OP297FSZ Analog Devices Inc, OP297FSZ Datasheet - Page 11

• Manufacturer Part Number: OP297FSZ
• Description: IC OPAMP GP 500KHZ DUAL 8SOIC
• Manufacturer: Analog Devices Inc
• Type: General Purpose Amplifierr

Specifications of OP297FSZ

• Slew Rate: 0.15 V/µs
• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Gain Bandwidth Product: 500kHz
• Current - Input Bias: 35pA
• Voltage - Input Offset: 50µV
• 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)
• Op Amp Type: Precision
• No. Of Amplifiers: 2
• Bandwidth: 500kHz
• Supply Voltage Range: ± 2V To ± 20V
• Amplifier Case Style: SOIC
• No. Of Pins: 8
• Channel Separation: 150
• Common Mode Rejection Ratio: 135
• Current, Input Bias: ±35 pA
• Current, Input Offset: 35 pA
• Current, Supply: 525 μA
• Impedance, Thermal: 41 °C/W
• Number Of Amplifiers: Dual
• Package Type: SOIC-8
• Resistance, Input: 30 Megohms (Differential), 500 Gigaohms (Common-Mode)
• Temperature, Operating, Range: -40 to +85 °C
• Voltage, Gain: 3200 V/mV
• Voltage, Input: ±14 V (Common-Mode)
• Voltage, Noise: 20 nV/sqrt Hz
• Voltage, Offset: 50 μV
• Voltage, Output, High: +14 V
• Voltage, Output, Low: -14 V
• Voltage, Supply: ±15 V
• Rail/rail I/o Type: No
• Number Of Elements: 2
• Unity Gain Bandwidth Product: 0.5MHz
• Input Offset Voltage: 100uV
• Input Bias Current: 150pA
• 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
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Output Type: -
• Current - Output / Channel: -
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

APPLICATION CIRCUITS
PRECISION ABSOLUTE VALUE AMPLIFIER
The circuit in Figure 31 is a precision absolute value amplifier
with an input impedance of 30 MΩ. The high gain and low
TCV
input signals. In this circuit, the input always appears as a
common-mode signal to the op amps. The CMR of the OP297
exceeds 120 dB, yielding an error of less than 2 ppm.
V
PRECISION CURRENT PUMP
Maximum output current of the precision current pump shown
in Figure 32 is ±10 mA. Voltage compliance is ±10 V with
±15 V supplies. Output impedance of the current transmitter
exceeds 3 MΩ with linearity better than 16 bits. R1 through R4
should be matched resistors.
IN
V
OS
IN
of the OP297 ensure accurate operation with microvolt
2
3
–
+
OP297
10kΩ
10kΩ
+15V
–15V
R2
R1
1/2
8
4
Figure 31. Precision Absolute Value Amplifier
0.1µF
0.1µF
C2
30pF
C3
10kΩ
C1
2
3
R4
Figure 32. Precision Current Pump
1
–
OP297
+
10kΩ
1/2
R3
7
OP297
+15V
–15V
1/2
1
D1
1N4148
1N4148
8
1kΩ
100kΩ
R1
D2
+
–
R5
5
6
I
OUT
R2
2kΩ
5
6
–
+
OP297
=
1/2
V
R5
1kΩ
IN
R3
=
I
10mA MAX
100Ω
OUT
V
IN
0V < V
7
= 10mA/V
OUT
< 10V
Rev. G | Page 11 of 16
PRECISION POSITIVE PEAK DETECTOR
In Figure 33, the C
polyethylene to minimize dielectric absorption and leakage.
The droop rate is determined by the size of C
current of the OP297.
SIMPLE BRIDGE CONDITIONING AMPLIFIER
Figure 34 shows a simple bridge conditioning amplifier using
the OP297. The transfer function is
The
the bridge. To maintain the highest circuit accuracy, R
be 0.1% or better with a low temperature coefficient.
V
IN
REF43
1kΩ
REF43
V
15V
Figure 34. Simple Bridge Condition Amplifier Using the OP297
OUT
4
2
3
RESET
–
OP297
+
=
provides an accurate and stable reference voltage for
1/2
V
REF
Figure 33. Precision Positive Peak Detector
⎛
⎜
⎝
H
6
5
R
1
V
must be of polystyrene, Teflon®, or
REF
Δ
–
OP297
+
+
1kΩ
R
1/2
Δ
1N4148
R
R + ΔR
8
4
⎞
⎟
⎠
R
R
F
C
7
H
1kΩ
2N930
1kΩ
V
OUT
2
3
+
–
OP297
6
5
= V
1/2
–
OP297
+
–15V
+15V
REF
1/2
R
F
H
0.1µF
0.1µF
R + ΔR
and the bias
ΔR
1
7
R
R
F
OP297
F
V
OUT
should
V
OUT