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AD8420 Fiches technique(PDF) 1 Page - Analog Devices

No de pièce AD8420
Description  Wide Supply Range, Micropower, Rail-to-Rail Instrumentation Amplifier
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD8420 Fiches technique(HTML) 1 Page - Analog Devices

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Wide Supply Range, Micropower,
Rail-to-Rail Instrumentation Amplifier
Data Sheet
AD8420
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
©2012–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Maximum supply current: 90 μA
Minimum CMRR: 100 dB
Drives heavy capacitive loads: ~700 pF
Rail-to-rail output
Input voltage range goes below ground
Gain set with 2 external resistors
Can achieve low gain drift at any gain
Very wide power supply range
Single supply: 2.7 V to 36 V
Dual supply: ±2.7 V to ±18 V
Bandwidth (G = 100): 2.5 kHz
Input voltage noise: 55 nV/√Hz
High dc precision
Maximum offset voltage: 125 μV
Maximum offset drift: 1 μV/°C
Maximum differential input voltage: ±1 V
8-lead MSOP package
APPLICATIONS
Bridge amplifiers
Pressure measurement
Medical instrumentation
Portable data acquisition
Multichannel systems
PIN CONFIGURATION
NC
1
+IN
2
–IN
3
–VS 4
VOUT
8
FB
7
REF
6
+VS
5
AD8420
TOP VIEW
(Not to Scale)
+
+
Figure 1.
Table 1. Instrumentation Amplifiers by Category1
General
Purpose
Zero Drift
Military
Grade
Low
Power
Digital
Gain
AD8221, AD8222
AD8231
AD620
AD8420
AD8250
AD8220, AD8224
AD8290
AD621
AD8235
AD8251
AD8236
AD8226, AD8227
AD8293G80,
AD8293G160
AD524
AD627
AD8253
AD8228
AD8553
AD526
AD8226
AD8231
AD8227
AD8295, AD8224
AD8556
AD624
AD623
AD8557
AD8223
1 See www.analog.com for the latest instrumentation amplifiers.
GENERAL DESCRIPTION
The AD8420 is a low cost, micropower, wide supply range,
instrumentation amplifier with a rail-to-rail output and a novel
architecture that allows for extremely flexible design. It is optimized
to amplify small differential voltages in the presence of large
common-mode signals.
The AD8420 is based on an indirect current feedback architecture
that gives it an excellent input common-mode range. Unlike
conventional instrumentation amplifiers, the AD8420 can easily
amplify signals at or even slightly below ground without requiring
dual supplies. The AD8420 has rail-to-rail output, and the output
voltage swing is completely independent of the input common-
mode voltage.
Single-supply operation, micropower current consumption, and
rail-to-rail output swing make the AD8420 ideal for battery-
powered applications. Its rail-to-rail output stage maximizes
dynamic range when operating from low supply voltages. Dual-
supply operation (±15 V) and low power consumption make
the AD8420 ideal for a wide variety of applications in medical
or industrial instrumentation.
The AD8420 is available in an 8-lead MSOP package. Performance
is specified over the full temperature range of −40°C to +85°C,
and the device is operational from −40°C to +125°C.


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