TYPICAL PERFORMANCE CURVES
At TA = +25°C, and VS = ±15V, unless otherwise noted.
TOTAL INPUT VOLTAGE NOISE vs BANDWIDTH
INPUT VOLTAGE NOISE SPECTRAL DENSITY
1k
100
10
1
p-p
Noise Bandwidth:
0.1Hz to indicated
frequency.
100
10
1
0.1
RMS
0.01
1
10
100
1k
10k
100k
1M
10M
1
10
100
1k
10k
100k
1M
10M
Bandwidth (Hz)
Frequency (Hz)
VOLTAGE NOISE vs SOURCE RESISTANCE
OPEN-LOOP GAIN vs FREQUENCY
1k
100
10
140
120
100
80
–
+
OPA637
RS
60
Comparison with
OPA27 Bipolar Op
Amp + Resistor
OPA627 + Resistor
40
OPA627
20
Spot Noise
at 10kHz
0
Resistor Noise Only
–20
1
100
1k
10k
100k
1M
10M
100M
1
10
100
1k
10k 100k 1M
10M 100M
Ω
)
Source Resistance (
Frequency (Hz)
OPA627 GAIN/PHASE vs FREQUENCY
OPA637 GAIN/PHASE vs FREQUENCY
30
20
10
0
30
–90
–90
20
10
–120
–150
–180
–210
–120
–150
–180
–210
Phase
Phase
Gain
75° Phase
Margin
Gain
0
–10
–10
1
10
100
1
10
100
Frequency (MHz)
Frequency (MHz)
®
OPA627, 637
4
BB [ BURR-BROWN CORPORATION ]
