Re: TL082 opamp input range?


"SioL" <Sio_spam_L@xxxxxxxx> wrote in message
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<jpopelish@xxxxxxxx> wrote in message
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D. G. wrote:

Working with 9V supply. The signal is normally biased at 4.5V but can go
lower by design to shift the DC level at output. I just checked with a
LM358
(got one in my stock :)
According to data***, slew rate is about 0.2V/uS. A 50KHz cycle is
only
20uS so I feared it was too slow and... it is.
The wave form looks more like triangular.
May be I must stick with FET or MOSFET input to get a reasonnably higher
slew rate (5V/uS min) and low input bias (<100nA)

I just remembered a primitive CMOS output, MOS input opamp. It is only
about half as fast as the TL082, but its inputs and output work to the
negative rail.
http://www.intersil.com/cda/deviceinfo/0,1477,CA3260A,00.html#data

Not available in smd as well.

Is there a cheap rail-to-rail dual opamp that'll do 15V min and be
available in
so8?

Ups, some googling just turned up tlc272, this might do it.


TLC272 sounds interesting. Rail-to-rail output, input down to negative rail.
But does it also "suffer" from phase reversal ?

Dan


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