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PDF OPA2111 Data sheet ( Hoja de datos )

Número de pieza OPA2111
Descripción Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER
Fabricantes Burr-Brown 
Logotipo Burr-Brown Logotipo



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No Preview Available ! OPA2111 Hoja de datos, Descripción, Manual

® OPA2111
Dual Low Noise Precision
Difet ® OPERATIONAL AMPLIFIER
FEATURES
q LOW NOISE: 100% Tested, 8nV/Hz max at
10kHz
q LOW BIAS CURRENT: 4pA max
q LOW OFFSET: 500µV max
q LOW DRIFT: 2.8µV/°C
q HIGH OPEN-LOOP GAIN: 114dB min
q HIGH COMMON-MODE REJECTION:
96dB min
APPLICATIONS
q PRECISION INSTRUMENTATION
q DATA ACQUISITION
q TEST EQUIPMENT
q PROFESSIONAL AUDIO EQUIPMENT
q MEDICAL EQUIPMENT
q DETECTOR ARRAYS
DESCRIPTION
The OPA2111 is a high precision monolithic
dielectrically isolated FET (Difet ) operational ampli-
fier. Outstanding performance characteristics allow its
use in the most critical instrumentation applications.
Noise, bias current, voltage offset, drift, open-loop
gain, common-mode rejection, and power supply re-
jection are superior to BIFET® amplifiers.
Very low bias current is obtained by dielectric isola-
tion with on-chip guarding.
Laser trimming of thin-film resistors gives very low
offset and drift. Extremely low noise is achieved with
patented circuit design techniques. A cascode design
allows high precision input specifications and reduced
susceptibility to flicker noise.
Standard dual op amp pin configuration allows up-
grading of existing designs to higher performance
levels.
BIFET® National Semiconductor Corp., Difet® Burr-Brown Corp.
+VCC
8
–In
+In Noise-Free
Cascode*
Output
*Patented
OPA2111 Simplified Circuit
(Each Amplifier)
–VCC
4
International Airport Industrial Park • Mailing Address: PO Box 11400 • Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd. • Tucson, AZ 85706
Tel: (520) 746-1111 • Twx: 910-952-1111 • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
© 1984 Burr-Brown Corporation
PDS-540E
Printed in U.S.A. October, 1993

1 page




OPA2111 pdf
TYPICAL PERFORMANCE CURVES (CONT)
TA = +25°C, and VCC = ±15VDC unless otherwise noted.
TOTAL(1) INPUT VOLTAGE NOISE SPECTRAL
DENSITY vs SOURCE RESISTANCE
1k
RS = 10M
RS = 1M
100
RS = 100k
BM
10
NOTE: (1) Includes contribution
from source resistance.
RS = 100
1
0.1 1 10 100 1k 10k 100k
Frequency (Hz)
INPUT OFFSET VOLTAGE WARM-UP DRIFT
40
20
0
–20
–40
0
12345
Time From Power Turn-On (Minutes)
6
INPUT VOLTAGE NOISE SPECTRAL DENSITY
1k
100
AM, SM
BM
10
1
1 10 100 1k 10k 100k 1M
Frequency (Hz)
TOTAL(1) INPUT VOLTAGE NOISE (PEAK-TO-PEAK)
vs SOURCE RESISTANCE
1k
NOTE: (1) Includes contribution
from source resistance.
100
10 BM
fB = 0.1Hz to 10Hz
1
10 4 10 5 10 6 10 7 10 8 10 9 10 10
Source Resistance ()
BIAS AND OFFSET CURRENT
vs TEMPERATURE
1k 1k
100 100
10 10
11
0.1 0.1
0.01
–50
–25
0 25 50 75
Ambient Temperature (°C)
0.01
100 125
140
120
100
80
60
40
20
0
1
POWER SUPPLY REJECTION
vs FREQUENCY
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
®
5 OPA2111

5 Page





OPA2111 arduino
IB = ±4pA max
1/2 OPA2111BM
3
Gain = 100
–In
2
1
CMRR 106dB
RIN 1013
RF
5k2 25k
25k
5
RG
101
RF
5k
25k
3
6
Output
1/2 OPA2111BM
6
25k
Burr-Brown
INA105
7 Differential
5 Amplifier
1
+In Differential Voltage Gain = 1 + 2RF/RG
FIGURE 9. FET Input Instrumentation Amplifier.
10k
Input
10pF
(1)
IN914
1/2
2 OPA2111AM
1
3
1M
(1)
(1)
IN914
2N4117A
NOTE: (1) Reverse polarity for
negative peak detection.
1/2
6 OPA2111AM
7
5
Output
Droop 0.5mV/s
0.01µF
Polystyrene
FIGURE 10. Low-Droop Positive Peak Detector.
6.3M
944k
6.3M
7.8M
1.6M
In
1.6M
0.01µF
NPO
2
1
1/2 OPA2111
3
1.6M
1.6M
0.01µF
NPO
0.01µF
NPO
6
7
1/2 OPA2111
5
Out
0.01µF
NPO
NOTE: Lower value resistors will have lower
thermal noise but capacitors must
be scaled larger.
FIGURE 11. 10Hz Fourth-Order Butterworth Low-Pass Filter.
AV = 2.6
fO = 10Hz
–24dB/Octave
®
11 OPA2111

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