OP27
TYPICAL PERFORMANCE CHARACTERISTICS
100
90
80
RMS VOLTAGE NOISE (μV)
10
T
A
= 25°C
V
S
=
±15V
1
GAIN (dB)
70
60
50
40
30
0.01
TEST TIME OF 10sec FURTHER
LIMITS LOW FREQUENCY
(<0.1Hz) GAIN
00317-004
0.1
0.1
1
FREQUENCY (Hz)
10
100
1k
BANDWIDTH (Hz)
10k
100k
Figure 4. 0.1 Hz to 10 Hz p-p Noise Tester Frequency Response
Figure 7. Input Wideband Voltage Noise vs. Bandwidth (0.1 Hz to Frequency
Indicated)
100
T
A
= 25°C
V
S
=
±15V
R1
R2
R
S
– 2R1
10
9
8
7
VOLTAGE NOISE (nV/√Hz)
6
5
4
3
I/F CORNER = 2.7Hz
T
A
= 25°C
V
S
=
±15V
TOTAL NOISE (nV/√Hz)
10
AT 10Hz
AT 1kHz
RESISTOR NOISE ONLY
2
1
10
FREQUENCY (Hz)
100
1k
00317-005
1k
SOURCE RESISTANCE (Ω)
10k
Figure 5. Voltage Noise Density vs. Frequency
100
741
VOLTAGE NOISE (nV/√Hz)
5
Figure 8. Total Noise vs. Sourced Resistance
V
S
=
±15V
VOLTAGE NOISE (nV/√Hz)
4
AT 10Hz
I/F CORNER
10
I/F CORNER = 2.7Hz
OP27 I/F CORNER
LOW NOISE
AUDIO OP AMP
3
AT 1kHz
2
INSTRUMENTATION
RANGE TO DC
1
1
10
FREQUENCY (Hz)
AUDIO RANGE
TO 20kHz
00317-006
100
1k
–25
0
25
50
75
100
125
TEMPERATURE (°C)
Figure 6. A Comparison of Op Amp Voltage Noise Spectra
Figure 9. Voltage Noise Density vs. Temperature
Rev. F | Page 8 of 20
00317-009
1
–50
00317-008
1
1
100
00317-007
0.01
100
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