TDA9181

General description

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 that a selection can be made between the combed CVBS signal and an external Y/C signal.

The IC is available in a DIP16 and SO16 package. The supply voltage is 5 V.

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
• f_SC as well as 2 x f_SC colour subcarrier signal may be
  applied
• Alignment free
• Few external components
• Low power.

Design support

Application Notes

AN99063_1; TV Reference design GTV4000 update (02-Nov-99)

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