Datasheet

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