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PDF AD8221 Data sheet ( Hoja de datos )
| Número de pieza | AD8221 | |
| Descripción | Precision Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AD8221 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
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Precision Instrumentation Amplifier
AD8221
FEATURES
Easy to use
Available in space-saving MSOP
Gain set with 1 external resistor (gain range 1 to 1000)
Wide power supply range: ±2.3 V to ±18 V
Temperature range for specified performance:
−40°C to +85°C
Operational up to 125°C1
Excellent AC specifications
80 dB minimum CMRR to 10 kHz (G = 1)
825 kHz, –3 dB bandwidth (G = 1)
2 V/µs slew rate
Low noise
8 nV/√Hz, @ 1 kHz, maximum input voltage noise
0.25 µV p-p input noise (0.1 Hz to 10 Hz)
High accuracy dc performance (AD8221BR)
90 dB minimum CMRR (G = 1)
25 µV maximum input offset voltage
0.3 µV/°C maximum input offset drift
0.4 nA maximum input bias current
APPLICATIONS
Weigh scales
Industrial process controls
Bridge amplifiers
Precision data acquisition systems
Medical instrumentation
Strain gages
Transducer interfaces
GENERAL DESCRIPTION
The AD8221 is a gain programmable, high performance
instrumentation amplifier that delivers the industry’s highest
CMRR over frequency in its class. The CMRR of instrumentation
amplifiers on the market today falls off at 200 Hz. In contrast,
the AD8221 maintains a minimum CMRR of 80 dB to 10 kHz
for all grades at G = 1. High CMRR over frequency allows the
AD8221 to reject wideband interference and line harmonics,
greatly simplifying filter requirements. Possible applications
include precision data acquisition, biomedical analysis, and
aerospace instrumentation.
CONNECTION DIAGRAM
120
110
100
90
80
70
60
50
40
10
–IN 1
RG 2
RG 3
+IN 4
8 +VS
7 VOUT
6 REF
AD8221 5 –VS
TOP VIEW
Figure 1.
AD8221
COMPETITOR 1
COMPETITOR 2
100 1k 10k
FREQUENCY (Hz)
Figure 2. Typical CMRR vs. Frequency for G = 1
100k
Low voltage offset, low offset drift, low gain drift, high gain
accuracy, and high CMRR make this part an excellent choice
in applications that demand the best dc performance possible,
such as bridge signal conditioning.
Programmable gain affords the user design flexibility. A single
resistor sets the gain from 1 to 1000. The AD8221 operates on
both single and dual supplies and is well suited for applications
where ±10 V input voltages are encountered.
The AD8221 is available in a low cost 8-lead SOIC and 8-lead
MSOP, both of which offer the industry’s best performance. The
MSOP requires half the board space of the SOIC, making it ideal
for multichannel or space-constrained applications.
Performance is specified over the entire industrial temperature
range of −40°C to +85°C for all grades. Furthermore, the AD8221
is operational from −40°C to +125°C1.
1 See Typical Performance Characteristics for expected operation from
85°C to 125°C.
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
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 ©2003–2011 Analog Devices, Inc. All rights reserved.
