offset adjusting

[Hairy Harry]

OK (make me go look it up why don't you...)

Its TLC4501 (et al)  and TLC4502
Advanced LinEPIC SELF-CALIBRATING PRECISION OPERATIONAL AMPLIFIER.

Max supply voltage is +7VDC

They say this is good for "long term integration" but somehow without
a bipolar supply... I doubt that...

H^)  harry


>From: Martin Czech <czech at Micronas.Com>
>Reply-To: Martin Czech <czech at Micronas.Com>
>To: harrybissell at prodigy.net
>CC: synth-diy at node12b53.a2000.nl
>Subject: Re: offset adjusting
>Date: Mon, 23 Oct 2000 09:18:39 +0200 (MET DST)
>
>Ok, not chpper, but chopper principle, you could just
>specify when the thing was switching, rigth?
>
>I have never heard of another autozero method,
>I'd be interested if there is one.
>
>NS makes an autozero IC, this can be added to any opamp,
>but again, comparing the output with reference ground,
>and this means switching input and output of the opamp.
>
>m.c.
>
>:::X-Originating-IP: [207.206.127.34]
>:::From: "Hairy Harry" <paia2720 at hotmail.com>
>:::To: czech at Micronas.Com, diode at hotmail.com
>:::Cc: synth-diy at node12b53.a2000.nl
>:::Subject: Re: offset adjusting
>:::Date: Fri, 20 Oct 2000 14:53:23 GMT
>:::X-OriginalArrivalTime: 20 Oct 2000 14:53:23.0422 (UTC)
>FILETIME=[7E9717E0:01C03AA5]
>:::
>:::Hi everybody...
>:::
>:::Texas Instruments has/had? some opamps that did an autocal for voltage
>:::offset on power up, and there was a way you could command an autocal
>:::after that. They were NOT choppers...
>:::
>:::If I recall, they were single supply 5V (yuck IMHO)
>:::
>:::Harley Davidson Engineer (true quote)
>:::
>:::"At Harley Davidson if we need something STRONGER, we make it BIGGER.
>:::if that makes it ugly.... we chrome it!"
>:::
>:::H^)  harry
>:::
>:::
>:::>From: Martin Czech <czech at Micronas.Com>
>:::>Reply-To: Martin Czech <czech at Micronas.Com>
>:::>To: diode at hotmail.com
>:::>CC: synth-diy at node12b53.a2000.nl
>:::>Subject: Re: offset adjusting
>:::>Date: Fri, 20 Oct 2000 09:56:07 +0200 (MET DST)
>:::>
>:::>
>:::>:::well folks, the free trade zone database finally identified some 
>nice
>:::>weird
>:::>:::chips for me from my weird chips box.. the LMC669 is apparently
>:::>:::discontinued, but there must be something out there like it.. it's 
>an
>:::>auto
>:::>:::op amp offset calibrator.. attach to the summing node and the + in 
>and
>:::>it
>:::>:::claims to auto calibrate the offset to [typ] 5uv! independent of 
>supply
>:::>:::vtg,time,temp, and req's no user offset adj. this could be the 
>solution
>:::>to
>:::>:::many a finicky vco prob! unfortunately Ive only got 1...
>:::>:::cheers,
>:::>:::dan
>:::>
>:::>chopper? Could give some nasty frequency artefacts...
>:::>
>:::>m.c.
>:::>
>:::
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