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PDF INA145 Data sheet ( Hoja de datos )
| Número de pieza | INA145 | |
| Descripción | Programmable Gain DIFFERENCE AMPLIFIER | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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®
INA145
INA145
For most current data sheet and other product
information, visit www.burr-brown.com
Programmable Gain
DIFFERENCE AMPLIFIER
FEATURES
q DIFFERENTIAL GAIN = 1V/V TO 1000V/V:
Set with External Resistors
q LOW QUIESCENT CURRENT: 570µA
q WIDE SUPPLY RANGE:
Single Supply: 4.5V to 36V
Dual Supplies: ±2.25V to ±18V
q HIGH COMMON-MODE VOLTAGE:
+8V at VS = +5V
±28V at VS = ±15V
q LOW GAIN ERROR: 0.01%
q HIGH CMR: 86dB
q SO-8 PACKAGE
APPLICATIONS
q CURRENT SHUNT MEASUREMENTS
q SENSOR AMPLIFIER
q DIFFERENTIAL LINE RECEIVER
q BATTERY POWERED SYSTEMS
DESCRIPTION
The INA145 is a precision, unity-gain difference
amplifier consisting of a precision op amp and on-
chip precision resistor network. Two external resistors
set the gain from 1V/V to 1000V/V. The input com-
mon-mode voltage range extends beyond the positive
and negative rails.
On-chip precision resistors are laser-trimmed to achieve
accurate gain and high common-mode rejection. Ex-
cellent TCR tracking of these resistors assures contin-
ued high precision over temperature.
The INA145 is available in the SO-8 surface-mount
package specified for the extended industrial tempera-
ture range, –40°C to +85°C.
VIN– 2
VIN+ 3
V+
R1
40kΩ
7
R2
40kΩ
G=1
R3
40kΩ
A1
R4
40kΩ
4
V–
RG1
RG2
RG 5
R5
10kΩ
(1%)
A2 6 VO
VO = (VI+N – VI–N)(1 + RG2/RG1)
INA145
18
Ref V01
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 • Internet: http://www.burr-brown.com/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1999 Burr-Brown Corporation
PDS-11567B
INA145Printed in U.S.A. March, 2000
®
1 page  
TYPICAL PERFORMANCE CURVES
At TA = +25°C, VS = ±15V, G = 1, RL = 10kΩ connected to ground and Ref pin connected to ground, unless otherwise noted.
60
40
20
0
–20
100
GAIN vs FREQUENCY
G = 100
VS = ±15V
CL = 1000pF
G = 10
G=1
1K
10K 100K
1M
10M
Frequency (Hz)
60
40
20
0
–20
100
GAIN vs FREQUENCY
G = 100
VS = ±15V
CL = 200pF 10kΩ
G = 10
G=1
1K 10K 100K 1M 10M
Frequency (Hz)
COMMON-MODE REJECTION vs FREQUENCY
100
80
60
40
20
0
10 100 1k 10k 100k 1M 10M
Frequency (Hz)
POWER SUPPLY REJECTION vs FREQUENCY
100
PSR+
(VS = ±15V)
80
PSR+
60 (VS = +5V)
40
20
0
1
PSR–
(VS = ±15V)
10 100 1k 10k 100k
Frequency (Hz)
INPUT VOLTAGE NOISE DENSITY
1k
G=1
100
G = 100
G = 10
10
0.1 1 10 100 1k 10k 100k
Frequency (Hz)
0.1Hz to 10Hz VOLTAGE NOISE (RTI)
500ms/div
®
5 INA145
5 Page 
For sense resistors (RS)
greater than 5Ω, use
series compensation
resistor (RC) for good
common-mode rejection.
Sense resistors greater
than 200Ω are not
recommended.
Power
Supply
RC
10Ω
RS
10Ω
Load
2
3
FIGURE 7. Current Monitor, G = 1.
RG1
11kΩ
RG2
100kΩ
5
G = 10
VO
6
INA145
18
VO1
24V
2
SHUNT
R-I Lamp/10
e.g., 0.1Ω for 1A
3
Lamp
+5V
Feedback
8.4kΩ
75
41
VO
6
1V – 50mV
INA145
8
10MΩ
8kΩ
10kΩ
1V
2kΩ
FIGURE 8. Comparator Output with Optional Hysteresis Application to Sense Lamp Burn-Out.
VI–N 2
RG1
11kΩ
RG2
100kΩ
5
6
VO
VI+N 3
1
Pole at
f = 1 = 1.6Hz
2πR1RC
INA145
8
C1
0.1µF
R1
1MΩ
OPA277
VI–N 2
VI+N 3
RG2
10kΩ
5
10kΩ
6
VO
INA145
18
IOUT = (VI+N – VI–N)/10kΩ
FIGURE 9. AC Coupling (DC Restoration).
FIGURE 10. Precision Current Source.
11 INA145
®
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet INA145.PDF ] | |
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