LTSPICE Simulation

Question

Hi Team 
 I want to use the ADG2412 in my new design 
 The switch is used for analog video NTSC. The switch is the first component from the Coax cable. 
 There might be a case that my unit is powered off and there is still active video from the video source. 
 I want to protect the analog switch with external shottcky diodes. 
 I tried to simulate it with the LTSPICE but is seems that in over voltage case the current flows to the GND instead of the VDD or VEE

Is this a normal behavior? Is it a mistake in simulation model? 
 I attached the LTspice simulation. 
 Thanks 
 Roey 
 
 ADG2412_ANALOG_SWITCH.asc

Geloism16 · Accepted Answer

Hi Roey ,

I tested this part on my side and observed the same unexpected behavior. Based on my analysis, this appears to be a model issue, and we plan to update the model accordingly. Please note that this part was released several years ago and was not fully optimized, which may explain some of the observed behavior. 
 As a side note, we will be updating this model to align with our newer modeling standards. The updated model will include all channels and will specify the supply only in the first specification table, defined as a &plusmn;15 V dual supply with &plusmn;10% tolerance. If you require support for a specific supply condition, such as a &plusmn;5 V dual supply, please submit a request via email at angelo.floralde@analog.com .

Regards, 
 Gelo)

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