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From: "Rolf Michel"
Subject: Re: Rail to Rail Limit
Date: Fri, 27 Sep 2002 13:25:03 +0200
X-Newsreader: Microsoft Outlook Express 5.00.2615.200
Organization: Bluewin AG
The op has a dynamic load of ~2k ohm's and a load capacity of ~100pF.
i need the amplifier in a very low power application:
1. switch on the op with a fet (bss84)
2. wait for stabilize (~3ms)
3. measure the input (25 - 100mV) while 2 miliscondes. the output of the op
amplifier is direct conected to the 12 bit a/d input (msp430f436)
4. power off the amplifier
i need a four amp op. three opamp's work with the rail and one without.
thank you for your help
Kevin Aylward schrieb in im Newsbeitrag:
> "Rolf Michel" wrote in message
> > hello at all
> > how far can i use the rail to rail function of an operational
> amplifier. i
> > have 3 volt single power supply and an input signal range from 25 to
> > I'd like to gain with 25. Does this work with a rail to rail op or
> does they
> > have some distortion. (f ~ 100Hz). Who has some experience with this?
> > OP would you choose in your design? (I now there are hundreds of
> > thank you very much
> A rail-to-rail amp can swing quite near the rail without gross
> distortion. How much depends on your application, e.g. load current.
> With light loads a few 10's mv is usually doable.
> What specs do you need?
> Kevin Aylward
> SuperSpice, a very affordable Mixed-Mode
> Windows Simulator with Schematic Capture,
> Waveform Display, FFT's and Filter Design.
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