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ADV7341 - NTSC - SUBCARRIER FREQUENCY

Question asked by DJango991 on Jun 20, 2018
Latest reply on Jul 12, 2018 by PoornimaSubramani

Hi,

using the ADV7341 Evaluation Board, I'm triing to visualiza the ColorBar generated internally by ADV7341 over a monitor via CVBS interface (connected at DAC 4) and S-Video interface (conneted at DAC 5 and DAC 6).

I use the Lab View based ADV tool to configure the ADV with the Table 61.

 

If I put on the CLKIN_A pin a 27MHz clock the Color Bar is reproduced correctly while if I use 27,027MHz clock the Color Bar is reproduced in Black&White. In this case, I have tried to change the SUBCARRIER FREQUENCY (registers 0x8C,0x8D,0x8E,0x8F) to adjust the carrier frequency but I didn't find the correct value to obtain a clear Color Bar.

 

So, how I can use correctly the expression listed on page 56 of the datasheet? Or, is there another solution/via to resolve my problem?

 

Thanks,

Sebastiano.

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