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Número de pieza | OPA2111 | |
Descripción | Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER | |
Fabricantes | Burr-Brown | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de OPA2111 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
No Preview Available ! ® 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 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 = 10MΩ
RS = 1MΩ
100
RS = 100kΩ
BM
10
NOTE: (1) Includes contribution
from source resistance.
RS = 100Ω
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 (Ω)
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 IB = ±4pA max
1/2 OPA2111BM
3
Gain = 100
–In
2
1
CMRR ≈ 106dB
RIN ≈ 1013Ω
RF
5kΩ 2 25kΩ
25kΩ
5
RG
101Ω
RF
5kΩ
25kΩ
3
6
Output
1/2 OPA2111BM
6
25kΩ
Burr-Brown
INA105
7 Differential
5 Amplifier
1
+In Differential Voltage Gain = 1 + 2RF/RG
FIGURE 9. FET Input Instrumentation Amplifier.
10kΩ
Input
≈10pF
(1)
IN914
1/2
2 OPA2111AM
1
3
1MΩ
(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.
6.3MΩ
944kΩ
6.3MΩ
7.8MΩ
1.6MΩ
In
1.6MΩ
0.01µF
NPO
2
1
1/2 OPA2111
3
1.6MΩ
1.6MΩ
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
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet OPA2111.PDF ] |
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