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5962-9452101MCA
Precision Picoampere Input Current Quad Operational Amplifier
REV.D
Precision Picoampere Input Current
Quad Operational Amplifier
FEATURES
Low Offset Voltage: 50 �V max
Low Offset Voltage Drift: 0.5 �V/�C max
Very Low Bias Current
25�C: 100 pA max
–55�C to +125�C: 450 pA max
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
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
Logarithmic Amplifiers
Battery-Powered Systems
GENERAL DESCRIPTIONThe OP497 is a quad op amp with precision performance in the
space-saving, industry standard 16-lead SOlC package. Its com-
bination of exceptional precision with low power and extremely
low input bias current makes the quad OP497 useful in a wide
variety of applications.
Precision performance of the OP497 includes very low offset,
under 50 µV, and low drift, below 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 the OP497’s
common-mode rejection of over 120 dB. The OP497’s power
supply rejection of over 120 dB minimizes offset voltage changes
experienced in battery-powered systems. Supply current of the
OP497 is under 625 µA per amplifier, and it can operate with
supply voltages as low as ±2 V.
The OP497 utilizes a superbeta input stage with bias current can-
cellation 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 OP497 is under 100 pA at 25°C and is under 450
pA over the military temperature range.
Combining precision, low power, and low bias current, the
OP497 is ideal for a number of applications, including instru-
mentation amplifiers, log amplifiers, photo-diode preamplifiers,
and long-term integrators. For a single device, see the OP97; for a
dual device, see the OP297.
PIN CONNECTIONS
16-Lead Wide Body SOIC
(S-Suffix)
14-Lead Plastic Dip
(P-Suffix)
14-Lead Ceramic Dip
(Y-Suffix)Input Bias, Offset Current vs. Temperature
OP497–SPECIFICATIONS(@ VS = 15 V, TA = 25�C, unless otherwise noted.)OUTPUT CHARACTERISTICS
ORDERING GUIDE*Not for new design; obsolete April 2002.
For a military processed devices, please refer to the Standard
Microcircuit Drawing (SMD) available at www.dscc.dla.mil/
programs.milspec./default.asp.
*Not for new designs; obsolete April 2002.
DICE CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS1Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .±20 V
Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 V
Differential Input Voltage2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 V
Output Short-Circuit Duration . . . . . . . . . . . . . . . .Indefinite
Storage Temperature Range
Y Package . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +175°C
P, S Package . . . . . . . . . . . . . . . . . . . . . . .–65°C to +150°C
Operating Temperature Range
OP497A, C (Y) . . . . . . . . . . . . . . . . . . . .–55°C to +125°C
OP497F, G (Y) . . . . . . . . . . . . . . . . . . . . .–40°C to +85°C
OP497F, G (P, S) . . . . . . . . . . . . . . . . . . .–40°C to +85°C
Junction Temperature
Y Package . . . . . . . . . . . . . . . . . . . . . . . .–65°C to +175°C
P, S Package . . . . . . . . . . . . . . . . . . . . . . .–65°C to +150°C
Lead Temperature Range (Soldering 60 sec) . . . . . . . . 300°C
NOTESAbsolute Maximum Ratings apply to both DICE and packaged parts, unless
otherwise noted.For supply voltages less than ±20 V, the absolute maximum input voltage is
equal to the supply voltage.HIA is specified for worst-case mounting conditions, i.e., �JA is specified for
device in socket for cerdip, P-DIP packages; �JA is specified for device soldered
to printed circuit board for SOIC package.
Channel Separation Test Circuit
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although
OP497
–Typical Performance Characteristics(25�C, Vs = 15 V, unless otherwise noted.)TPC 1.Typical Distribution of
Input Offset Voltage
TPC 4.Typical Distribution of
TCVOS
TPC 7.Input Offset Voltage
Warm-Up Drift
TPC 2.Typical Distribution of
Input Bias Current
TPC 5.Input Bias, Offset
Current vs. Temperature
TPC 8.Effective Offset Voltage
vs. Source Resistance
TPC 3.Typical Distribution of
Input Offset Current
TPC 6.Input Bias Current vs.
Common-Mode Voltage
TPC 9.Effective TCVOS vs.
Source Resistance
TPC 10.Voltage Noise Density
vs. Frequency
TPC 13.Open-Loop Gain,
Phase vs. Frequency
TPC 16.Common-Mode
Rejection vs. Frequency
TPC 11.Total Noise Density vs.
Source Resistance
TPC 14.Open-Loop Gain vs.
Load Resistance
TPC 17.Power Supply
Rejection vs. Frequency
TPC 12.0.1 Hz to 10 Hz Noise Voltage
TPC 15.Open-Loop Gain Linearity
TPC 18.Maximum Output
Swing vs. Frequency
OP497TPC 19.Input Common-Mode
Voltage Range vs. Supply Voltage
TPC 22.Supply Current
(per Amplifier) vs. Supply Voltage
TPC 25.Small-Signal Overshoot
vs. Capacitance Load
TPC 20.Maximum Output Swing
vs. Load Resistance
TPC 23.Closed-Loop Output
Impedance vs. Frequency
TPC 21.Output Voltage Swing vs.
Supply Voltage
TPC 24.Short-Circuit Current vs.
Time Temperature
TPC 26.Simplified Schematic Showing One Amplifier
