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Analog Devices Semiconductor Electronic Components Datasheet

AD8231-EP Datasheet

Digitally Programmable Instrumentation Amplifier

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Data Sheet
FEATURES
Digitally/pin-programmable gain
G = 1, 2, 4, 8, 16, 32, 64, or 128
Specified from −55°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 6 V
Dual-supply range: ±1.5 V to ±3 V
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC
standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
One assembly/test site
One fabrication site
Enhanced product change notification
Qualification data available on request
Zero Drift, Digitally Programmable
Instrumentation Amplifier
AD8231-EP
FUNCTIONAL BLOCK DIAGRAM
NC 1
–INA 2
+INA 3
LOGIC
IN-AMP
NC 4
AD8231-EP
OP
AMP
12 +VS
11 –VS
10 OUTA
9 REF
Figure 1.
Table 1. Instrumentation and Difference Amplifiers by
Category
High
Low
Performance Cost
High
Mil
Low
Digital
Voltage Grade Power 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-EP 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-EP 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-EP 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-EP 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-EP is specified over the military temperature
range of −55°C to +125°C. It is available in a 4 mm × 4 mm 16-
lead LFCSP.
Additional application and technical information can be found
in the AD8231 data sheet.
Rev. A
Document Feedback
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2011–2017 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD8231-EP Datasheet

Digitally Programmable Instrumentation Amplifier

No Preview Available !

AD8231-EP
TABLE OF CONTENTS
Features .............................................................................................. 1
Enhanced Product Features ............................................................ 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 7
Thermal Resistance ...................................................................... 7
Maximum Power Dissipation ..................................................... 7
REVISION HISTORY
11/2017—Rev. 0 to Rev. A
Changed CP-16-4 to CP-16-17 .................................... Throughout
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 18
5/2011—Revision 0: Initial Version
Data Sheet
ESD Caution...................................................................................7
Pin Configuration and Function Descriptions..............................8
Typical Performance Characteristics ..............................................8
Instrumentation Amplifier Performance Curves......................9
Operational Amplifier Performance Curves .......................... 15
Performance Curves Valid for Both Amplifiers..................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. A | Page 2 of 20



Part Number AD8231-EP
Description Digitally Programmable Instrumentation Amplifier
Maker Analog Devices
Total Page 3 Pages
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