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PDF EL1881C Data sheet ( Hoja de datos )
| Número de pieza | EL1881C | |
| Descripción | Sync Separator/ Low Power | |
| Fabricantes | Elantec | |
| Logotipo |  |
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EL1881C
Sync Separator, Low Power
Features
• NTSC, PAL, SECAM, non-
standard video sync separation
• Fixed 70mV slicing of video input
levels from 0.5VP-P to 2VP-P
• Low supply current - 1.5mA typ.
• Single +5V supply
• Composite, vertical sync output
• Odd/even field output
• Burst/back porch output
• Available in 8-pin PDIP and SO
packages
Applications
• Video amplifiers
• PCMCIA applications
• A/D drivers
• Line drivers
• Portable computers
• High-speed communications
• RGB applications
• Broadcast equipment
• Active filtering
General Description
The EL1881C video sync separator is manufactured using Elantec’s
high performance analog CMOS process. This device extracts sync
timing information from both standard and non-standard video input.
It provides composite sync, vertical sync, burst/back porch timing, and
odd/even field detection. Fixed 70mV sync tip slicing provides sync
edge detection when the video input level is between 0.5VP-P and -
2VP-P (sync tip amplitude 143mV to 572mV). A single external resis-
tor sets all internal timing to adjust for various video standards. The
composite sync output follows video in sync pulses and a vertical sync
pulse is output on the rising edge of the first vertical serration follow-
ing the vertical pre-equalizing string. For non-standard vertical inputs,
a default vertical pulse is output when the vertical signal stays low for
longer than the vertical sync default delay time. The odd/even output
indicates field polarity detected during the vertical blanking interval.
The EL1881C is plug-in compatible with the industry-standard
LM1881 and can be substituted for that part in 5V applications with
lower required supply current.
The EL1881C is available in the 8-pin PDIP and SO packages and is
specified for operation over the full -40°C to +85°C temperature
range.
Connection Diagram
Ordering Information
Part No.
EL1881CN
EL1881CS
EL1881CS-T7
EL1881CS-T13
Package
8-Pin PDIP
8-Pin SO
8-Pin SO
8-Pin SO
Tape & Reel
-
-
7”
13”
Outline #
MDP0031
MDP0027
MDP0027
MDP0027
Demo Board
A dedicated demo board is available.
Composite Sync Out 1
Composite Video In 2
Vertical Sync Out 3
GND 4
8 VDD 5V
7 Odd/Even Output
6 RSET
5 Burst/Back Porch Output
Note: All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication; however, this data sheet cannot be a “controlled document”. Current revisions, if any, to these
specifications are maintained at the factory and are available upon your request. We recommend checking the revision level before finalization of your design documentation.
© 2001 Elantec Semiconductor, Inc.
1 page  
EL1881C
Sync Separator, Low Power
Typical Performance Curves
Burst/Back Porch Width vs RSET
VDD=5V, TA=25°C
6
5
4
3
2
1
200 400 600 800 1000
RSET (kΩ)
Vertical Sync Width vs RSET
VDD=5V, TA=25°C
350
300
250
200
150
100
50
0
200 400 600
RSET (kΩ)
800
1000
Composite Sync Prop Delay vs Temperature
41
39
37
35
33
31
-50 -25
0 25 50
Temperature (°C)
75 100
Burst/Back Porch Delay vs RSET
VDD=5V, TA=25°C
350
300
250
200
150
100
50
0
200 400 600
RSET (kΩ)
800
Vertical Default Delay vs RSET
VDD=5V, TA=25°C
120
100
80
60
40
20
0
200 400 600
RSET (kΩ)
800
Burst/Back Porch Width vs Temperature
3.9
3.8
3.7
3.6
5.5V
3.5
3.4 5V 4.5V
3.3
3.2
3.1
-50
-25
0 25 50
Temperature (°C)
75
1000
1000
100
5
5 Page 
EL1881C
Sync Separator, Low Power
pole roll-off frequency of about 500kHz. This suffi-
ciently attenuates the 3.58MHz (NTSC) or 4.43MHz
(PAL) color burst signal, yet passes the approximately
15kHz sync signals without appreciable attenuation. A
chroma filter will increase the propagation delay from
the composite input to the outputs.
Simplified Block Diagram
Figure 5.
* Note: RSET must be a 1% resistor.
Figure 6.
11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet EL1881C.PDF ] | |
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