DE2-115 and Terasic High Speed AD/DA daughter card

Hi rebk,

The 2V DC signal you're applying isn't going to get through the transformer. AC only I'm afraid. So, don't expect any exciting results from your initial tests.

As already stated there is a 49R9 resistor to ground on the input. So, it's not shorted to ground but it is intended to be driven by something with a 50R source impedance.

As for what input signal is appropriate - you'll need to refer to the Reference Manual for the Data Conversion card. See the 'A/D Converter' section under 'Component Interfaces' on page 2-8.

--- Quote Start ---

I have an input signal as 2V amplitude, 80 ns, 100 Hz...

--- Quote End ---

Do you mean an 80ns pulse every 10ms? That might work. However, you need to be aware that the shape of the signal going into the ADC is going to be somewhat different to the signal you drive in thanks to that transformer.

Cheers,

Alex