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ADG444 : typical supply current and maximum supply current


I have a question about supply current of ADG444 from our customer.

Typical specification of IDD and ISS under 25'C is 0.001uA and maximum it is 1uA.
It is 1000:1 ratio between typical value and maximum value at same temperature.
I can't imagine why these large difference is.
Our customer, who is using the number of 400 of ADG444 in his product, is worrying the power consumption .
What condition consume 1uA at 25'C ?

Best regards,


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