ADC3910D065: Input Impedance

Jonathan Kolbrak

Intellectual 500 points

Part Number: ADC3910D065

Tool/software:

Hello,

I'm looking for information on the input impedance for the buffered inputs.

Regards,

Jon

over 1 year ago

0 Rob Reeder over 1 year ago

TI__Mastermind 38790 points

Hi Jon,

What information do you need? Sparameters?

Typically, lower power ADC devices like this, are unbuffered and have a very high input impedance.

However, I see in the datasheet that the analog input is buffered. Let me check with design and get back to you.

Regards,

Rob

0 Jonathan Kolbrak over 1 year ago in reply to Rob Reeder

Intellectual 500 points

Hi Rob,

Yes, S-parameters would be good. I saw that it is buffered too which was why I asked.

Thanks,

Jon

0 Rob Reeder over 1 year ago in reply to Jonathan Kolbrak

TI__Mastermind 38790 points

Hi Jonathan,

I can take some quick sparameters for you. However, this measurement would include the SMA connector and traces leading up to the ADC's analog inputs.

I don't have a way to deembed those parasitics. And we do not have an specific sparameter board yet for this measurement.

I will report back in a few days, as I will need to set this up in the lab to collect the data.

Regards,

Rob

+1 Rob Reeder 11 months ago in reply to Rob Reeder

TI__Mastermind 38790 points

Hi Jonathan,

I apologize for the delay.

Please see the attached Rin and Cin curves vs. frequency.

Regards,

Rob

AIN_DIFF_ZIN-ADC39xx.xlsx

0 Jonathan Kolbrak 11 months ago in reply to Rob Reeder

Intellectual 500 points

Thanks for the support

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ADC3910D065: Input Impedance