Re: [casper] KatADC impedance values

[Dan Werthimer]

hi james,

as far as I know,
all the casper adc board inputs are 50 ohms,
except for the differential input version of the adc16 board,
which has 100 ohm differential inputs.

several of the adc boards are not well terminated
(they aren't 50 ohms at all frequencies...),
especially the earlier boards,
so if you want to minimize reflections, I suggest you insert
a 50 ohm attenuator at the input of the ADC.

best wishes,

dan


On Mon, Feb 22, 2016 at 5:17 AM, James Smith  wrote:

> Hi all,
>
> Is there any reason to believe that the input on the KatADC board (or any
> ADC board which we might end up using) is not a 50-ohm? How would one go
> about determining that? The wiki says nothing about its VSWR or related
> information.
>
> Any thoughts would be appreciated.
>
> Regards,
> James
>
>

[casper] KatADC impedance values

[James Smith]

Hi all,

Is there any reason to believe that the input on the KatADC board (or any
ADC board which we might end up using) is not a 50-ohm? How would one go
about determining that? The wiki says nothing about its VSWR or related
information.

Any thoughts would be appreciated.

Regards,
James