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PDF AD8421 Data sheet ( Hoja de datos )
| Número de pieza | AD8421 | |
| Descripción | Low Power Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
FEATURES
Low power
2.3 mA maximum supply current
Low noise
3.2 nV/√Hz maximum input voltage noise at 1 kHz
200 fA/√Hz current noise at 1 kHz
Excellent ac specifications
10 MHz bandwidth (G = 1)
2 MHz bandwidth (G = 100)
0.6 μs settling time to 0.001% (G = 10)
80 dB CMRR at 20 kHz (G = 1)
35 V/μs slew rate
High precision dc performance (AD8421BRZ)
94 dB CMRR minimum (G = 1)
0.2 μV/°C maximum input offset voltage drift
1 ppm/°C maximum gain drift (G = 1)
500 pA maximum input bias current
Inputs protected to 40 V from opposite supply
±2.5 V to ±18 V dual supply (5 V to 36 V single supply)
Gain set with a single resistor (G = 1 to 10,000)
APPLICATIONS
Medical instrumentation
Precision data acquisition
Microphone preamplification
Vibration analysis
Multiplexed input applications
ADC driver
GENERAL DESCRIPTION
The AD8421 is a low cost, low power, extremely low noise, ultralow
bias current, high speed instrumentation amplifier that is ideally
suited for a broad spectrum of signal conditioning and data
acquisition applications. This product features extremely high
CMRR, allowing it to extract low level signals in the presence of
high frequency common-mode noise over a wide temperature
range.
The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling
time to 0.001% (G = 10) allow the AD8421 to amplify high speed
signals and excel in applications that require high channel count,
multiplexed systems. Even at higher gains, the current feedback
architecture maintains high performance; for example, at G = 100,
the bandwidth is 2 MHz and the settling time is 0.8 μs. The
AD8421 has excellent distortion performance, making it suitable
for use in demanding applications such as vibration analysis.
Rev. 0
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.
3 nV/√Hz, Low Power
Instrumentation Amplifier
AD8421
PIN CONNECTION DIAGRAM
–IN 1
RG 2
RG 3
+IN 4
AD8421
8 +VS
7 VOUT
6 REF
5 –VS
TOP VIEW
(Not to Scale)
Figure 1.
10µ
G = 100
1µ
BEST AVAILABLE
7mA LOW NOISE IN-AMP
100n
BEST AVAILABLE
1mA LOW POWER IN-AMP
10n
AD8421
1n
100
RS NOISE ONLY
1k 10k 100k
SOURCE RESISTANCE, RS (Ω)
Figure 2. Noise Density vs. Source Resistance
1M
The AD8421 delivers 3 nV/√Hz input voltage noise and
200 fA/√Hz current noise with only 2 mA quiescent current,
making it an ideal choice for measuring low level signals. For
applications with high source impedance, the AD8421 employs
innovative process technology and design techniques to provide
noise performance that is limited only by the sensor.
The AD8421 uses unique protection methods to ensure robust
inputs while still maintaining very low noise. This protection
allows input voltages up to 40 V from the opposite supply rail
without damage to the part.
A single resistor sets the gain from 1 to 10,000. The reference
pin can be used to apply a precise offset to the output voltage.
The AD8421 is specified from −40°C to +85°C and has typical
performance curves to 125°C. It is available in 8-lead MSOP
and SOIC packages.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2012 Analog Devices, Inc. All rights reserved.
