I am trying to implement a CAN sniffer on an Altera DE2-115 evaluation boar d with the Terrasic AD/DA data conversion card (High Speed Mezzanine Card ( HSMC) via SMA. I am using two A/D channels for CAN_H and CAN_L bus signals.
Before testing it with real CAN signals I want to make sure that the connec tion is right in terms of voltage swing, differential termination and peak- to-peak voltage. If I got it right I expect a voltage swing of about 1 volt on the CAN_H and CAN_L signal, whereas the input characteristics for the d ata conversion card say something about 0.5V. But I am not sure if I unders tood it correctly.
Could somebody please verify, unfortunately I am no expert in analog electr onics. Any help is highly appreciated.