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PDF AD8422 Data sheet ( Hoja de datos )
| Número de pieza | AD8422 | |
| Descripción | Precision Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
High Performance, Low Power, Rail-to-Rail
Precision Instrumentation Amplifier
AD8422
FEATURES
Low power: 330 µA maximum quiescent current
Rail-to-rail output
Low noise and distortion
8 nV/√Hz maximum input voltage noise at 1 kHz
0.15 µV p-p RTI noise (G = 100)
0.5 ppm nonlinearity with 2 kΩ load (G = 1)
Excellent ac specifications
80 dB minimum CMRR at 10 kHz (G = 1)
2.2 MHz bandwidth (G = 1)
High precision dc performance (AD8422BRZ)
150 dB minimum CMRR (G = 1000)
0.04% maximum gain error (G = 1000)
0.3 µV/°C maximum input offset drift
0.5 nA maximum input bias current
Wide supply range
4.6 V to 36 V single supply
±2.3 V to ±18 V dual supply
Input overvoltage protection: 40 V from opposite supply
Gain range: 1 to 1000
APPLICATIONS
Medical instrumentation
Industrial process controls
Strain gages
Transducer interfaces
Precision data acquisition systems
Channel-isolated systems
Portable instrumentation
GENERAL DESCRIPTION
The AD8422 is a high precision, low power, low noise, rail-to-rail
instrumentation amplifier that delivers the best performance
per unit microampere in the industry. The AD8422 processes
signals with ultralow distortion performance that is load
independent over its full output range.
The AD8422 is the third generation development of the industry-
standard AD620. The AD8422 employs new process technologies
and design techniques to achieve higher dynamic range and
lower errors than its predecessors, while consuming less than
one-third of the power. The AD8422 uses the high performance
pinout introduced by the AD8221.
Very low bias current makes the AD8422 error-free with high
source impedance, allowing multiple sensors to be multiplexed
to the inputs. Low voltage noise and low current noise make the
AD8422 an ideal choice for measuring a Wheatstone bridge.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
CONNECTION DIAGRAM
–IN 1
RG 2
RG 3
+IN 4
AD8422
8 +VS
7 VOUT
6 REF
5 –VS
TOP VIEW
(Not to Scale)
Figure 1. 8-Lead MSOP (RM), 8-Lead SOIC (R)
–20
–30
RL = 2kΩ
VOUT = ±10V
–40
–50
–60
–70
–80 G = 1000
–90
–100
–110
–120
G = 100
G = 10
G=1
–130
–140
10
100
FREQUENCY (Hz)
1k
Figure 2. Total Harmonic Distortion vs. Frequency
5k
The wide input range and rail-to-rail output of the AD8422
bring all of the benefits of a high performance in-amp to single-
supply applications. Whether using high or low supply voltages,
the power savings make the AD8422 an excellent choice for
high channel count or power sensitive applications on a very
tight error budget.
The AD8422 uses robust input protection that ensures reliability
without sacrificing noise performance. The AD8422 has high
ESD immunity, and the inputs are protected from continuous
voltages up to 40 V from the opposite supply rail.
A single resistor sets the gain from 1 to 1000. The reference pin
can be used to apply a precise offset to the output voltage.
