The LM1881 Video sync separator extracts timing informa- tion including composite and vertical sync, burst/back porch timing, and odd/even field information from standard nega- tive 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.
The LM1881 video sync separator extracts timing information—including composite and vertical sync, burst/back‑porch timing, and odd/even field data—from standard NTSC, PAL and SECAM video signals with amplitudes from 0.5 V to 2 V p‑p. It also supports non‑standard, faster horizontal‑rate video signals and can generate a default vertical output for unusual signals.
Key features include AC‑coupled composite input, >10 kΩ input resistance, <10 mA supply drain current, composite and vertical outputs, odd/even field output, burst/back‑porch output, horizontal scan rates up to 150 kHz, and operation from a single 5 V‑12 V supply. Electrical specifications, absolute maximum ratings, and typical performance curves are provided for design reference.
| Supply Voltage | 5 V DC to 12 V DC |
|---|---|
| Input Signal Amplitude | 0.5 V to 2 V p‑p |
| Power Supply Drain Current | <10 mA |
| Horizontal Scan Rate | up to 150 kHz |
| Output Sink Current (Pins 1,3,5) | 5 mA |
| Output Sink Current (Pin 7) | 2 mA |
| Package Dissipation | 1100 mW |
| Storage Temperature Range | -65 °C to +150 °C |
It operates from a single supply voltage between 5 V DC and 12 V DC.
It accepts composite video amplitudes from 0.5 V to 2 V peak‑to‑peak.
Pin 7 goes high during odd fields and low during even fields, providing an odd/even field index.
The device supports horizontal scan rates up to 150 kHz.