U3665M

U3665M Baseband Delay Line 64 ms (Improved Version) Application In TV sets, the integrated baseband delay line circuit is suitable for decoders with color-difference signal outputs Description The integrated delay line circuit U3665M is suitable for all chroma decoders with baseband color-difference outputs. It is suitable for PAL-, SECAM- and NTSC-signals as well. The U3665M contains two separate delay lines for processing (R–Y)-output and (B–Y)-output separately. The delay is performed by internally switched capacitors. On-chip postfiltering avoids the need for external filter components. In the case of the U3665M, the postfilter is tuned to Bessel-characteristic. A summing circuitry 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 is easily done by feeding a line-frequent impulse (usually the SC-impulse) to the sync-input of the IC. Features D One line delay time, addition of delayed and non-delayed output signals D Line-locked by the sandcastle pulse D No crosstalk between SECAM color carriers (diaphoty) D Adjustment-free application, VCO without external components D Handles negative or positive color-difference input signals D Comb-filtering functions for NTSC colordifference signals D Clamping of AC-coupled input signals [±(R–Y) and ±(B–Y)] D Correction of phase ...