1 page  
AD8221
Parameter
POWER SUPPLY
Operating Range
Quiescent Current
Over Temperature
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
G=1
G = 10
G = 100
G = 1000
Settling Time 0.01%
G = 1 to 100
G = 1000
Settling Time 0.001%
G = 1 to 100
G = 1000
Slew Rate
GAIN
Gain Range
Gain Error
G=1
G = 10
G = 100
G = 1000
Gain Nonlinearity
G = 1 to 10
G = 100
G = 1000
G = 1 to 100
Gain vs. Temperature
G=1
G > 12
INPUT
Input Impedance
Differential
Common Mode
Input Operating Voltage Range3
Over Temperature
Input Operating Voltage Range
Over Temperature
OUTPUT
Output Swing
Over Temperature
Output Swing
Over Temperature
Short-Circuit Current
Conditions
Min
VS = ±2.3 V to ±18 V
T = −40°C to +85°C
±2.3
AR Grade
Typ Max
±18
0.9 1
1 1.2
BR Grade
Min Typ Max
±2.3 ±18
0.9 1
1 1.2
Unit
V
mA
mA
10 V step
10 V step
G=1
G = 5 to 100
G = 1 + (49.4 kΩ/RG)
VOUT ± 10 V
1.5
2
1
VOUT = −10 V to +10 V
RL = 10 kΩ
RL = 10 kΩ
RL = 10 kΩ
RL = 2 kΩ
825
562
100
14.7
10
80
13
110
2
2.5
1000
0.03
0.3
0.3
0.3
3 10
5 15
10 40
10 95
3 10
–50
825
562
100
14.7
10
80
13
110
1.5 2
2 2.5
1 1000
0.02
0.15
0.15
0.15
3 10
5 15
10 40
10 95
25
–50
kHz
kHz
kHz
kHz
µs
µs
µs
µs
V/µs
V/µs
V/V
%
%
%
%
ppm
ppm
ppm
ppm
ppm/°C
ppm/°C
VS = ±2.3 V to ±5 V
T = −40°C to +85°C
VS = ±5 V to ±18 V
T =−40°C to +85°C
RL = 10 kΩ
VS = ±2.3 V to ±5 V
T = −40°C to +85°C
VS = ±5 V to ±18 V
T = –40°C to +85°C
–VS + 1.9
–VS + 2.0
–VS + 1.9
–VS + 2.0
100||2
100||2
–VS + 1.1
–VS + 1.4
–VS + 1.2
–VS + 1.6
18
+VS − 1.1
+VS − 1.2
+VS − 1.2
+VS − 1.2
–VS + 1.9
–VS + 2.0
–VS + 1.9
–VS + 2.0
100||2
100||2
+VS − 1.2
+Vs − 1.3
+VS − 1.4
+VS − 1.5
–VS + 1.1
–VS + 1.4
–VS + 1.2
–VS + 1.6
18
+VS − 1.1
+VS − 1.2
+VS − 1.2
+VS − 1.2
GΩ||pF
GΩ||pF
V
V
V
V
+VS − 1.2
+VS − 1.3
+VS − 1.4
+VS − 1.5
V
V
V
V
mA
Rev. C | Page 4 of 24
5 Page 
AD8221
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, VS = ±15 V, RL = 10 kΩ, unless otherwise noted.
1600
1400
1200
1000
800
600
400
200
0
–150
–100
–50
0
50 100
CMR (µV/V)
Figure 4. Typical Distribution for CMR (G = 1)
150
2400
2100
1800
1500
1200
900
600
300
0
–60 –40 –20
0
20 40
INPUT OFFSET VOLTAGE (µV)
Figure 5. Typical Distribution of Input Offset Voltage
60
3000
2500
2000
1500
1000
500
0
–1.5 –1.0 –0.5
0
0.5 1.0 1.5
INPUT BIAS CURRENT (nA)
Figure 6. Typical Distribution of Input Bias Current
3500
3000
2500
2000
1500
1000
500
0
–0.9 –0.6 –0.3 0 0.3 0.6
INPUT OFFSET CURRENT (nA)
Figure 7. Typical Distribution of Input Offset Current
0.9
15
10
VS = ±15V
5
0
VS = ±5V
–5
–10
–15
–15
–10
–5
0
5 10 15
OUTPUT VOLTAGE (V)
Figure 8. Input Common-Mode Range vs. Output Voltage, G = 1
15
10
VS = ±15V
5
0
VS = ±5V
–5
–10
–15
–15
–10
–5
0
5 10 15
OUTPUT VOLTAGE (V)
Figure 9. Input Common-Mode Range vs. Output Voltage, G = 100
Rev. C | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD8221.PDF ] | |
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