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ADG5436 overvoltage protection

Question asked by SteffenH on Dec 16, 2012
Latest reply on Dec 17, 2012 by SteffenH

I have a question about protecting the inputs of an unpowered ADG5436. The document

'Ask The Applications Engineer–40 Switch and Multiplexer Design Considerations for Hostile Environments'

 

http://www.analog.com/library/analogdialogue/archives/45-05/switch_mux.pdf

 

illustrates different possibilities of protecting input signals from overvoltage conditions. Is there anything against to combine the resistor-diode protection network (figure 8) and the blocking diodes (figure 9)? I think of combining these protection schemes in a way, that the schottky diodes are behind the blocking diodes, to prevent the input signal to supply the upstream circuitry in case of an unpowered switch.

 

Kind regards,

Steffen

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