Dagmar,

I use AD623 before very nice op. My suggestion is replace your resistor (ga=
in)
with 20k pot " for test only" and keep turning until it started working =

properly. it looks like gain issue with INA126 you do not have enough gain.

Andre Abelian


-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu]On Behalf
Of Dagmar C. Neto
Sent: Thursday, November 08, 2007 10:02 AM
To: piclist@mit.edu
Subject: [EE] INA126 high offset problem


	Hi all, =

	I'm using the AD623 instrumentation amplifier to measure signal from a bri=
dge =

pressure transducer, and would like to replace it with the INA126 that have=
 a much smaller =

quiescent current (175uA, against 500uA from AD623). However, it shows a hi=
gh offset =

voltage value at output (500mV), what leads to a very large voltage "dead b=
and" - small =

signals from sensor don't show at output until its amplification overcome t=
his 0.5V value. I =

don't have any of these problems with AD623.
	Anyone know what could be happen? In both amplifiers the REF input (pin 5)=
 is =

grounded. The gain is set around 80 (1-1.2kohm gain resistor).
	Thank you all, =


		Best regards,

			Dagmar

-- =

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