I want to test an application using the Analog-to-Digital Converter included in the Spartan 3A Starter Kit Board by
connecting the on-board voltage supply pins (J9 - 1.2V and J11 - 3.3V) as inputs to the ADC. Besides connecting
the wire from the voltage supply pin to the input of the ADC, is there any other wire connection that has to be made for correct
use of the FPGA?
The ADC has its wire connections in a 6-pin header (J22) on the board. It includes a ground pin and a VCC pin. Are these connections
already connected internally or do I have to connect something to the ground and VCC pin?
if there's a pin header with the pions named like you mentioned, the signals are there.
You can check it with a simple voltmeter.
The common ground on the PCB should be the same signal for all supplies.
So, connecting one of the mentioned pins should basically work for testing ADC.
If you want to make it a little more comfortable and versatile you may use a potentiometer as a voltage divider.
So you can put any voltage in that range to the ADC input. Also you just need to connect to J22 and not put wires across the board.
Have a nice synthesis