TMUX1208: Analog Switch with TIA circuit

Hello Daniel,

I suggest you use the TMUX1308 instead. It has a protection feature called injection current control that can help limit the error you see on the output of your system due to other diasbled signal paths(S2~S8) affecting your results. 

Check out this FAQ on injection current control 

e2e.ti.com/.../faq-how-does-injection-current-control-work-in-ti-analog-multiplexers-switches

Also are you seeing these errors in simulation or is the bench test results?

Thank you and Regards,

Kameron

Hi. Kameron, thank for you reply.

This error was the result of the bench test.

I tested it in simualtion but I can't see any errors. 

I'll check TMUX1308 and share the result.

Thank you.

Hi. Kameron, I checked TMUX1308 But R_on is too high (75ohm at 25 celsius, VDD 5V).

In my opinion, using TMUX1108 as a dual power supply (VDD 2.5V/VSS -2.5V) will prevent injection current (signal level is between VDD and VSS).

{ Injection current is the current that is being forced into a pin by an input voltage (VIN) higher than the positive supply (VDD + ∆V) or lower than the ground reference (VSS or GND). }

When using TMUX1108 for this system, is there anything I should consider?