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PDF AD8429 Data sheet ( Hoja de datos )
| Número de pieza | AD8429 | |
| Descripción | Low Noise Instrumentation Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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FEATURES
Low noise
1 nV/√Hz input noise
45 nV/√Hz output noise
High accuracy dc performance (AD8429BRZ)
90 dB CMRR minimum (G = 1)
50 μV maximum input offset voltage
0.02% maximum gain accuracy (G = 1)
Excellent ac specifications
80 dB CMRR to 5 kHz (G = 1)
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 ±18 V dual supply
Gain set with a single resistor (G = 1 to 10,000)
Temperature range for specified performance
−40°C to +125°C
APPLICATIONS
Medical instrumentation
Precision data acquisition
Microphone preamplification
Vibration analysis
GENERAL DESCRIPTION
The AD8429 is an ultralow noise, instrumentation amplifier
designed for measuring extremely small signals over a wide
temperature range (−40°C to +125°C).
The AD8429 excels at measuring tiny signals. It delivers ultralow
input noise performance of 1 nV/√Hz. The high CMRR of the
AD8429 prevents unwanted signals from corrupting the acqui-
sition. The CMRR increases as the gain increases, offering high
rejection when it is most needed. The high performance pin
configuration of the AD8429 allows it to reliably maintain high
CMRR at frequencies well beyond those of typical instrumentation
amplifiers.
The AD8429 reliably amplifies fast changing signals. Its current
feedback architecture provides high bandwidth at high gain, for
example, 1.2 MHz at G = 100. The design includes circuitry to im-
prove settling time after large input voltage transients. The AD8429
was designed for excellent distortion performance, allowing use in
demanding applications such as vibration analysis.
Gain is set from 1 to 10,000 with a single resistor. A reference
pin allows the user to offset the output voltage. This feature can
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.
1 nV/√Hz Low Noise
Instrumentation Amplifier
AD8429
PIN CONNECTION DIAGRAM
–IN 1
RG 2
RG 3
+IN 4
AD8429
TOP VIEW
(Not to Scale)
Figure 1.
8 +VS
7 VOUT
6 REF
5 –VS
be useful to shift the output level when interfacing to a single
supply signal chain.
The AD8429 performance is specified over the extended industrial
temperature range of −40°C to +125°C. It is available in an 8-lead
plastic SOIC package.
1000
100
G=1
10
G = 10
G = 100
1 G = 1k
0.1
1
10 100 1k 10k 100k
FREQUENCY (Hz)
Figure 2. RTI Voltage Noise Spectral Density vs. Frequency
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 Analog Devices, Inc. All rights reserved.
1 page  
AD8429
A Grade
B Grade
Parameter
Test Conditions/Comments Min
Typ Max
Min
Typ Max
Unit
POWER SUPPLY
Operating Range
±4 ±18 ±4
±18 V
Quiescent Current
6.7 7
6.7 7
mA
T = 125°C
9 9 mA
TEMPERATURE RANGE
For Specified Performance
−40
+125
−40
+125
°C
1 Total voltage noise = √(eni2 + (eno/G)2 + eRG2). See the Theory of Operation section for more information.
2 Total RTI VOS = (VOSI) + (VOSO/G).
3 These specifications do not include the tolerance of the external gain setting resistor, RG. For G > 1, add RG errors to the specifications given in this table.
4 Differential and common-mode input impedance can be calculated from the pin impedance: ZDIFF = 2(ZPIN); ZCM = ZPIN/2.
5 Input voltage range of the AD8429 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.
Rev. 0 | Page 5 of 20
5 Page 
15
VS = ±15V
10
5
+125°C
0
+85°C
+25°C
–40°C
–5
–10
–15
100
1k 10k
LOAD (Ω)
100k
Figure 22. Output Voltage Swing vs. Load Resistance
+VS VS = ±15V
–0.4
–0.8
–1.2
–1.6
+2.0
+1.6
+1.2
+0.8
+0.4
–VS
10µ
100µ
1m
OUTPUT CURRENT (A)
+125°C
+85°C
+25°C
–40°C
10m
Figure 23. Output Voltage Swing vs. Output Current
10
GAIN = 1
8
6
4
2
0
–2
–4
–6
–8
–10
–10 –8 –6 –4 –2 0 2 4 6 8
OUTPUT VOLTAGE (V)
Figure 24. Gain Nonlinearity (G = 1), RL = 10 kΩ
10
AD8429
10
GAIN = 1000
8
6
4
2
0
–2
–4
–6
–8
–10
–10 –8 –6 –4 –2 0 2 4 6 8 10
OUTPUT VOLTAGE (V)
Figure 25. Gain Nonlinearity (G = 1000), RL = 10 kΩ
1000
100
G=1
10
G = 10
G = 100
1 G = 1k
0.1
1
10 100 1k 10k 100k
FREQUENCY (Hz)
Figure 26. RTI Voltage Noise Spectral Density vs. Frequency
GAIN = 1000, 100nV/DIV
GAIN = 1, 2μV/DIV
1s/DIV
Figure 27. 0.1 Hz to 10 Hz RTI Voltage Noise (G = 1, G = 1000)
Rev. 0 | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD8429.PDF ] | |
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