Re: opamp selector

"Winfield Hill" <Winfield_member@xxxxxxxxxxx> wrote in message
news:eeomd902b08@xxxxxxxxxxxxxxxxxx
colin wrote...

Fred Bartoli wrote...

Cheap enough to buy by the truck load? Well, it depends, but the
OPA228/2228 will fit the bill on all your other criteria.

Yes thanks that looks quite good, 1 quid from Farnell, only problem is
its minimum gain of 5, the opa227 is unity gain stable but only 8mhz,

The opa2277 dual is a grand part, and the A version is much cheaper
than the LT1124 I've been using.* I see all the distributors have
plenty of the miniDIP package in stock, but are sold out of the soic
package, so I'll have to stick with the LT1124 for now. For example,
Mouser shows 1,200 on order but with a 11/27/2006 Estimated Ship Date.
TI's site shows the opa2277ua with >10k in process for next 29 Jan.
Yep, a popular part, insufficiently produced and badly backed up.

* The OPA2277 is spec'd at 3nV noise, whereas the LT1124 is 2.7nV,
which is 10% better! Guess that's why LTC gets the big bucks. :-)

thanks, Farnell have the single in stock but not the dual 2228,
Ive found a faster part ad8034, only 24v but single supply rail to rail op.
shame about the input diodes .. maybe you might not like the higher noise
but still good enough for my app.

Colin =^.^=


.

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