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ADV7393: what's the way to increase the amplitude of the video output?

Question asked by Ofek on Feb 5, 2015
Latest reply on Feb 9, 2015 by PaulS

equired increase of video output signal DAC1 amplitued by a factor of 2 (two).

tried by s/w, got only few percent increase.

tried to reduce Rset from 4.12 to 2K; the sync section of the signal is x2, but the data section of the video signal is not increase that much.

questions:

1. is there a formulat for the depenency between the video amplitude and value of Rset?

2. is chagne of Rset the real method to control the amplitude of the output signal?

3. is there any other way to increase the amplitude of the output signal?

 

conditions:

video ouput is NTSC, used only DAC1.

there is a 1:1 filter-amplifier stage  after DAC1, which can't be increased to 1:2.

 

 

thenaks.

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