The AD8422 is specified from −40°C to +85°C and has typical
performance curves to 125°C. It is available in 8-lead MSOP
and 8-lead SOIC packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2013–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
AD8422
Data Sheet
Parameter
REFERENCE INPUT
RIN
IIN
Voltage Range
Gain to Output
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
G=1
G = 10
G = 100
G = 1000
Settling Time 0.01%
G=1
G = 10
G = 100
G = 1000
Settling Time 0.001%
G=1
G = 10
G = 100
G = 1000
Slew Rate
GAIN3
Gain Range
Gain Error
G=1
G = 10
G = 100
G = 1000
Gain Nonlinearity
G=1
G = 10
G = 100
G = 1000
Gain vs. Temperature
G=1
G>1
INPUT
Input Impedance
Differential
Common Mode
Input Operating Voltage Range4
Over Temperature
OUTPUT
Output Swing, RL = 10 kΩ
Over Temperature
Output Swing, RL = 10 kΩ
Over Temperature
Output Swing, RL = 2 kΩ
Over Temperature5
Output Swing, RL = 2 kΩ
Over Temperature
Short-Circuit Current
Test Conditions/
Comments
VIN+, VIN−, VREF = 0 V
10 V step
10 V step
G = 1 to 100
G = 1 + (19.8 kΩ/RG)
VOUT ± 10 V
VOUT = −10 V to +10 V
RL = 2 kΩ
VS = ±2.3 V to ±18 V
T = −40°C to +85°C
VS = ±15 V
T = −40°C to +85°C
VS = ±2.3 V
T = −40°C to +85°C
VS = ±15 V
T = −40°C to +85°C
VS = ±2.3 V
T = −40°C to +85°C
AD8422ARZ
Min Typ
Max
20
35
–VS
1
50
+VS
AD8422BRZ
Min Typ
Max
20
35
–VS
1
50
+VS
Unit
kΩ
µA
V
V/V
2200
850
120
12
2200
850
120
12
kHz
kHz
kHz
kHz
13 13 µs
13 13 µs
12 12 µs
80 80 µs
15
15
15
160
0.8
15
15
15
160
0.8
µs
µs
µs
µs
V/µs
1
1000
1
1000
V/V
0.03 0.01 %
0.2 0.04 %
0.2 0.04 %
0.2 0.04 %
0.5 5
25
4 10
10 20
0.5 5
ppm
2 5 ppm
4 10 ppm
10 20 ppm
5 1 ppm/°C
−80 –80 ppm/°C
−VS + 1.2
−VS + 1.2
200||2
200||2
−VS + 0.2
−VS + 0.25
−VS + 0.12
−VS + 0.13
−VS + 0.25
−VS + 0.3
−VS + 0.16
−VS + 0.2
20
+VS − 1.2
+VS − 1.3
–VS + 1.2
–VS + 1.2
200||2
200||2
+VS − 0.2
+VS − 0.25
+VS − 0.12
+VS − 0.13
+VS − 0.25
+VS – 1.4
+VS − 0.16
+VS − 0.2
−VS + 0.2
−VS + 0.25
−VS + 0.12
−VS + 0.13
−VS + 0.25
−VS + 0.3
−VS + 0.16
−VS + 0.2
20
+VS − 1.2
+VS − 1.3
GΩ||pF
GΩ||pF
V
V
+VS − 0.2
+VS − 0.25
+VS − 0.12
+VS − 0.13
+VS − 0.25
+VS – 1.4
+VS − 0.16
+VS − 0.2
V
V
V
V
V
V
V
V
mA
Rev. A | Page 4 of 24
5 Page 
AD8422
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, VS = ±15, VREF = 0 V, RL = 10 kΩ, unless otherwise noted.
400
350
300
250
200
150
100
50
0
–90
–60 –30 0 30
INPUT OFFSET VOLTAGE (µV)
60
90
Figure 4. Typical Distribution of Input Offset Voltage
800
600
400
200
0
–900
–600
–300
0
300 600
POSITIVE INPUT BIAS CURRENT (pA)
Figure 5. Typical Distribution of Input Bias Current
900
500
400
300
200
100
0
–9 –6 –3 0 3
PSRR G = 1 (µV/V)
6
Figure 6. Typical Distribution of PSRR (G = 1)
9
Data Sheet
400
350
300
250
200
150
100
50
0
–300
–200
–100
0
100
OUTPUT OFFSET VOLTAGE (µV)
200
300
Figure 7. Typical Distribution of Output Offset Voltage
400
300
200
100
0
–300
–200
–100
0
100
INPUT OFFSET CURRENT (pA)
200
Figure 8. Typical Distribution of Input Offset Current
300
500
400
300
200
100
0
–40 –20 0 20
CMRR G = 1 (µV/V)
Figure 9. Typical Distribution of CMRR (G = 1)
40
Rev. A | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD8422.PDF ] | |
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