OP227 Datasheet, PDF (6/16 Pages) Analog Devices – Dual, Low Noise, Low Offset Instrumentation Operational Amplifier

OP227–Typical Performance Characteristics
0.1␮F
10⍀
100k⍀
D.U.T.
2k⍀
5␮F
VOLTAGE GAIN
= 50,000
BACK-TO-BACK
47␮F
OP12
4.3k⍀
23.5␮F
100k⍀ 2.35␮F
SCOPE
X1
R_IN = 1M⍀
0.1␮F
24.3k⍀
110k⍀
120
100
80 90
40
0
–40
–80 10
0%
–120
1 SEC / DIV
BACK-TO-BACK
10␮F
BACK-TO-BACK
4.7␮F
TPC 1. Voltage Noise Test Circuit
(0.1 Hz to 10 Hz p-p)
0.1Hz TO 10Hz PEAK-TO-PEAK NOISE
TPC 2. Low Frequency Noise
(Observation Must Be Limited to 10
Seconds to Ensure 0.1 Hz Cutoff)
10
9
8
7
6
5
4
3
l/f CORNER
2 ^{= 2.7Hz}
T_A = 25؇C
V_S = ؎15V
100
10
741
1
l/f CORNER
LOW NOISE
10
AUDIO
l/f CORNER
OP AMP
2.7 Hz
l/f CORNER
OP227
0.1
T_A = 25؇C
VS = ؎15V
1
1
10
100
1k
FREQUENCY – Hz
TPC 3. Voltage Noise Density vs.
Frequency
INSTRUMENTATION AUDIO RANGE
10
RANGE,TO DC TO 20 kHz
1
10
100
1k
FREQUENCY – Hz
TPC 4. Comparison of Op Amp Voltage
Noise Spectra
0.01
100
1k
10k
BANDWIDTH – Hz
100k
TPC 5. Input Wideband Noise vs. Band-
width (0.1 Hz to Frequency Indicated)
100
T_A = 25؇C
V_S = ؎15V
R1
R2
R_S = 2R1
10
AT 10Hz
AT 1kHZ
RESISTOR NOISE ONLY
1
100
1k
10k
SOURCE RESISTANCE – ⍀
TPC 6. Total Noise vs. Source
Resistance
5
V_S = ؎15V
4
AT 10Hz
3
AT 1kHz
2
1
–50 –25
0 25 50 75 100 125
TEMPERATURE – ؇C
TPC 7. Voltage Noise Density vs.
Temperature
10.0
1.0
l/f CORNER
= 140Hz
0.1
10
100
1k
10k
FREQUENCY – Hz
TPC 8. Current Noise Density vs.
Frequency
–6–
REV. A