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From: "Richard Webb"
Subject: Re: Digital Potentiometer
Date: Mon, 18 Nov 2002 12:22:25 -0000
NNTP-Posting-Date: 18 Nov 2002 12:20:58 GMT
X-Newsreader: Microsoft Outlook Express 5.00.2919.6700
also check that the frequency response you require can be accomodated by the
digital pot. I seem to remember that digital pots don't have a particularly
high frequency range (most seem to operate in the audio frequency range).
"Ban" wrote in message
> Ian Sheevan wrote:
> > Greetings,
> > There is a 22k ohm potentiometer,
> > [specification: min. round preset, horiz]
> > that i would like to replace with a
> > digital potentiometer.
> > My problem is that i can't figure out most Dallas
> > IC pins that exactly resembles the 3 pin potentiometer.
> > I would appreciate if presented with an IC
> > that i can replace the potentiometer exactly with
> > a digital potentiometer to control the resistance
> > higher or lower.
> > Thank You.
> first you have to make sure, if the voltage range of the pot matches your
> circuit voltages (i.e. 0 to +11V). Then you have to consider that there is
> an additional wiper resistance, which might be 10% of the end value.
> The 3 terminals are called:
> Rh= most positive point
> Wiper= variable point
> Rl= lowest voltage point
> Then there is a digital control via specified bus, not just up/down.
> There might be other pots, but the Dallas ones are like this.
> To replace the analog pot you need to know and understand some circuit
> ciao Ban
> electronic hardware designer
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