OPA27CZ Datasheet, PDF (5/22 Pages) Texas Instruments – Ultra-Low Noise, Precision OPERATIONAL AMPLIFIERS

TYPICAL CHARACTERISTICS
At T_A = +25°C, ±V_CC = ±15VDC, unless otherwise noted.
INPUT OFFSET VOLTAGE WARM-UP DRIFT
+10
+5
0
–5
–10
0
1
2
3
4
5
6
Time From Power Turn-On (min)
TOTAL INPUT VOLTAGE NOISE SPECTRAL DENSITY
vs SOURCE RESISTANCE
100
80
60
R₁
40
-
+
20
R₁
10
R_SOURCE = 2 x R₁
8
6
10Hz
4
1kHz
2
Resistor Noise Only
1
100
1k
10k
Source Resistance (Ω)
VOLTAGE NOISE SPECTRAL DENSITY
vs TEMPERATURE
5
10Hz
4
3
1kHz
2
1
–75 –50 –25 0 +25 +50 +75 +100 +125
Ambient Temperature (°C)
INPUT VOLTAGE NOISE vs NOISE BANDWIDTH
(0.1Hz to Indicated Frequency)
10
1
0.1
0.01
100
R_S = 0 Ω
1k
10k
Noise Bandwidth (Hz)
100k
VOLTAGE NOISE SPECTRAL DENSITY
vs SUPPLY VOLTAGE
5
10Hz
4
3
1kHz
2
1
0
±5
±10
±15
±20
Supply Voltage (V_CC )
10
8
6
4
2
1
0.8
0.6
0.4
0.2
0.1
10
INPUT CURRENT NOISE SPECTRAL DENSITY
Current Noise Test Circuit
100kΩ 500kΩ ^10kΩ
e_no
DUT
500kΩ
I_n = √(e_no)² – (130nV)²
1M Ω x 100
Warning: This industry-standard equation
is inaccurate and these figures should
be used for comparison purposes only!
100
1k
10k
Frequency (Hz)
OPA27, OPA37
5
SBOS135C
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