1 page  
AD8421
Data Sheet
Parameter
DYNAMIC RESPONSE
Small Signal Bandwidth
G=1
G = 10
G = 100
G = 1000
Settling Time to 0.01%
G=1
G = 10
G = 100
G = 1000
Settling Time to 0.001%
G=1
G = 10
G = 100
G = 1000
Slew Rate
G = 1 to 100
GAIN3
Gain Range
Gain Error
G=1
G = 10 to 1000
Gain Nonlinearity
G=1
G = 10 to 1000
Gain vs. Temperature3
G=1
G>1
INPUT
Input Impedance
Differential
Common Mode
Input Operating Voltage Range4
Over Temperature
OUTPUT
Output Swing
Over Temperature
Short-Circuit Current
REFERENCE INPUT
RIN
IIN
Voltage Range
Reference Gain to Output
Test Conditions/
Comments
−3 dB
10 V step
10 V step
G = 1 + (9.9 kΩ/RG)
VOUT = ±10 V
VOUT = −10 V to +10 V
RL ≥ 2 kΩ
RL = 600 Ω
RL ≥ 600 Ω
VOUT = −5 V to +5 V
VS = ±2.5 V to ±18 V
TA = −40°C
TA = +85°C
RL = 2 kΩ
VS = ±2.5 V to ±18 V
TA = −40°C to +85°C
VIN+, VIN− = 0 V
AR Grade
Min Typ Max
10
10
2
0.2
0.7
0.4
0.6
5
1
0.6
0.8
6
35
1 10,000
0.02
0.2
1
13
30 50
5 10
5
−50
−VS + 2.3
−VS + 2.5
−VS + 2.1
30||3
30||3
+VS − 1.8
+VS − 2.0
+VS − 1.8
−VS + 1.2
−VS + 1.2
65
+Vs − 1.6
+Vs − 1.6
20
20 24
−VS +VS
1±
0.0001
BR Grade
Min Typ Max
10
10
2
0.2
0.7
0.4
0.6
5
1
0.6
0.8
6
35
1 10,000
0.01
0.1
1
13
30 50
5 10
0.1 1
−50
−VS + 2.3
−VS + 2.5
−VS + 2.1
30||3
30||3
+VS − 1.8
+VS − 2.0
+VS − 1.8
−VS + 1.2
−VS + 1.2
65
+VS − 1.6
+VS − 1.6
20
20 24
−VS +VS
1±
0.0001
Unit
MHz
MHz
MHz
MHz
μs
μs
μs
μs
μs
μs
μs
μs
V/μs
V/V
%
%
ppm
ppm
ppm
ppm
ppm/°C
ppm/°C
GΩ||pF
GΩ||pF
V
V
V
V
V
mA
kΩ
μA
V
V/V
Rev. 0 | Page 4 of 28
5 Page 
AD8421
TYPICAL PERFORMANCE CHARACTERISTICS
TA = 25°C, VS = ±15 V, VREF = 0 V, RL = 2 kΩ, unless otherwise noted.
600
500
400
300
200
100
0
–60 –40 –20
0
20 40
INPUT OFFSET VOLTAGE (µV)
Figure 4. Typical Distribution of Input Offset Voltage
60
1800
1500
1200
900
600
300
0
–2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0
INPUT BIAS CURRENT (nA)
Figure 5. Typical Distribution of Input Bias Current
1400
1200
1000
800
600
400
200
0
–20 –15 –10
–5
0
5 10 15 20
PSRR (µV/V)
Figure 6. Typical Distribution of PSRR (G = 1)
Data Sheet
600
500
400
300
200
100
0
–400 –300 –200 –100
0
100 200 300 400
OUTPUT OFFSET VOLTAGE (µV)
Figure 7. Typical Distribution of Output Offset Voltage
1200
1000
800
600
400
200
0
–2.0 –1.5 –1.0 –0.5
0
0.5 1.0 1.5 2.0
INPUT OFFSET CURRENT (nA)
Figure 8. Typical Distribution of Input Offset Current
1600
1400
1200
1000
800
600
400
200
0
–120 –90 –60 –30 0 30 60 90
CMRR (µV/V)
Figure 9. Typical Distribution of CMRR (G = 1)
120
Rev. 0 | Page 10 of 28
11 Page | ||
| Páginas | Total 29 Páginas | |
| PDF Descargar | [ Datasheet AD8421.PDF ] | |
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