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Sampling DAC output with an ADC

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beauch10

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Hello,

I'd like to sample my DAC output with an ADC in the oscilloscope. When I do this, I will get some data in Excel with two columns - one being time, and the other being the corresponding quantized output voltage.

My simple question is this - for a particular (time, Vout) pair, how can I tell exactly which code was used as input to the DAC? I suspect there has to be some sort of synchronization scheme? What's the best/easiest way to do this?

Thank you.

Dan
 

barry

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The simple answer is you can't. You would need to look at the input signals to the DAC. It could be further complicated by pipeline delays, etc.
 

KlausST

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Hi,

The DAC surely needs an input.
Who/what controls this input?
Best is if you have access to the DAC inputs and you can send a test pattern to the DAC.

Klaus
 

barry

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Not sure what you're trying to do, but you could just put a static value on the input to the dac and then monitor the adc.
 

beauch10

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Hi,

The DAC surely needs an input.
Who/what controls this input?
Best is if you have access to the DAC inputs and you can send a test pattern to the DAC.

Klaus

I have access to the DAC input. I'm trying to obtain the transfer curve of the DAC. I then want to invert this transfer curve to populate a pre-distortion LUT. It's easy to do a dc measurement of the transfer curve, but the transfer curve changes when I go to higher frequencies. I want to be able to obtain this transfer curve using a signal around the frequency of interest.

Dan
 

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