[Yaaarc] Re: Analog Mux recommendations

[Erik Kauppi]

74HC4051 is dirt cheap, available in DIP, easy to use, and works pretty 
well with single supply.

We built a lot of dataloggers with these, back in the day.  it goes to 
within a few millivolts of zero.  12 bit accuracy no problem.  We were 
doing 0..4v analog range with a 5v supply so I'm not sure how close to the 
plus rail it goes, you'd have to read the spec.  Or cheat and run the '4051 
at 5.2 volts or something?

74HC4051 is an 8:1 analog switch, but there are other arrangements in the 
same family.
Note that the 74HC part is important.  74LS, 74HCT, and so on can be quite 
different when using them for analog applications.

---------------------

At 06:22 PM 1/14/07, Keith Mc. (Route-To YAR) wrote:
>Keith Mc. (Route-To YAR) <acti at provide.net> wrote:
> > I am looking at a robot application that needs way more 0-5V
> > analog inputs than the MPU provides.
> >
> > Anyone have experience/recommendations for an easy to use analog
> > mux chips (preferrably available from Digikey) [...]
>
>Ex: I'm sort of looking at the Intersil/Vishay DG409, but it
>appears to require +/- supplies.  Anyone have any experience with
>it?  Will it run well either single ended, or with a trivial
>negative charge pump?  (I've got a car battery, so it's a
>decent PLUS supply...)
>
>If not, are there any DECENT analog switches out there that run
>well from single ended supplies?
>
>OR, is there a SIMPLE trick to generate enough clean, balanced
>plus/minus supply from a small robot, to run a dual supply amux chip?
>
>Thanks!
>
>- Keith Mc.
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---- Erik Kauppi -- ekauppi at corsa-inst.com (734) 761-1545 ---
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