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AD8429 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer AD8429
Beschreibung Low Noise Instrumentation Amplifier
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 20 Seiten
AD8429 Datasheet, Funktion
www.DataSheet4U.net
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.






AD8429 Datasheet, Funktion
AD8429
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Rating
Supply Voltage
±18 V
Output Short-Circuit Current Duration Indefinite
Maximum Voltage at –IN, +IN1
Differential Input Voltage1
±VS
Gain ≤ 4
4 > Gain > 50
±VS
±50 V/gain
Gain ≥ 50
±1 V
Maximum Voltage at REF
Storage Temperature Range
±VS
−65°C to +150°C
Specified Temperature Range
−40°C to +125°C
Maximum Junction Temperature
140°C
ESD
Human Body Model
3.0 kV
Charge Device Model
1.5 kV
Machine Model
0.2 kV
1 For voltages beyond these limits, use input protection resistors. See the
Theory of Operation section for more information.
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
THERMAL RESISTANCE
θJA is specified for a device in free air using a 4-layer JEDEC
printed circuit board (PCB).
Table 3.
Package
8-Lead SOIC
θJA Unit
121 °C/W
ESD CAUTION
Rev. 0 | Page 6 of 20

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AD8429 pdf, datenblatt
AD8429
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1 10 100 1k 10k 100k
FREQUENCY (Hz)
Figure 28. Current Noise Spectral Density vs. Frequency
50pA/DIV
1s/DIV
Figure 29. 0.1 Hz to 10 Hz Current Noise
30
25 VS = ±15V
G=1
20
15
10
VS = ±5V
5
0
100 1k 10k 100k 1M
FREQUENCY (Hz)
Figure 30. Large Signal Frequency Response
10M
5V/DIV
0.002%/DIV
750ns TO 0.01%
872ns TO 0.001%
TIME (µs)
2µs/DIV
Figure 31. Large Signal Pulse Response and Settling Time (G = 1), 10 V Step,
VS = ±15 V
5V/DIV
0.002%/DIV
640ns TO 0.01%
896ns TO 0.001%
2µs/DIV
TIME (µs)
Figure 32. Large Signal Pulse Response and Settling Time (G = 10), 10 V Step,
VS = ±15 V
5V/DIV
0.002%/DIV
840ns TO 0.01%
1152ns TO 0.001%
TIME (µs)
2µs/DIV
Figure 33. Large Signal Pulse Response and Settling Time (G = 100),
10 V Step, VS = ±15 V
Rev. 0 | Page 12 of 20

12 Page





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