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'[EE]: Searching for Digital Potentiometer with hig'
2001\02\17@204657 by Neil Gandler

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I would like to use digital potentiometers for digital tuning of an analog filter, as an alternative to a noisy Switched Capacitor filter, or more expensive and complex DSP solution. The problem with most Digital Pots, is that the end to end resistance tolerance is 20% of greater. I am searching for a digital potentiometer with precision resistance settings <1%. So a setting of 12.4K would be 12.4K +/-1%. I would appreciate any leads. Thanks!

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2001\02\17@210147 by Herbert Graf

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> I would like to use digital potentiometers for digital tuning of
> an analog filter, as an alternative to a noisy Switched Capacitor
> filter, or more expensive and complex DSP solution. The problem
> with most Digital Pots, is that the end to end resistance
> tolerance is 20% of greater. I am searching for a digital
> potentiometer with precision resistance settings <1%. So a
> setting of 12.4K would be 12.4K +/-1%. I would appreciate any
> leads. Thanks!

    A quick look over the data sheet didn't say but try looking at the
MAX5400 and MAX5401. Might be what you're looking for. TTYL

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2001\02\17@213540 by Spehro Pefhany

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At 05:45 PM 2/17/01 -0800, you wrote:
>I would like to use digital potentiometers for digital tuning of an analog
filter, as an alternative to a noisy Switched Capacitor filter, or more
expensive and complex DSP solution. The problem with most Digital Pots, is
that the end to end resistance tolerance is 20% of greater. I am searching
for a digital potentiometer with precision resistance settings <1%. So a
setting of 12.4K would be 12.4K +/-1%. I would appreciate any leads. Thanks!

I don't think you'll find such a thing anywhere.

Analog Devices has some new products that are +/-30% but have channel
matching on
multiple devices of +/-1%, which might be what you really need. The tempco
is also
a very reasonable 30ppm/K. Watch out for the 100 ohm "wiper resistance" (what
tempco etc. does *it* have?) and the rather large capacitance of ~50pF.

Best regards,
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2001\02\17@221617 by Tim Hamel

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In a message dated 2/17/01 5:49:15 PM Pacific Standard Time,
.....neil_gandlerKILLspamspam@spam@GETMAI.COM writes:

> I would like to use digital potentiometers for digital tuning of an analog
> filter, as an alternative to a noisy Switched Capacitor filter, or more
> expensive and complex DSP solution. The problem with most Digital Pots, is
> that the end to end resistance tolerance is 20% of greater. I am searching
> for a digital potentiometer with precision resistance settings <1%. So a
> setting of 12.4K would be 12.4K +/-1%. I would appreciate any leads. Thanks!
>

Why not check out Microchip's own digital pots.?  I believe their max
tolerance is ~1% Here's a link:

http://www.microchip.com/10/lit/pline/analog/anicateg/digipot/index.htm

Regards,

Tim Hamel

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2001\02\20@132101 by O'Reilly John E NORC

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I love this list.  Just last week I was asking co-workers how I can have a
circuit "remember" a voltage.  Anyway, where can I get digital pots?  And
how much do they cost?  I searched Digi-Key and came up with nothing, and
Microchip's buy.microchip.com doesn't have them.

Thanks,
John

{Original Message removed}

2001\02\20@132527 by David VanHorn

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At 10:18 AM 2/20/01 -0800, O'Reilly John E NORC wrote:
>I love this list.  Just last week I was asking co-workers how I can have a
>circuit "remember" a voltage.  Anyway, where can I get digital pots?  And
>how much do they cost?  I searched Digi-Key and came up with nothing, and
>Microchip's buy.microchip.com doesn't have them.

Xicor.


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2001\02\20@132718 by Peter Tiang

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   http://www.xicor.com/products_xdcps.html


----- Original Message -----
From: "O'Reilly John E NORC" <.....OReillyJEKILLspamspam.....CORONA.NAVY.MIL>
To: <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>
Sent: Wednesday, February 21, 2001 2:18 AM
Subject: Re: [EE]: Searching for Digital Potentiometer with high precision
/tolerance


> I love this list.  Just last week I was asking co-workers how I can have a
> circuit "remember" a voltage.  Anyway, where can I get digital pots?  And
> how much do they cost?  I searched Digi-Key and came up with nothing, and
> Microchip's buy.microchip.com doesn't have them.
>
> Thanks,
> John
>
> {Original Message removed}

2001\02\20@145827 by Dal Wheeler

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dallas semi also has these...
----- Original Message -----
From: David VanHorn <dvanhornspamspam_OUTCEDAR.NET>
To: <@spam@PICLISTKILLspamspamMITVMA.MIT.EDU>
Sent: Tuesday, February 20, 2001 11:24 AM
Subject: Re: [EE]: Searching for Digital Potentiometer with high precision
/tolerance


{Quote hidden}

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2001\02\20@155351 by Dale Botkin

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On Tue, 20 Feb 2001, O'Reilly John E NORC wrote:

> I love this list.  Just last week I was asking co-workers how I can have a
> circuit "remember" a voltage.  Anyway, where can I get digital pots?  And
> how much do they cost?  I searched Digi-Key and came up with nothing, and
> Microchip's buy.microchip.com doesn't have them.

http://www.dalsemi.com/products/pots/index.html

Dale
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