ADC 1410 cannot collect the -5V to 5V signal

[Tommy 777]

I tried to use Eclypse Z7 and ADC 1410 to collect the Sin wave signal which is between -5V to 5V, but I found something strange.

The channel 1 just gets -4.6V to 5V and the channel 2 just gets -5V to 4.6V. They all cannot get the whole signal from -5V to 5V.

Is that the problem about the hardware or the programming?

Thanks for any suggestion.