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PDF AD8229 Data sheet ( Hoja de datos )
| Número de pieza | AD8229 | |
| Descripción | Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
1 nV/√Hz Low Noise
210°C Instrumentation Amplifier
AD8229
FEATURES
Designed and guaranteed for 210°C operation
Low noise
1 nV/√Hz input noise
45 nV/√Hz output noise
High CMRR
126 dB CMRR (minimum), G = 100
80 dB CMRR (minimum) to 5 kHz, G = 1
Excellent ac specifications
15 MHz bandwidth (G = 1)
1.2 MHz bandwidth (G = 100)
22 V/μs slew rate
THD: −130 dBc (1 kHz, G = 1)
Versatile
±4 V to ±17 V dual supply
Gain set with single resistor (G = 1 to 1000)
Specified temperature range
−40°C to +210°C, SBDIP package
−40°C to +175°C, SOIC package
APPLICATIONS
Down-hole instrumentation
Harsh environment data acquisition
Exhaust gas measurements
Vibration analysis
GENERAL DESCRIPTION
The AD8229 is an ultralow noise instrumentation amplifier
designed for measuring small signals in the presence of large
common-mode voltages and high temperatures.
The AD8229 has been designed for high temperature operation.
The process is dielectrically isolated to avoid leakage currents at
high temperatures. The design architecture was chosen to
compensate for the low VBE voltages at high temperatures.
The AD8229 excels at measuring tiny signals. It delivers industry
leading 1 nV/√Hz input noise performance. The high CMRR of
the AD8229 prevents unwanted signals from corrupting the
acquisition. The CMRR increases as the gain increases, offering
high rejection when it is most needed.
The AD8229 is one of the fastest instrumentation amplifiers
available. Its current feedback architecture provides high
FUNCTIONAL BLOCK DIAGRAM
–IN 1
RG 2
RG 3
+IN 4
AD8229
8 +VS
7 VOUT
6 REF
5 –VS
TOP VIEW
(Not to Scale)
Figure 1.
100
80
60
40
20
0
–20
–40
–60
–80
–100
–55 –35 –15 5 25 45 65 85 105 125 145 165 185 205 225
TEMPERATURE (°C)
Figure 2. Typical Input Offset vs. Temperature (G = 100)
bandwidth at high gain, for example, 1.2 MHz at G = 100. The
design includes circuitry to improve settling time after large
input voltage transients. The AD8229 was designed for excellent
distortion performance, allowing use in demanding applications
such as vibration analysis.
Gain is set from 1 to 1000 with a single resistor. A reference pin
allows the user to offset the output voltage. This feature can be
useful when interfacing with analog-to-digital converters.
For the most demanding applications, the AD8229 is available
in an 8-lead side-brazed ceramic dual in-line package (SBDIP).
For space-constrained applications, the AD8229 is available in
an 8-lead plastic standard small outline package (SOIC).
Rev. B
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.
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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 ©2011–2012 Analog Devices, Inc. All rights reserved.
1 page  
Data Sheet
AD8229
Parameter
REFERENCE INPUT
RIN
IIN
Voltage Range
Reference Gain to Output
Reference Gain Error
POWER SUPPLY
Operating Range
Quiescent Current
High Temperature, SBDIP package
High Temperature, SOIC package
TEMPERATURE RANGE
For Specified Performance5
SBDIP package
SOIC package
Test Conditions/Comments
VIN+, VIN− = 0 V
TA = 210°C
TA = 175°C
Min Typ Max Unit
10 kΩ
70 µA
−VS +VS V
1 V/V
0.01 %
±4 ±17 V
6.7 7
mA
12 mA
11 mA
−40
+210
°C
−40
+175
°C
1 Total Voltage Noise = √(eni2 + (eno/G)2)+ eRG2). See the Theory of Operation section for more information.
2 These specifications do not include the tolerance of the external gain setting resistor, RG. For G>1, RG errors should be added to the specifications given in this table.
3 Differential and common-mode input impedance can be calculated from the pin impedance: ZDIFF = 2(ZPIN); ZCM = ZPIN/2.
4 Input voltage range of the AD8229 input stage only. The input range can depend on the common-mode voltage, differential voltage, gain, and reference voltage. See
the Input Voltage Range section for more details.
5 For the guaranteed operation time at the maximum specified temperature, refer to the Predicted Lifetime vs. Operating Temperature section.
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Rev. B | Page 5 of 24
5 Page 
Data Sheet
12
10
8
6
4
2
0
0 100 200 300 400 500 600 700
WARM-UP TIME (s)
Figure 23. Change in Input Offset Voltage (VOSI) vs. Warm-Up Time
200 10.0
150 7.5
INPUT OFFSET
100
CURRENT
5.0
50 2.5
INPUT BIAS
0
CURRENT
0
–50 –2.5
–100
–5.0
–150
–7.5
–200
–55 –25 5
–10.0
35 65 95 125 155 185 215
TEMPERATURE (°C)
Figure 24. Input Bias Current and Input Offset Current vs. Temperature
150
100
50
0
–50
–100
–150
–200
–250
–55 –25 5
35 65 95 125 155 185 215
TEMPERATURE (°C)
Figure 25. Gain Error vs. Temperature, G = 1, Normalized at 25°C
AD8229
20
15
10
5
0
–5
–10
–55 –25 5 35 65 95 125 155 185 215
TEMPERATURE (°C)
Figure 26. CMRR vs. Temperature, G = 1, Normalized at 25°C
12
10
8
6
4
2
0
–55 –25 5
35 65 95 125 155 185 215
TEMPERATURE (°C)
Figure 27. Supply Current vs. Temperature, G = 1
50
40 ISHORT+
30
20
10
0
–10
–20
–30
–40 ISHORT–
–50
–55 –25 5 35 65 95 125 155 185 215
TEMPERATURE (°C)
Figure 28. Short-Circuit Current vs. Temperature, G = 1
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Rev. B | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet AD8229.PDF ] | |
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