[sdiy] Op-amps CA3140 v. TL074

[Neil Johnson]

Hi,

Ian Fritz wrote:

> At 01:51 PM 7/30/2010, Neil Johnson wrote:
>
>> The TLC272 single-rail op-amp does rather well too - at least on
>> paper lower than the CA3140's input bias current by a good factor of
>> ten.  Maybe the "single-supply" puts many people off?
>> And very cheap as well.
>
> Well, the max V_DD of 18V certainly puts me off.  Note also that  
> the input bias current is specified with a 5V supply.


Or check the next page which gives figures for VDD=10V.  The input  
bias current goes up to 0.7pA typ ay 25C.  At higher VDD (e.g., 12V  
or 15V) I would expect further increases, perhaps to around 1pA or so  
(typ).

Neil
--
http://www.njohnson.co.uk