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OP497GPZ1

更新时间： 2024-11-04 12:05:11
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亚德诺 - ADI 运算放大器
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16页 322K
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Precision Picoampere Input Current Quad Operational Amplifier

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Precision Picoampere Input Current  
Quad Operational Amplifier  
OP497  
FEATURES  
PIN CONNECTIONS  
1
Low offset voltage: 75 μV maximum  
Low offset voltage drift: 1.0 μV/°C maximum  
Very low bias current  
25°C: 150 pA maximum  
−40°C to +85°C: 300 pA maximum  
Very high open-loop gain: 2000 V/mV minimum  
Low supply current (per amplifier): 625 μA maximum  
Operates from 2 V to 20 V supplies  
High common-mode rejection: 114 dB minimum  
16  
OUT A  
–IN A  
+IN A  
V+  
OUT D  
–IN D  
+IN D  
V–  
2
3
4
5
6
7
8
15  
14  
13  
12  
11  
10  
9
OP497  
+IN B  
–IN B  
OUT B  
NC  
+IN C  
–IN C  
OUT C  
NC  
NC = NO CONNECT  
Figure 1. 16-Lead Wide Body SOIC (RW-16)  
APPLICATIONS  
1
2
3
4
5
6
7
OUT A  
–IN A  
+IN A  
V+  
14  
13  
12  
11  
10  
9
OUT D  
–IN D  
+IN D  
V–  
Strain gage and bridge amplifiers  
High stability thermocouple amplifiers  
Instrumentation amplifiers  
Photocurrent monitors  
High gain linearity amplifiers  
Long-term integrators/filters  
Sample-and-hold amplifiers  
Peak detectors  
OP497  
+IN B  
–IN B  
OUT B  
+IN C  
–IN C  
OUT C  
8
Figure 2. 14-Lead PDIP (N-14)  
1k  
Logarithmic amplifiers  
V
V
= ±15V  
S
= 0V  
CM  
Battery-powered systems  
GENERAL DESCRIPTION  
The OP497 is a quad op amp with precision performance in  
the space-saving, industry standard 16-lead SOlC package.  
Its combination of exceptional precision with low power and  
extremely low input bias current makes the quad OP497 useful  
in a wide variety of applications.  
100  
–I  
B
+I  
B
Precision performance of the OP497 includes very low offset  
(<50 μV) and low drift (<0.5 μV/°C). Open-loop gain exceeds  
2000 V/mV ensuring high linearity in every application. Errors  
due to common-mode signals are eliminated by its common-  
mode rejection of >120 dB. The OP497 has a power supply  
rejection of >120 dB which minimizes offset voltage changes  
experienced in battery-powered systems. The supply current  
of the OP497 is <625 μA per amplifier, and it can operate with  
supply voltages as low as 2 V.  
I
OS  
10  
–75  
–50  
–25  
0
25  
50  
75  
100  
125  
TEMPERATURE (°C)  
Figure 3. Input Bias, Offset Current vs. Temperature  
Combining precision, low power, and low bias current, the OP497  
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 data sheet,  
and for a dual device, see the OP297 data sheet.  
The OP497 uses a superbeta 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.  
The input bias current of the OP497 is <100 pA at 25°C.  
Rev. E  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
www.analog.com  
Fax: 781.461.3113 ©1991–2009 Analog Devices, Inc. All rights reserved.  
 
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