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AGD706 over voltage and open input

Thread Summary

The user encountered issues with the ADG706 multiplexer where the output was stuck at a high voltage (5.3V) when an input exceeded the supply voltage (7.5V) and remained constant when an input was left floating. The final answer confirmed that the component is not damaged if the current is limited to 30mA, but did not explain why switching inputs did not change the output voltage. The user also asked about the risks of leaving an input open, which can cause the output to be constant.
AI Generated Content

To whom it may concern,

 

We are using the ADG706 multiplexer and have stumbled upon two different cases we can't explain.

 

1. While using a 3.3V supply, when one input received a voltage higher than the supply (7.5V), the output is stuck on a high voltage (5.3V), regardless of whether the output is connected to the problematic input or not.

2. While one input floats, the output is also constant, regardless of the switching state.

 

Is that a normal behavior of the component?

 

Thank you very much in advance,

Eli.

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