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Are ADG1408 channels isolated from ground?

I've got a problem trying to use an ADG1408.
I need to switch an external circuit on different resistors, but this circuit must be isolated from the ground and power supply.

I tried using an ADG1408 but channels seems to be connected to VDD/GND through "diodes" (infinite resistance in one way, around 600 ohms the other way). Is it normal or did I make a mistake in my circuit?

Pull-down resistances are 10k. The ones i try to switch on are 1 to 1000 ohms.

The signal I try to switch is around 5V and I work at a very low frequency (0,1 Hz...)

If I use the wrong component, may I be more lucky with switches like ADG4612?

Thank you for your help,


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