From: Joerg Hansmann (info_at_jhansmann.de)
Date: 2001-12-19 16:19:46
Hi,
----- Original Message -----
From: leyk0004 <leyk0004_at_yahoo.com>
To: <buildcheapeeg_at_yahoogroups.com>
Sent: Saturday, December 15, 2001 12:51 AM
Subject: [buildcheapeeg] Re: Necessity of ir isolation
> Hello. Sorry for an unrelated question, but i was wondering what was
> the reason for choosing INA114 for an instrumenation amplifier? For
> example, INA141 and INA129 have a 117/120db CMRR instead of 110db and
> draw less current.
Much more important than CMRR (that is reduced anyway by the
potential divider effect) and TOhms of DC-input impedance,
are noise voltage and noise current.
For G=10 and a source impedance of up to 50KOhms the INA114
showed noise of less than 1uVp-p (0.1..10Hz)
Regards,
Joerg
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