I am currently using the ADG5412, but only using 2/4 of the available switches. The other 2 have their digital inputs tied to ground through a 1k resistor (switch is therefore open), with both the S and D on the respective inputs open. Is there a better way to terminate this switch?
I'm really wondering if the 1k is too big, if I should tie them such that they are closed, and if the source and drain should be tied to anything?
I am somewhat susceptible to noise with the 2 switches that I am using in my application, so the lowest noise termination for the extra 2 I am not using would be the most ideal solution.
It is best to have all switches not used as open and the source and drain inputs terminated by tying them to ground so that there is no voltage difference across the used switch.
Thanks for the quick response.
Would you recommend tying the digital input straight to ground instead of a 1k resistor, or does it matter?
Same question for the source and drain, straight to ground, through a resistor, or doesn't matter?
I'm thinking the larger the resistor, the more susceptible to noise pickup, and the worse channel to channel coupling, so maybe a hard tie to ground would be best for all 3?
I think it is better to tie straight to ground for all three pins rather than using the 1k resistor.
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