OP297GS Analog Devices Inc, OP297GS Datasheet - Page 9

IC OPAMP GP 500KHZ DUAL 8SOIC

OP297GS

Manufacturer Part Number
OP297GS
Description
IC OPAMP GP 500KHZ DUAL 8SOIC
Manufacturer
Analog Devices Inc
Type
General Purpose Amplifierr
Datasheet

Specifications of OP297GS

Slew Rate
0.15 V/µs
Rohs Status
RoHS non-compliant
Amplifier Type
General Purpose
Number Of Circuits
2
Gain Bandwidth Product
500kHz
Current - Input Bias
50pA
Voltage - Input Offset
80µV
Current - Supply
525µA
Voltage - Supply, Single/dual (±)
4 V ~ 40 V, ±2 V ~ 20 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
No. Of Amplifiers
2
Bandwidth
500kHz
No. Of Pins
8
Operating Temperature Range
0°C To +70°C
Peak Reflow Compatible (260 C)
No
Input Bias Current
0.2nA
Rail/rail I/o Type
No
Number Of Elements
2
Unity Gain Bandwidth Product
0.5MHz
Common Mode Rejection Ratio
114dB
Input Offset Voltage
200uV
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
±3/±5/±9/±12/±15/±18V
Voltage Gain In Db
130.1dB
Power Supply Rejection Ratio
114dB
Power Supply Requirement
Dual
Shut Down Feature
No
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
±2V
Dual Supply Voltage (max)
±20V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Output Type
-
Current - Output / Channel
-
-3db Bandwidth
-
Lead Free Status / Rohs Status
Not Compliant

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APPLICATIONS INFORMATION
Extremely low bias current over a wide temperature range
makes the OP297 attractive for use in sample-and-hold
amplifiers, peak detectors, and log amplifiers that must operate
over a wide temperature range. Balancing input resistances is
unnecessary with the OP297. Offset voltage and TCV
degraded only minimally by high source resistance, even
when unbalanced.
The input pins of the OP297 are protected against large differen-
tial voltage by back-to-back diodes and current-limiting resistors.
Common-mode voltages at the inputs are not restricted and can
vary over the full range of the supply voltages used.
The OP297 requires very little operating headroom about the
supply rails and is specified for operation with supplies as low as
2 V. Typically, the common-mode range extends to within 1 V
of either rail. The output typically swings to within 1 V of the
rails when using a 10 kΩ load.
AC PERFORMANCE
The ac characteristics of the OP297 are highly stable over its full
operating temperature range. Unity gain small signal response is
shown in Figure 26. Extremely tolerant of capacitive loading on
the output, the OP297 displays excellent response with 1000 pF
loads (see Figure 27).
Figure 27. Small Signal Transient Response (C
Figure 26. Small Signal Transient Response (C
100
100
0%
0%
90
10
90
10
10
20mV
20mV
L
L
5µs
5µs
= 1000 pF, A
= 100 pF, A
VCL
VCL
OS
= +1)
= +1)
are
Rev. G | Page 9 of 16
GUARDING AND SHIELDING
To maintain the extremely high input impedances of the OP297,
care is taken in circuit board layout and manufacturing. Board
surfaces must be kept scrupulously clean and free of moisture.
Conformal coating is recommended to provide a humidity
barrier. Even a clean PCB can have 100 pA of leakage currents
between adjacent traces, therefore guard rings should be used
around the inputs. Guard traces operate at a voltage close to that
on the inputs, as shown in Figure 29, to minimize leakage
currents. In noninverting applications, the guard ring should be
connected to the common-mode voltage at the inverting input.
In inverting applications, both inputs remain at ground, so the
guard trace should be grounded. Guard traces should be placed
on both sides of the circuit board.
UNITY-GAIN FOLLOWER
INVERTING AMPLIFIER
100
90
0%
10
Figure 28. Large Signal Transient Response (A
+
OP297
Figure 29. Guard Ring Layout and Considerations
1/2
+
OP297
20mV
1/2
B
8
NONINVERTING AMPLIFIER
BOTTOM VIEW
5µs
MINI-DIP
OP297
+
VCL
1/2
= +1)
OP297
1
A

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