Baseband Delay Line
U3665M
Baseband Delay Line 64 ms (Improved Version)
Application
In TV sets, the integrated baseband delay line circuit i...
Description
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 ...
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