I'm having problems with using the ADG419. It is very inconsistent sometimes and I'm not sure what I'm doing wrong. My first problem is that the voltage drops off at the drain output despite making no connections to other circuits. In this circuit, I am feeding 3Vdc from S2 and using port 1(drain) as the output. The switch is configured to output whatever is in S1 to port 1 as port 6 is set to 0.
It is a bit hard to see, but the output starts at 3V and immediately drops to 2V. I tried conducting a test with the exact circuit in a new project and the results matched up with what I have anticipated. I'm not sure why this is a problem.
My second problem is that when I connect port 1(drain) to the circuit on the right above, port 1 becomes 0V. It seems that port 1 matches whatever voltage I put in the positive terminal of the AD8676 as I tried putting 3V and the voltmeter measured approximately 3V at port 1.
This is what happens when I connect the port 1 to the negative terminal of the AD8676. The circuit is connected similar to the schematic shown below.
My third problem is that the switch sometimes dampens the output signal. For example, in this simulation I am running a sine signal with an amplitude of 3V to port 1(drain) as the input. I am using S1 as the output because I set port 6 to 0V. However, as shown in this graph, the switch seems to dampen the input signal.
If you could help me clarify these problems it would be greatly appreciated.