Hi Team,
As I know, analog switch is often used by voltage source switch.
Could you let me know whether we could use current source as input? (COM1)
Roy
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Hi Roy,
Yes you can if the following conditions are met:
1. The current being injected through the switch is less than or equal to the absolute max current, which is +/- 200mA for this device for normal operation.
2. Voltage w.r.t. ground at inputs are within rated operating ranges as well. For this part the input voltages should be <= the supply voltage provided to the IC.
Best,
Parker Dodson
Do the current source or the pull-up resistor use a supply that is higher than the switch's VCC? (This could also happen if the switch is powered off.)
Does the pull-up resistor limit the current to less than 200 mA?
Hi Ladisch,
1. Do you mean that NO pull high voltage couldn't over Vcc, is it correct?
2. NO pin is open collector structure, we will let Ic < 200mA
3. Could NC/NO pin be I/O interface?
Roy
Hi Roy,
Everything Clemens has said is correct, but the one thing I am not sure of is the voltage at the NC pin from the current source. If this is over the switches VCC voltage there could be damage sustained on the part from the application. The current magnitude isn't a concern, but the voltage on the pin w.r.t. may cause issues but besides that I think the application looks fine.
Best,
Parker Dodson