TDA9181

INTEGRATED CIRCUITS DATA SHEET TDA9181 Integrated multistandard comb filter Objective specification File under Integrated Circuits, IC02 2000 Nov 22 Philips Semiconductors Objective specification Integrated multistandard comb filter FEATURES One-chip multistandard adaptive comb filter Cross luminance reduction Cross colour reduction No chroma trap, therefore sharper vertical luminance transients Analog discrete-time signal processing, therefore no quantization noise Anti-aliasing and reconstruction filters are included Input switch selects between two Y/CVBS inputs Output switch selects between combed CVBS and an external Y/C source fSC as well as 2 × fSC colour subcarrier signal may be applied Alignment free Few external components Low power. GENERAL DESCRIPTION TDA9181 The TDA9181 is a an adaptive PAL/NTSC comb filter with two internal delay lines, filters, clock control and input clamps. Video standards PAL B, G, H, D, I, M and N and NTSC M are supported. Two CVBS input signals can be selected by means of an input switch. The selected CVBS input signal is filtered to obtain a combed luminance output signal and a combed chrominance output signal. Switched capacitor circuit techniques are used, requiring an internal clock, locked on to the colour subcarrier frequency. The colour subcarrier frequency as well as twice the colour subcarrier frequency may be applied to the IC. In addition to the comb filter the circuit contains an output switch so tha...