Originally, the EL1883 is designed to use in the NTSC, PAL and SECAM (Bi-level sync) applications. But with some external circuitries, it can also be used to separate most of the HDTV (Tri-level sync) signals automatically. Normally, the EL1883 uses a resistor RSET to control the internal timing. It is a current source and the current is set by the value of RSET.
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