I am using switches adg5412 and 5408 and I have some issues with each one.
When powered on and the EN pin set to enabled = 0, I measure an impedance between the input and output which is not infinite, and which depends on the frequency of the signal.
This means the switches are not really disconnected, since I work with 500kHz input signals.
Please find attached an impedance sweep which illustrates this issue.
Could you please help me with this ?
Thank you in advance.
You are correct. The off isolation is directly related to the frequency of the input voltage. This can be seen in Figure 16 of the datasheet.