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AD8231WACPZ-RL Arkusz danych(PDF) 1 Page - Analog Devices

Numer części AD8231WACPZ-RL
Szczegółowy opis  Zero Drift, Digitally Programmable Instrumentation Amplifier
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Zero Drift, Digitally Programmable
Instrumentation Amplifier
Data Sheet
AD8231
Rev. C
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
©2007–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
FEATURES
Digitally/pin-programmable gain
G = 1, 2, 4, 8, 16, 32, 64, or 128
Specified from −40°C to +125°C
50 nV/°C maximum input offset drift
10 ppm/°C maximum gain drift
Excellent dc performance
80 dB minimum CMR, G = 1
15 μV maximum input offset voltage
500 pA maximum bias current
0.7 μV p-p noise (0.1 Hz to 10 Hz)
Good ac performance
2.7 MHz bandwidth, G = 1
1.1 V/μs slew rate
Rail-to-rail output
Shutdown/multiplex
Extra op amp
Single-supply range: 3 V to 5 V
Dual-supply range: ±1.5 V to ±2.5 V
Qualified for automotive applications
APPLICATIONS
Pressure and strain transducers
Thermocouples and RTDs
Programmable instrumentation
Industrial controls
Weigh scales
Automotive controls
FUNCTIONAL BLOCK DIAGRAM
IN-AMP
LOGIC
NC
1
–INA
2
+INA
3
NC
4
+VS
12
–VS
11
OUTA
10
REF
9
OP
AMP
AD8231
Figure 1.
Table 1. Instrumentation and Difference Amplifiers by
Category
High
Performance
Low
Cost
High
Voltage
Mil
Grade
Low
Power
Digital
Gain
AD8221
AD6231
AD628
AD620
AD6271
AD82311
AD82201
AD85531
AD629
AD621
AD8250
AD8222
AD524
AD8251
AD82241
AD526
AD85551
AD624
AD85561
AD85571
1 Rail-to-rail output.
GENERAL DESCRIPTION
The AD8231 is a low drift, rail-to-rail, instrumentation amplifier
with software-programmable gains of 1, 2, 4, 8, 16, 32, 64, or 128.
The gains are programmed via digital logic or pin strapping.
The AD8231 is ideal for applications that require precision
performance over a wide temperature range, such as industrial
temperature sensing and data logging. Because the gain setting
resistors are internal, maximum gain drift is only 10 ppm/°C for
gains of 1 to 32. Because of the auto-zero input stage, maximum
input offset is 15 μV and maximum input offset drift is just
50 nV/°C. CMRR is 80 dB for G = 1, increasing to 110 dB at
higher gains.
The AD8231 also includes an uncommitted op amp that can be
used for additional gain, differential signal driving, or filtering.
Like the in-amp, the op amp has an auto-zero architecture, rail-
to-rail input, and rail-to-rail output.
The AD8231 includes a shutdown feature that reduces current
to a maximum of 1 μA. In shutdown, both amplifiers also have
a high output impedance, which allows easy multiplexing of
multiple amplifiers without additional switches.
The AD8231 is specified over the extended industrial tempera-
ture range of −40°C to +125°C. It is available in a 4 mm × 4 mm
16-lead LFCSP.


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