Datasheet

®
OPA124
4
VOLTAGE AND CURRENT NOISE SPECTRAL
DENSITY vs TEMPERATURE
12
10
8
6
4
–50 –25 0 25 50 75 100 125
Temperature (°C)
100
10
1
0.1
0.01
f
O
= 1kHz
Voltage Noise (nV/√Hz)
Current Noise (fA/√Hz)
TYPICAL PERFORMANCE CURVES
At T
A
= +25°C, and V
CC
= ±15VDC, unless otherwise noted.
INPUT CURRENT NOISE SPECTRAL DENSITY
1k
Frequency (Hz)
100101 10k 100k 1M
100
10
1
0.1
Current Noise (fA/√Hz)
PB
INPUT VOLTAGE NOISE SPECTRAL DENSITY
1k
Frequency (Hz)
10k 100k 1M100101
1k
100
10
1
U, P
PB
Voltage Noise (nV/√Hz)
TOTAL
(1)
INPUT VOLTAGE NOISE SPECTRAL
DENSITY vs SOURCE RESISTANCE
100
Frequency (Hz)
1k 10k 100k1010.1
1k
100
10
1
R
S
= 10MΩ
R
S
= 1MΩ
R
S
= 100kΩ
R
S
= 100Ω
PB
NOTE: (1) Includes contribution
from source resistance.
Voltage Noise (nV/√Hz)
TOTAL
(1)
INPUT VOLTAGE NOISE (PEAK-TO-PEAK)
vs SOURCE RESISTANCE
10
1k
100
10
1
Voltage Noise (µVp-p)
NOTE: (1) Includes contribution
from source resistance.
4
Source Resistance (Ω)
10
5
10
6
10
7
10
8
10
9
10
10
PB
f
B
= 0.1Hz to 10Hz
TOTAL INPUT VOLTAGE NOISE SPECTRAL DENSITY
AT 1kHz vs SOURCE RESISTANCE
1k
100
10
1
100 1k 10k 100k 1M 10M 100M
Source Resistance ( )Ω
Resistor Noise Only
OPA124PB +
Resistor
E
O
R
S
Voltage Noise, E
O
(nV/√Hz)