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Número de pieza | INA121P | |
Descripción | FET-Input/ Low Power INSTRUMENTATION AMPLIFIER | |
Fabricantes | Burr-Brown Corporation | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de INA121P (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
No Preview Available ! ® INA121
INA121
INA121
FET-Input, Low Power
INSTRUMENTATION AMPLIFIER
FEATURES
DESCRIPTION
q LOW BIAS CURRENT: ±4pA
q LOW QUIESCENT CURRENT: ±450µA
q LOW INPUT OFFSET VOLTAGE: ±200µV
q LOW INPUT OFFSET DRIFT: ±2µV/°C
q LOW INPUT NOISE:
20nV/√Hz at f = 1kHz (G =100)
q HIGH CMR: 106dB
q WIDE SUPPLY RANGE: ±2.25V to ±18V
q LOW NONLINEARITY ERROR: 0.001% max
q INPUT PROTECTION TO ±40V
q 8-PIN DIP AND SO-8 SURFACE MOUNT
APPLICATIONS
q LOW-LEVEL TRANSDUCER AMPLIFIERS
Bridge, RTD, Thermocouple
q PHYSIOLOGICAL AMPLIFIERS
ECG, EEG, EMG, Respiratory
q HIGH IMPEDANCE TRANSDUCERS
q CAPACITIVE SENSORS
q MULTI-CHANNEL DATA ACQUISITION
q PORTABLE, BATTERY OPERATED SYSTEMS
q GENERAL PURPOSE INSTRUMENTATION
The INA121 is a FET-input, low power instrumenta-
tion amplifier offering excellent accuracy. Its versatile
three-op amp design and very small size make it ideal
for a variety of general purpose applications. Low bias
current (±4pA) allows use with high impedance
sources.
Gain can be set from 1V to 10,000V/V with a single
external resistor. Internal input protection can with-
stand up to ±40V without damage.
The INA121 is laser-trimmed for very low offset
voltage (±200µV), low offset drift (±2µV/°C), and
high common-mode rejection (106dB at G = 100). It
operates on power supplies as low as ±2.25V (+4.5V),
allowing use in battery operated and single 5V sys-
tems. Quiescent current is only 450µA.
Package options include 8-pin plastic DIP and SO-8
surface mount. All are specified for the –40°C to
+85°C industrial temperature range.
V+
7
VI–N
2 Over-Voltage
Protection
1
RG
8
A1
25kΩ
40kΩ
25kΩ
INA121
40kΩ
G = 1 + 50kΩ
RG
6
A3 VO
+ 3 Over-Voltage
VIN Protection
A2
40kΩ
40kΩ
5
Ref
4
V–
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/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132
©1997 Burr-Brown Corporation
PDS-11412A
IPNrinAted1in2U1.S.A. May, 1998
®
1 page TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, unless otherwise noted.
INPUT BIAS CURRENT vs TEMPERATURE
10k
1k
100
10
IB
1
IOS
0.1
0.01
–75 –50 –25
0
25 50
Temperature (°C)
75 100 125
INPUT BIAS CURRENT
vs COMMON-MODE INPUT VOLTAGE
1m
100µ
10µ
10p
1p
–10µ
–100µ
–1m
–20 –15 –10 –5 0
5 10
Common-Mode Voltage (V)
15 20
INPUT OVER-VOLTAGE V/I CHARACTERISTICS
1
0.8
0.6 Flat region represents
0.4 normal linear operation.
G = 1V/V
G = 1000V/V
0.2
0
–0.2 +15V
–0.4
–0.6
–0.8
G = 1V/V
G = 1000V/V
VIN
IIN –15V
–1
–50 –40 –30 –20 –10 0 10 20 30 40 50
Input Voltage (V)
1000
100
10
1
SETTLING TIME vs GAIN
0.01%
0.1%
10 100
Gain (V/V)
1000
QUIESCENT CURRENT AND SLEW RATE
vs TEMPERATURE
500 1.4
475 1.2
IQ
450 1
425 0.8
SR
400 0.6
375
–75 –50 –25
0 25 50
Temperature (°C)
0.4
75 100 125
SHORT-CIRCUIT CURRENT
vs TEMPERATURE
±15
+ISC
±14
±13
–ISC
±12
±11
±10
–75 –50 –25
0 25 50
Temperature (°C)
75 100 125
®
5 INA121
5 Page C1
C2
R1
RG INA121
VO
Ref
R2
fc =
1
2πR1C1
NOTE: To preserve good low frequency CMR,
make R1 = R2 and C1 = C2.
FIGURE 7. High-Pass Input Filter.
±6V to ±18V
Isolated Power
V+ V–
±15V
VI–N
INA121
VI+N Ref
ISO124
VO
Isolated
Common
FIGURE 8. Galvanically Isolated Instrumentation
Amplifier.
–
VIN RG INA121
+
Ref
C1
0.1µF
VO
R1
1MΩ
OPA277
f–3dB =
1
2πR1C1
= 1.59Hz
VIN
OPA277
C1
50nF
R1
10kΩ
INA121
Ref
RG R2
Make
G ≤ 10
where
G
=1
+
50k
RG
Load
IL
=
VIN
G • R2
FIGURE 9. AC-Coupled Instrumentation Amplifier.
FIGURE 10. Voltage Controlled Current Source.
VAC
R1 R2
C1
C2
Null
RG
INA121
VO
Transducer
Ref
FIGURE 11. Capacitive Bridge Transducer Circuit.
®
11 INA121
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet INA121P.PDF ] |
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