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PDF AD8228 Data sheet ( Hoja de datos )
| Número de pieza | AD8228 | |
| Descripción | Low Gain Drift Precision Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
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Low Gain Drift
Precision Instrumentation Amplifier
AD8228
FEATURES
Easy to use
Pin strappable gains of 10 and 100
Wide power supply range: ±2.3 V to ±18 V
DC specifications (B Grade, G = 10)
2 ppm/°C gain drift
0.02% gain error
50 μV maximum input offset voltage
0.8 μV/°C maximum input offset drift
0.6 nA maximum input bias current
100 dB CMRR
AC specifications
650 kHz, –3 dB bandwidth (G = 10)
2 V/μs slew rate
Low noise
8 nV/√Hz, @ 1 kHz (G = 100)
0.3 μV p-p from 0.1 Hz to 10 Hz (G = 100)
APPLICATIONS
Weigh scales
Industrial process controls
Bridge amplifiers
Precision data acquisition systems
Medical instrumentation
Strain gages
Transducer interfaces
GENERAL DESCRIPTION
The AD8228 is a high performance instrumentation amplifier
with very high gain accuracy. Because all gain setting resistors
are internal and laser trimmed, gain accuracy and gain drift
are better than can be achieved with typical instrumentation
amplifiers.
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.
CONNECTION DIAGRAM
–IN 1
G1 2
G2 3
8 +VS
7 VOUT
6 REF
+IN 4 AD8228 5 –VS
TOP VIEW
(Not to Scale)
Figure 1.
Table 1. Instrumentation Amplifiers by Category
General Zero
Purpose Drift
Military Low
Grade Power
High Speed
PGA
AD82201 AD82311 AD620 AD6271 AD8250
AD8221 AD85531 AD621 AD6231 AD8251
AD8222 AD85551 AD524
AD8253
AD82241 AD85561 AD526
AD8228 AD85571 AD624
1 Rail-to-rail output.
The AD8228 operates on both single and dual supplies. Because
the part can operate on supplies up to ±18 V, it is well suited for
applications where high common-mode input voltages are
encountered. The AD8228 is available in 8-lead MSOP and
SOIC packages.
Performance is specified over the entire industrial temperature
range of −40°C to +85°C for all grades. Furthermore, the AD8228
is operational from −40°C to +125°C. For a pin-compatible ampli-
fier with similar specifications, but with a gain range of 1 to 1000,
see the AD8221.
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.
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
©2008 Analog Devices, Inc. All rights reserved.
1 page  
www.DataSheet4U.com
AD8228
GAIN = 100
VS = ±15 V, VREF = 0 V, TA = 25°C, RL = 2 kΩ, all specifications referred to input, unless otherwise noted.
Table 3.
Parameter
COMMON-MODE REJECTION RATIO
CMRR DC to 60 Hz with 1 kΩ
Source Imbalance
CMRR at 2 kHz
NOISE
Voltage Noise
Current Noise
VOLTAGE OFFSET
Offset
Over Temperature
Average TC
Offset vs. Supply (PSR)
INPUT CURRENT
Input Bias Current
Over Temperature
Average TC
Input Offset Current
Over Temperature
Average TC
REFERENCE INPUT
RIN
IIN
Voltage Range
Gain to Output
DYNAMIC RESPONSE
Small Signal −3 dB Bandwidth
Settling Time 0.01%
Settling Time 0.001%
Slew Rate
GAIN
Gain Error
Gain Nonlinearity
RL = 10 kΩ
RL = 2 kΩ
Gain vs. Temperature
INPUT
Input Impedance
Differential
Common Mode
Input Operating Voltage Range1
Over Temperature
Input Operating Voltage Range1
Over Temperature
Conditions
(Gain = 100)
Min
VCM = −10 V to +10 V 114
VCM = −10 V to +10 V
VIN+ = VIN− = VREF = 0 V
f = 1 kHz
f = 0.1 Hz to 10 Hz
f = 1 kHz
f = 0.1 Hz to 10 Hz
Referred to input,
VS = ±5 V to ±15 V
100
T = −40°C to +85°C
T = −40°C to +85°C
118
T = −40°C to +85°C
T = −40°C to +85°C
T = −40°C to +85°C
T = −40°C to +85°C
VIN+ = VIN− = VREF = 0 V
−VS
10 V step
10 V step
VOUT = −10 V to +10 V
2
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
A Grade
Typ Max
8
0.3
40
6
Min
120
105
90
140
0.9
140
0.5 1.5
2.0
1
0.2 0.6
0.8
1
20
50
1 ± 0.0001
60
+VS
110
13
15
2.5
0.1
5 15
15 45
1 10
124
−VS
2
B Grade
Typ
0.3
40
6
140
0.4
1
0.1
1
20
50
1 ± 0.0001
110
13
15
2.5
5
15
1
100||2
100||2
+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
Max
8
50
80
0.5
0.6
1
0.4
0.6
60
+VS
0.05
15
45
2
+VS − 1.1
+VS − 1.2
+VS − 1.2
+VS − 1.2
Unit
dB
dB
nV/√Hz
μV p-p
fA/√Hz
pA p-p
μV
μV
μV/°C
dB
nA
nA
pA/°C
nA
nA
pA/°C
kΩ
μA
V
V/V
kHz
μs
μs
V/μs
%
ppm
ppm
ppm/°C
GΩ||pF
GΩ||pF
V
V
V
V
Rev. 0 | Page 5 of 24
5 Page 
www.DataSheet4U.com
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
0.01
0.1 1
WARM-UP TIME (Minutes)
10
Figure 15. Change in Input Offset Voltage vs. Warm-Up Time
4
3
2
+IN IBIAS
1
0
–1 –IN IBIAS
–2
IOS
–3
–4
–40 –20
0
20 40 60 80
TEMPERATURE (°C)
100 120 140
Figure 16. Input Bias Current and Offset Current vs. Temperature
160
140
G = 100
120
G = 10
100
80
60
40
20
10
100 1k 10k 100k
FREQUENCY (Hz)
Figure 17. Positive PSRR vs. Frequency, RTI
1M
AD8228
160
140
120
100
80
60
40
20
0.1
G = 100
G = 10
1 10 100 1k 10k 100k
FREQUENCY (Hz)
Figure 18. Negative PSRR vs. Frequency
1M
70
60
50
40
30
20
10
0
–10
–20
–30
100
G = 100
G = 10
1k 10k 100k 1M
FREQUENCY (Hz)
Figure 19. Gain vs. Frequency
10M
150
100
G = 10
50
0
G = 100
–50
–100
–150
–45 –30 –15 0
15 30 45 60 75 90 105 120 135
TEMPERATURE (°C)
Figure 20. Gain Error vs. Temperature
Rev. 0 | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD8228.PDF ] | |
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