On Sampling Rates/Timing for Analog Video Signals 1

[Ryan Allybaum]

I have to work with a linear image sensor, 1x2048 pixel array, for sampling this video signal using an ADC (obviously), am I dependent on the start scan signal from the image sensor for syncing my sample rate for the ADC? Otherwise I’d have to oversample in order to provide a good analysis of the signal? E.G. every single ADC sample must be perfectly timed with the peak of each analog voltage reading.

It this supposed to be guess work using delays inside of a microcontroller? Can any ADC sampling at the same frequency of the analog signal successfully sample uniformilly, (offset from the peak can simply be gained in software)?

 

[GregLocock]

Wouldn't the need for perfect sync be reduced by the effective 'hold' time of each pixel?

Cheers

Greg Locock


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[Ryan Allybaum]

The hold time is very helpful, but doesn’t compensate for samples taken at the falling or rising edges or off-by-one errors at the start and end of the signal stream.

 

[IRstuff]

That should all be specified in the datasheet of the sensor

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[Ryan Allybaum]

@greg you’re dead right, thanks, I went and looked at the signal through the scope. @irstuff yep, just rusty on my timing charts.

 

[Alex Marchena]

Hi. That should all be specified in the datasheet of the sensor. Or try reading this

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