Features

NTSC, PAL, SECAM, non-standard video synchronous separation

video input level from 0.5VP-P to 2VP-P fixed fixation 70mv slice

Low power supply current-1.5MA typical value.

Single power supply+5V

Compound vertical synchronization output

; Emergencies/gallery output

Provide 8 LD PDIP and SOIC packaging

Provide lead (in line with ROHS)

Application

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Video amplifier

PCMCIA application

a/d drive

line drive [123 ]

Portable computer

High -speed communication

RGB application

Broadcast equipment

[

123] Active filtering

Demonstration board

Provide a dedicated demonstration board.

Low -power synchronization separator

EL1881

Video synchronizer separator is made of Elanterc's high -performance simulation CMOS process. The device extracts synchronous timing information from standard and non -standard video input. It provides composite synchronization, vertical synchronization, emergency/corridor time and stagnant field detection. When a fixed 70mV synchronous cutting tip section provides synchronous edge detection, the video input level is 0.5VP-P and -2VP-P (synchronous cutting-end amplitude 143mv to 572mv). An external resistance is set to all internal fixed time to adapt to various video standards. The composite synchronous output follows the video of the video, and the first vertical sawtooths of the vertical pre -balanced string output the vertical synchronization pulse along the upper output. For non -standard vertical inputs, when the vertical signal is kept at a low level exceeding the vertical synchronization default delay time, the output default vertical pulse. The puppet output indicates the polarity detected during the vertical discharge interval. EL1881 is a compatible plug -in compatible with industrial standard LM1881, which can replace this part in 5V applications that require lower power currents.

EL1881 can be used in 8 LD PDIP and SOIC packaging, and is specified in the temperature range of -40 ° C to+85 ° C.

pinout

Typical performance curve

Sequence diagram

Note:

1. Evaluation permit with environmental impact, copy signal 1A drawing.

2. Complex synchronous output to delay to reproduce all video input synchronous pulses.

3. The vertical synchronization cutting edge and the first vertical sawtooth pulse of the front edge of the front edge of the edge of the first vertical sawtop, which has delayed transmission.

4. The output of the coupling field is low, and the output of the coupling field is high.

5. The corridor becomes low, and the back edge of the synchronous pulse in the video has a fixed pulse width. Note that for the sawtooth pulses during vertical periods, the corridor starts from the rising edge of the sawtooth pulse (with delayed communication).

Expansion timing diagram

Application information

Video input

FIG. 24 shows the Simplified Box Chart " on page 11.

AC coupling video signal is entered into a video of Tube 2 by C1 with a nominal C1 with a nominal 0.1 μF. The clamp charging current will prevent the signal on the tube foot 2 be negative than the synchronous cutting -edge reference voltage (about 1.5V). The charging current is about 1 millowte in name. About 10 Mi'an clamp discharge currents always try to discharge C1 to synchronize cutting -edge REF