AD8421 AD [Analog Devices], AD8421 Datasheet
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AD8421
Manufacturer Part Number
AD8421
Description
3 nV/?Hz, Low Power
Manufacturer
AD [Analog Devices]
Datasheet
1.AD8421.pdf
(28 pages)
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Data Sheet
FEATURES
Low power
Low noise
Excellent ac specifications
High precision dc performance (AD8421BRZ)
Inputs protected to 40 V from opposite supply
±2.5 V to ±18 V dual supply (5 V to 36 V single supply)
Gain set with a single resistor (G = 1 to 10,000)
APPLICATIONS
Medical instrumentation
Precision data acquisition
Microphone preamplification
Vibration analysis
Multiplexed input applications
ADC driver
GENERAL DESCRIPTION
The
bias current, high speed instrumentation amplifier that is ideally
suited for a broad spectrum of signal conditioning and data
acquisition applications. This product features extremely high
CMRR, allowing it to extract low level signals in the presence of
high frequency common-mode noise over a wide temperature
range.
The 10 MHz bandwidth, 35 V/μs slew rate, and 0.6 μs settling
time to 0.001% (G = 10) allow the
signals and excel in applications that require high channel count,
multiplexed systems. Even at higher gains, the current feedback
architecture maintains high performance; for example, at G = 100,
the bandwidth is 2 MHz and the settling time is 0.8 μs. The
AD8421
for use in demanding applications such as vibration analysis.
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.
Trademarks and registered trademarks are the property of their respective owners.
2.3 mA maximum supply current
3.2 nV/√Hz maximum input voltage noise at 1 kHz
200 fA/√Hz current noise at 1 kHz
10 MHz bandwidth (G = 1)
2 MHz bandwidth (G = 100)
0.6 μs settling time to 0.001% (G = 10)
80 dB CMRR at 20 kHz (G = 1)
35 V/μs slew rate
94 dB CMRR minimum (G = 1)
0.2 μV/°C maximum input offset voltage drift
1 ppm/°C maximum gain drift (G = 1)
500 pA maximum input bias current
AD8421
has excellent distortion performance, making it suitable
is a low cost, low power, extremely low noise, ultralow
AD8421
to amplify high speed
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The
200 fA/√Hz current noise with only 2 mA quiescent current,
making it an ideal choice for measuring low level signals. For
applications with high source impedance, the
innovative process technology and design techniques to provide
noise performance that is limited only by the sensor.
The
inputs while still maintaining very low noise. This protection
allows input voltages up to 40 V from the opposite supply rail
without damage to the part.
A single resistor sets the gain from 1 to 10,000. The reference
pin can be used to apply a precise offset to the output voltage.
The
performance curves to 125°C. It is available in 8-lead MSOP
and SOIC packages.
AD8421
AD8421
AD8421
100n
10µ
10n
1µ
1n
Instrumentation Amplifier
100
BEST AVAILABLE
1mA LOW POWER IN-AMP
G = 100
AD8421
delivers 3 nV/√Hz input voltage noise and
uses unique protection methods to ensure robust
is specified from −40°C to +85°C and has typical
Figure 2. Noise Density vs. Source Resistance
PIN CONNECTION DIAGRAM
–IN
+IN
R
R
G
G
3 nV/√Hz, Low Power
1
2
3
4
1k
SOURCE RESISTANCE, R
©2012 Analog Devices, Inc. All rights reserved.
(Not to Scale)
AD8421
TOP VIEW
R
S
Figure 1.
NOISE ONLY
10k
BEST AVAILABLE
7mA LOW NOISE IN-AMP
8
7
6
5
+V
V
REF
–V
S
OUT
(Ω)
S
S
100k
AD8421
AD8421
www.analog.com
employs
1M