[sdiy] Muxes at maximum voltage.

[Ken Stone]

No go. The first of the devices would still be seeing an over-range input
with respect the power rails, forward biasing the protection diodes.

Ken


>How about using two 4051s in series to increase the voltage range? I know it
>sounds goofy, but I'm just wondering if it might work. Basically, you run
>each 4051 off of +/-7.5V. Now, each analog switch looks like a low-value
>resistor (about 80 - 100Ohms), and if you put two resistors in series each
>one drops half the voltage. In theory, you could stuff a +/-10V signal in
>and each 4051 would only see +/-5V. This seems too simple, so I'm wondering
>if there is some fundamental flaw that I'm missing. At first I thought you
>would want to run the 4051s in parallel, but then they each take half the
>current (and the voltage remains the same). Any comments or abuse from the
>EE heavyweights out there?
_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au or ken at cgs.synth.net
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