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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