 Replacement with
Improved Performance
New Applications Substitution for
LM1881
New Applications Requiring Horizontal
Sync Output
Choose Device:
GS1881
GS4881
GS4981
Description
The GS1881, GS4881 and GS4981 are general purpose sync
separators for use in a wide variety of video applications.
The devices extract the timing information from composite
video signals with scan rates from 15 to 130kHz.
The GS1881 is a drop-in replacement for the industry
standard LM1881 with much improved performance. The
device generates composite sync, vertical sync, back porch
and odd/even field signals. The GS4881 is identical to the
GS1881 but features a noise immune back porch pulse
which maintains a constant H rate during the vertical
interval. The GS4981 is identical to the GS4881, except that
it provides horizontal sync in place of the odd/even output.
All three devices feature a self-adjusting windowing circuit
for noise immunity, which synchronizes to H rate. This
windowing circuit determines the odd or even field in the
GS1881 and GS4881, gates the back porch pulse in the
GS4881 and GS4981, and generates the horizontal sync
output in the GS4981.
The devices feature an improved input stage which ensures
that the input signal is sliced at a predictable point due to
well-controlled input clamp discharge current and sync
slicing level. A missing pulse detector enables the devices
to recover quickly from impulse noise disturbances by
temporarily increasing the clamp discharge current by
roughly ten times. The input stage will operate with signals
from 0.5 to 4Vp-p with a 5V supply.
The GS1881, GS4881 and GS4981 also feature a predictable
vertical output pulse width with a default trigger for
non-standard video signals. All three are available in
commercial and industrial temperature ranges and are
packaged in both DIP and SOIC.
GS1881, GS4881, GS4981 Monolithic Video Sync
Separators
Data Sheet
6926 - 5
November 2009
www.gennum.com
1 of 29
Proprietary & Confidential
1 page  
Table 2-1: GS1881 Electrical Characteristics (Continued)
Parameter
Conditions
Min
Typ
Max
Units
(b) VOL
Ι OL = 1.6mA
– 0.3 0.6 V
NOTES:
1. When placing the RSET resistor and the 0.1μF decoupling capacitor, careful attention should be made to ensure that they are as close as
possible to Pin 6. Care should also be taken to avoid parasitic capacitive coupling from any output pin (Pins 1, 3, 5 and 7) to Pin 6.
2. Measured from slicing point of input falling edge to 50% point of composite sync falling edge.
2.2 GS4881 Electrical Characteristics
Table 2-2 shows the electrical characteristics of the GS4881 where conditions are
VCC = 5V, RSET = 680kΩ, TA =25°C, unless otherwise shown.
Table 2-2: GS4881 Electrical Characteristics
Parameter
Conditions
Supply Voltage
–
Supply Current
Outputs at
Logic 1
VCC = 5V
VCC = 12V
Video Input (Pin 2)
(a) Signal Level
VCC = 5V
(b) Clamp Current
Charge
Discharge - normal
Discharge - Nosync flag raised
(c) Delay to raising of Nosync flag Video input held high
(d) Sync Tip Clamp Voltage
–
Sync Slice Level
Relative to sync tip clamp voltage
RSET Pin Reference Voltage (Pin 6) See Note 1.
Composite Sync Out (Pin 1)
Delay from Video
See Note 2.
CL = 15p
Back Porch Pulse Out (Pin 5)
(a) Delay from Rising Edge of Sync
(b) Pulse Width
CL = 15p
(c) Occurrence Rate
Vertical Sync Out (Pin 3)
(a) Pulse Width
Serrations during vertical interval
(b) Default Starting Time
No serrations during vertical interval
Min
4.5
–
–
0.5
500
9
65
64
–
70
1.14
40
400
2.0
H
197.7
48
Typ
5
4.6
5.0
–
650
11
95
95
1.55
77
1.24
60
500
2.5
H
197.7
65
Max
13.2
30
6.5
4
850
13
115
130
–
84
1.34
80
650
3.2
H
197.7
82
Units
V
mA
mA
Vp-p
μA
μA
μA
μs
V
mV
V
ns
ns
μs
–
μs
μs
GS1881, GS4881, GS4981 Monolithic Video Sync
Separators
Data Sheet
6926 - 5
November 2009
5 of 29
Proprietary & Confidential
5 Page 
3. Temperature Characteristics
Figure 3-1 through Figure 3-6 show the typical temperature characteristics for the
GS1881, GS4881, and GS4981, where VS = 5V, RSET =680kΩ, unless otherwise specified.
NOTE: Grey shading on Figure 3-1 through Figure 3-6 indicates commercial
temperature range (0 to 70°C).
10
8
6
4
2
0
-2
-4
-6
-25 -15 -5
5 15 25 35 45 55 65 75 85
TEMPERATURE (°C)
Figure 3-1: Composite Sync Delay Variation vs Temperature
850
740
650
550
450
350
-25 -15 -5
5 15 25 35 45 55 65 75 85
TEMPERATURE (°C)
Figure 3-2: Clamping Current vs Temperature
GS1881, GS4881, GS4981 Monolithic Video Sync
Separators
Data Sheet
6926 - 5
November 2009
11 of 29
Proprietary & Confidential
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet GS4881.PDF ] | |
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