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AD8290ACPZ-RL

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21
G = 50, CMOS Sensor Amplifier
with Current Excitation
AD8290
Rev. B
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FEATURES
Supply voltage range: 2.6 V to 5.5 V
Low power
1.2 mA + 2× excitation current
0.5 μA shutdown current
Low input bias current: ±100 pA
High CMRR: 120 dB
Space savings: 16-lead, 3.0 mm × 3.0 mm × 0.55 mm LFCSP
Excitation current
300 μA to 1300 μA range
Set with external resistor
APPLICATIONS
Bridge and sensor drives
Portable electronics
GENERAL DESCRIPTION
The AD8290 contains both an adjustable current source to
drive a sensor and a difference amplifier to amplify the signal
voltage. The amplifier is set for a fixed gain of 50. The AD8290
is an excellent solution for both the drive and the sensing aspects
required for pressure, temperature, and strain gage bridges.
In addition, because the AD8290 operates with low power,
works with a range of low supply voltages, and is available in a
low profile package, it is suitable for drive/sense circuits in
portable electronics as well.
The AD8290 is available in a lead free 3.0 mm × 3.0 mm ×
0.55 mm package and is operational over the industrial
temperature range of −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
V
REF
14
15
13
11 6 5 3
4
10
2
ADC
ANTI-
ALIASING
FILTER
V
CC
GND
ENBL
C
FILTER
R
SET
06745-001
AD8290
C
BRIDGE
NC NCNCNC NC NC
161 1297 8
Figure 1.
AD8290* PRODUCT PAGE QUICK LINKS
Last Content Update: 02/23/2017
COMPARABLE PARTS
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DOCUMENTATION
Data Sheet
• AD8290: G = 50, CMOS Sensor Amplifier with Current
Excitation Data Sheet
Technical Books
• A Designer's Guide to Instrumentation Amplifiers, 3rd
Edition, 2006
REFERENCE MATERIALS
Technical Articles
• Auto-Zero Amplifiers
• High-performance Adder Uses Instrumentation Amplifiers
DESIGN RESOURCES
• AD8290 Material Declaration
• PCN-PDN Information
• Quality And Reliability
• Symbols and Footprints
DISCUSSIONS
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SAMPLE AND BUY
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TECHNICAL SUPPORT
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number.
DOCUMENT FEEDBACK
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AD8290
Rev. B | Page 2 of 20
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 14
Amplifier...................................................................................... 14
High Power Supply Rejection (PSR) and Common-Mode
Rejection (CMR) ........................................................................ 14
1/f Noise Correction .................................................................. 14
Current Source............................................................................ 15
Applications Information.............................................................. 16
Typical Connections .................................................................. 16
Current Excitation...................................................................... 16
Enable/Disable Function ........................................................... 16
Output Filtering.......................................................................... 16
Clock Feedthrough..................................................................... 16
Maximizing Performance Through Proper Layout ............... 17
Power Supply Bypassing ............................................................ 17
Dual-Supply Operation ............................................................. 17
Pressure Sensor Bridge Application......................................... 18
Temperature Sensor Application.............................................. 19
ADC/Microcontroller................................................................ 19
Outline Dimensions ....................................................................... 20
Ordering Guide .......................................................................... 20
REVISION HISTORY
2/08—Rev. SpA to Rev. B
Changes to Features Section............................................................ 1
Changes to Amplifier Section and Figure 43 .............................. 14
Changes to Current Source Section ............................................. 15
Changes to Current Excitation Section, Output Filtering
Section, Clock Feedthrough Section, and Figure 45.................. 16
Changes to Figure 46...................................................................... 17
8/07—Revision SpA
7/07—Revision 0: Initial Version
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