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power connections for + and - voltages through a 4051B mux
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dentaku



Joined: Apr 24, 2013
Posts: 6
Location: Canada

PostPosted: Mon Mar 03, 2014 3:59 pm    Post subject: power connections for + and - voltages through a 4051B mux Reply with quote  Mark this post and the followings unread

I'm breadboarding a very simple little 8 step sequencer out of found parts and I'd like it to output + and - voltages.

I'm using a 4051B multiplexer to switch the voltages coming from 8 voltage dividers in sequence controlled by a 4029B up/down counter.

This is NOT a serious instrument, it's definitely NOT for controlling real V/Oct modules Smile which I don't even own and it all works off of two 9V batteries, so It's just for fun and for learning about 4000 series stuff.

QUESTION:
I'd like it to be able to send out positive and negative voltages (-9V to +9V) so does this mean that I should connect the Vss pin to 0V and the Vee pin to -9V? Or should Vss and Vee just both be 0V?

I ask this because...
the Toshiba TC4051B datasheet says
"The digital signal to the control terminal turns "ON" the corresponding switch of each channel, with large amplitude (Vdd-Vee) can be switched by the control signal with small logical amplitude (Vdd-Vss). For example, in the case of Vdd=5V, Vss=0V and Vee=-5V, signals between -5V and +5V can be switched from the logical circuit with single power supply of 5V. As the ON resistance of each switch is low, these can be connected to the circuits with low input impedance."

The common output of the mux will got to an Opamp buffer connected to +/- 9V so it won't draw too much current through the 4051B.


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4051B_pinout.PNG


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