AD7606CFMCZ signal reflections

Hi,

I have been testing the capabilities of the AD7606c-18 with the eval board AD7606CFMCZ + SDP-H1.

After testing around with a function generator measuring one channel, I noticed that all channels are influenced by the signal of channel 5.

I tested a 20khz sinewave with 4.5V amplitude. My testing setup looks like this: (sorry for bad quality)

The sinewave of channel 5 can be seen on all channels, worst one being the one right next to it which shows a sinewave with over 60mV of amplitude.

All Channels are set to +-5V bipolar measurement and only channel 5 is connected to the function generator.

Is it Normal that this happens? To me this seems a bit much, or did I mess something up with the configuration of the jumpers...?

Best Regards

Thomas Gutjahr

  • 0
    •  Analog Employees 
    on Sep 16, 2021 11:55 AM

    Hi Thomas,

    Levels look large alright, but that may be normal with floating inputs. Have you tried applying an actual input signal to the other channels?

    Please have a look to the channel to channel isolation spec in table 2, definition of how this is tested is in terminology section. That would tell what the normal interference expected.

    Regards,

    Lluis.