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.

Features

● 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 [±(R–Y) and ±(B–Y)]

● Line-locked by the sandcastle pulse

● No crosstalk between SECAM color carriers (diaphoty)

● Comb-filtering functions for NTSC colordifference signals

● Correction of phase errors in the PAL system

Application

In TV sets, the integrated baseband delay line circuit is suitable for decoders with color-difference signal outputs