Hardware Hacking

LM1881 Description
Video Sync Separator
LM1881 Vendor
National Semiconductor
LM1881 Categories
Video Sync Separators

LM1881 Features
AC coupled composite input signal
>10 k input resistance
<10 mA power supply drain current
Composite sync and vertical outputs
Odd/even field output
Burst gate/back porch output
Horizontal scan rates to 150 kHz
Edge triggered vertical output
Default triggered vertical output for non-standard video signal (video games-home computers)
-40°C to +85°C operation (LM1881-X)

LM1881 Description
The LM1881 Video sync separator extracts timing information including composite and vertical sync, burst/back porch timing, and odd/even field information from standard negative going sync NTSC, PAL* and SECAM video signals with amplitude from 0.5V to 2V p-p. The integrated circuit is also capable of providing sync separation for non-standard, faster horizontal rate video signals. The vertical output is produced on the rising edge of the first serration in the vertical sync period. A default vertical output is produced after a time delay if the rising edge mentioned above does not occur within the externally set delay period, such as might be the case for a non-standard video signal.

LM1881 Datasheet and Application Notes
LM1881 Datasheet

Parameter Value
Temperature Min (deg C) 0000000000.0000
Temperature Max (deg C) 70
Function Sync Separator
Supply Voltage (Volt) 5
OtherSupply Voltage 5V to 12V
DisplayType CRT
Products related to LM1881
LM1881N LM1881M-X LM1881N-X LM1881MX
LM1881M LM1881MX-X

EL4583 Description
Video Sync Separator, NTSC PAL SECAM, 50% Slice, S-H, Filter, HOUT
EL4583 Vendor
Intersil
EL4583 Categories
Video Sync Separators

EL4583 Features
NTSC, PAL, and SECAM sync separation
Single supply, +5V operation
Precision 50% slicing
Built-in programmable color burst filter
Decodes non-standard vertical
Horizontal sync output
Sync. pulse amplitude output
Same socket can be used for 8-pin EL4581
Low-power CMOS
Detects loss of signal
Resistor programmable scan rate
Few external components
Available in 16-pin PDIP and 16-pin SO (0.150″) packages

EL4583 Applications
Video special effects
Video test equipment
Video distribution
Multimedia
Displays
Imaging
Video data capture
Video triggers

EL4583 Datasheet and Application Notes
Temperature Compensation for the EL4581 and EL4583
EL4583 Datasheet

Products related to EL4583
EL4581

EL4581 Description
Video Sync Separator, NTSC PAL SECAM, 50% Slice, S-H, Filter
EL4581 Vendor
Intersil
EL4581 Categories
Video Sync Separators

EL4581 Features
NTSC, PAL and SECAM sync separation
Single supply, +5V
Precision 50% slicing, internal caps
Built-in color burst filter
Decodes non-standard verticals
Pin compatible with LM1881
Low power
Typically 1.5mA supply current
Resistor programmable scan rate
Few external components
Available in 8-pin PDIP and SO packages

EL4581 Applications
Video special effects
Video test equipment
Video distribution
Displays
Imaging
Video data capture
Video triggers

EL4581 Datasheet and Application Notes
EL4581 Datasheet
A Simple Circuit Removes Sync
Temperature Compensation for the EL4581 and EL4583

Products related to EL4581
EL2157 EL4583 EL2120

EL1881 Description
Video Sync Separator, Low Power
EL1881 Vendor
Intersil
EL1881 Categories
Video Sync Separators

EL1881 Features
NTSC, PAL, SECAM, non-standard video sync separation
Fixed 70mV slicing of video input levels from 0.5VP-Pto 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

EL1881 Applications
Video amplifiers
PCMCIA applications
A/D drivers
Line drivers
Portable computers
High-speed communications
RGB applications
Broadcast equipment
Active filtering