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Max11300 sample phases

davegadgeteer

The Max11300 has about 20 channels of ADC, but I need to know the time difference between the channels' samples.

 

I want to digitize multiple signals and study their phase differences.

 

Ideally I'd sample and hold all channels at the same time, either muxing the ADC or having one ADC per channel.

 

If I use multiple ADCs, they need to be sync so they sample at the same time.

 

Anybody dealt alt with a problem like that?

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  • 0 in reply to davegadgeteer

    Hi David,

     

    There is a note 4 at the bottom of page 11 of the datasheet specifying the sample rate, it goes down as the number of configured ports is increased. I'm not familiar with this device but I think if the IC could sample simultaneously, it would have been mentioned in the datasheet, because that would have been a marketable feature.

    Some choices are to either to live with the fact that they won't be sampled simultaneously, or try to find an alternative device that can achieve it for all the channels you want, or alternatively use multiple devices and control them simultaneously (from a microcontroller or CPLD/FPGA) or to try to use some maths in a microcontroller to try and find the values aligned in time (e.g. using interpolation).