Key facts
- Model
- LM1881
- Industry
- Industrial
- Documents
- 6
- Languages
- EN
- Last added
- 2012-05-10
Start here
National Semiconductor LM1881/LM1881-X Video Sync Separator Datasheet
The LM1881 family extracts composite, vertical sync, burst/back‑porch, and odd/even field information from NTSC, PAL, and SECAM video signals. It operates from a single 5 V‑12 V supply and requires only a few external components (decoupling capacitor, input coupling capacitor, and a resistor on pin 6 to set internal current levels). The device can handle input amplitudes from 0.5 V to 2 V p‑p and works over an ambient temperature range of –40 °C to +85 °C (LM1881‑X).
Four primary outputs are provided: composite sync, vertical sync, burst/back‑porch, and an odd/even field indicator. These outputs enable applications such as video‑camera lock‑in, frame‑memory field identification, sync recovery, and color‑burst extraction for downstream processing.
National Semiconductor LM1881 specifications
| Supply Voltage | 5 V DC to 12 V DC |
|---|---|
| Operating Temperature (LM1881‑X) | –40 °C to +85 °C |
| Power Supply Drain Current | < 10 mA |
| Output Sink Current (Pins 1, 3, 5) | 5 mA |
| Output Sink Current (Pin 7) | 2 mA |
| Vertical Sync Output Pulse Width | 140 ps – 300 ps (typ.) |
Source: National Semiconductor LM1881/LM1881-X Video Sync Separator Datasheet
All National Semiconductor LM1881 documents by type
Day-to-day operation, settings and troubleshooting. Start here if the product is already set up.
Ratings, dimensions and ordering codes, for selection and design work.
- National Semiconductor LM1881/LM1881-X Video Sync Separator Datasheet 12 p
- NATIONAL SEMICONDUCTOR - LM1881 LM1881-X Video Sync Separator 12 p
- National Semiconductor LM1881 Video Sync Separator Datasheet 12 p
- National Semiconductor LM1881/LM1881‑X Video Sync Separator Datasheet 12 p
- National Semiconductor LM1881 Video Sync Separator Datasheet 12 p
Questions answered in these manuals
What supply voltage does the LM1881 require?
The device operates from a single supply voltage between 5 V DC and 12 V DC.
From: National Semiconductor LM1881/LM1881-X Video Sync Separator Datasheet
What is the purpose of the odd/even field output?
Pin 7 provides an odd/even field indicator that identifies which video field (odd or even) is present at the input, useful for frame‑memory storage and field‑based processing.
From: National Semiconductor LM1881/LM1881-X Video Sync Separator Datasheet
What supply voltage does the LM1881 require?
It operates from a single supply voltage between 5 V and 12 V DC.
From: NATIONAL SEMICONDUCTOR - LM1881 LM1881-X Video Sync Separator
What is the typical supply current at a 5 V supply?
Typical supply current is 5.2 mA at a 5 V supply.
From: NATIONAL SEMICONDUCTOR - LM1881 LM1881-X Video Sync Separator
What supply voltage does the LM1881 require?
It operates from a single supply voltage between 5 V DC and 12 V DC.
From: National Semiconductor LM1881 Video Sync Separator Datasheet
What video signal amplitudes can the LM1881 handle?
It accepts composite video amplitudes from 0.5 V to 2 V peak‑to‑peak.
From: National Semiconductor LM1881 Video Sync Separator Datasheet