U3661M

` One line delay time, addition of delayed and non-delayed output signals
` Adjustment-free application, VCO without external components
` Handles negative or positive color-difference input signals
` Clamping of ac-coupled input signals [±(RY) and ±(BY)]
` Line-locked by the sandcastle pulse
` No crosstalk between SECAM color carriers (diaphoty)
` Comb filtering functions for NTSC color-difference signals
` Correction of phase errors in the PAL system

* MIL standard 883D, method 3015.7 machine model (all power pins connected together)

The integrated delay line circuit U3661M is suitable for all chroma decoders with baseband color-difference outputs. It is suitable for PAL-, SECAM- and NTSC-signals as well. The U3661M contains two separate delay lines for processing (RY)-output and (BY)-output separately. The delay is performed by internally switched capacitors. On-chip postfiltering avoids the need for external filter components.

A summing circuitry of U3661M combines the information of adjacent TV-lines, thus giving an interpolated sum for the PAL-system, storing preceeding lines for the SECAMsystem and providing a comb-filtered output for NTSC-signals. Due to internally-generated timing, synchronization U3661M is easily done by feeding a line-frequent impulse (usually the SC-impulse) to the sync-input of the IC.