2017-06-20 23:35 GMT+03:00 Peter C. Wallace <p...@mesanet.com>:
>
>> This is not unexpected, the card is probably fine
>
> The 7I47S has differential inputs, They are not designed to interface with
> single ended signals but can if needed.
>
> The only way the inputs will work reliably is to have a positive
> differential voltage across the inputs in one case and a negative
> differential voltage in the other case.
>
> If you have single ended say 5V signals you wish to read what you can do
> is this:
>
> Make a low impedance voltage reference of 2.5V with 2 series 100 Ohm
> resistors from the 7I47S 5V pins.
>
> Connect this 2.5V reference to the inverted input pin of all the 7I47S
> inputs
> you wish to use, then connect your 5V single ended signals to the
> non-inverted inputs. Now when you input signal is 5V the input pair see
> +2.5V and when input signal is 0V, The input pair see -2.5V
>
> (this will only work with termination off)
>
>
Thanks a lot! I'll try that.
Like this, right?
I think I better supply 5V to P1 in this case.
What is termination in this board? Simply a resistor across the input? What
is it for?
Thanks
Andrew
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