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From: bryan@isrc.sandia.gov (Jon R Bryan)
Subject: Re: 2 circuit design questions
Message-ID: <1994Mar2.154514.18570@isrc.sandia.gov>
Organization: Sandia National Labs, Org. 1600, Albq., NM
References: <1994Feb25.171354.13736@mksol.dseg.ti.com>
Date: Wed, 2 Mar 1994 15:45:14 GMT
Lines: 27

In article <8549@falcon.ukc.ac.uk> jf2@ukc.ac.uk (The Black Baron) writes:
>
>1. How do I go about producing a programmable variable resistance ?

Dallas Semiconductors DS1267 dual digital pot (which works quite well)
  "          "        DS1666 audio digital resistor
  "          "        DS1667 digital resistor with op amp
  "          "        DS1668, DS1669 digital rheostat

Dallas Semiconductor Corp.
4401 South Beltwood Parkway
Dallas, TX 75244-3292
TEL: 214-450-0448
FAX: 214-450-0470

I have also used a Xicor X9MME digital pot.  It had a serious quirk.  It
would power up showing an open circuit on the wiper pin.  Banging on the
wiper step line about 100 times always seemed to correct it, but
defeated the nonvolatile memory feature.

Disclaimer:  I'm just a customer. 

-- 
Jon R. Bryan	(505) 844-2015	<=>	jrbryan@isrc.sandia.gov
Intelligent System Sensors and Controls Dept. 2111
Sandia National Laboratories
P.O. Box 5800, Albuquerque, New Mexico 87185-0949
