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OP297_03

更新时间： 2024-11-04 04:11:47
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Dual Low Bias Current Precision Operational Amplifier

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Dual Low Bias Current  
Precision Operational Amplifier  
OP297  
FEATURES  
PIN CONNECTIONS  
Low Offset Voltage: 50 ␮V Max  
Low Offset Voltage Drift: 0.6 ␮V/؇C Max  
Very Low Bias Current: 100 pA Max  
1
2
3
4
8
7
6
5
V+  
OUTA  
–INA  
+INA  
V–  
OUTB  
–INB  
+INB  
A
B
Very High Open-Loop Gain: 2000 V/mV Min  
Low Supply Current (Per Amplifier): 625 ␮A Max  
Operates From ؎2 V to ؎20 V Supplies  
High Common-Mode Rejection: 120 dB Min  
Pin Compatible to LT1013, AD706, AD708, OP221,  
LM158, and MC1458/1558 with Improved Performance  
Precision performance of the OP297 includes very low offset,  
under 50 µV, and low drift, below 0.6 µV/°C. Open-loop gain  
exceeds 2000 V/mV, ensuring high linearity in every application.  
APPLICATIONS  
Strain Gage and Bridge Amplifiers  
High Stability Thermocouple Amplifiers  
Instrumentation Amplifiers  
Photo-Current Monitors  
High Gain Linearity Amplifiers  
Long-Term Integrators/Filters  
Sample-and-Hold Amplifiers  
Peak Detectors  
Errors due to common-mode signals are eliminated by the  
OP297’s common-mode rejection of over 120 dB, which mini-  
mizes offset voltage changes experienced in battery-powered  
systems. Supply current of the OP297 is under 625 µA per  
amplifier, and the part can operate with supply voltages as low  
as 2 V.  
Logarithmic Amplifiers  
Battery-Powered Systems  
The OP297 uses a super-beta input stage with bias current  
cancellation to maintain picoamp bias currents at all temperatures.  
This is in contrast to FET input op amps whose bias currents  
start in the picoamp range at 25°C, but double for every 10°C  
rise in temperature, to reach the nanoamp range above 85°C.  
Input bias current of the OP297 is under 100 pA at 25°C and is  
under 450 pA over the military temperature range.  
GENERAL DESCRIPTION  
The OP297 is the first dual op amp to pack precision performance  
into the space-saving, industry-standard, 8-lead SOIC package.  
Its combination of precision with low power and extremely low  
input bias current makes the dual OP297 useful in a wide variety  
of applications.  
Combining precision, low power, and low bias current, the OP297  
is ideal for a number of applications, including instrumentation  
amplifiers, log amplifiers, photodiode preamplifiers, and long-  
term integrators. For a single device, see the OP97; for a quad,  
see the OP497.  
60  
V
V
= ؎15V  
S
400  
= 0V  
CM  
1200 UNITS  
T
= 25؇C  
A
40  
20  
0
V
= ؎15V  
= 0V  
S
V
CM  
300  
200  
100  
0
I –  
B
I +  
B
–20  
–40  
–60  
I
OS  
–75  
–50  
–25  
0
25  
50  
75  
100  
125  
TEMPERATURE (؇C)  
–100 –80 –60 –40  
–20  
0
20  
40  
60  
80 100  
INPUT OFFSET VOLTAGE (␮V)  
Figure 1. Low Bias Current over Temperature  
REV. E  
Figure 2. Very Low Offset  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat  
may result from its use. No license is granted by implication or otherwise  
under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective companies.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
www.analog.com  
© 2003 Analog Devices, Inc. All rights reserved.  
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