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OP270GP Arkusz danych(PDF) 9 Page - Analog Devices

Numer części OP270GP
Szczegółowy opis  Dual Very Low Noise Precision Operational Amplifier
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OP270GP Arkusz danych(HTML) 9 Page - Analog Devices

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REV. C
OP270
–9–
RS – SOURCE RESISTANCE ( )
100
100
1k
10k
100k
1
10
RESISTOR
NOISE ONLY
OP200
OP270
Figure 4. Total Noise vs. Source Resistance
(Including Resistor Noise) at 10 Hz
RS – SOURCE RESISTANCE ( )
1000
100
1k
10k
100k
10
100
RESISTOR
NOISE ONLY
OP200
OP270
Figure 5. Peak-to-Peak Noise (0.1 Hz to 10 Hz) vs.
Source Resistance (Includes Resistor Noise)
Figure 5 shows peak-to-peak noise versus source resistance over the
0.1 Hz to 10 Hz range. Once again, at low values of RS, the voltage
noise of the OP270 is the major contributor to peak-to-peak
noise, with current noise the major contributor as RS increases.
The crossover point between the OP270 and the OP200 for
peak-to-peak noise is at RS =17k
W.
The OP271 is a higher speed version of the OP270, with a slew
rate of 8 V/
ms. Noise of the OP271 is slightly higher than that of
the OP270. Like the OP270, the OP271 is unity-gain stable.
For reference, typical source resistances of some signal sources
are listed in Table I.
Table I.
Source
Device
Impedance
Comments
Strain gage
<500
W
Typically used in low
frequency applications.
Magnetic
<1500
W
Low IB very important to reduce
tapehead,
self-magnetization problems
microphone
when direct coupling is used.
OP270 IB can be neglected.
Magnetic
<1500
W
Similar need for low IB in
phonograph
direct coupled applications.
cartridge
OP270 will not introduce any
self-magnetization problem.
Linear variable <1500
W
Used in rugged servo-feedback
differential
applications. Bandwidth of
transformer
interest is 400 Hz to 5 kHz.
R1
5
R2
5
OP270
DUT
+
R3
1.24k
OP27E
+
R4
200
R5
909
C1
2 F
R6
600
R8
10k
D1, D2
1N4148
OP27E
+
R9
306k
C2
0.032 F
R10
65.4k
R11
65.4k
C4
0.22 F
C3
0.22 F
OP42E
+
R12
10k
R13
5.9k
R14
4.99k
C5
1 F
eOUT
GAIN = 50,000
VS = 15V
Figure 6. Peak-to-Peak Voltage Noise Test Circuit (0.1 Hz to 10 Hz)


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