Datasheet AD8422 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | High Performance, Low Power, Rail-to-Rail Precision Instrumentation Amplifier |
| Pages / Page | 24 / 1 — High Performance, Low Power, Rail-to-Rail. Precision Instrumentation … |
| Revision | A |
| File Format / Size | PDF / 655 Kb |
| Document Language | English |
High Performance, Low Power, Rail-to-Rail. Precision Instrumentation Amplifier. Data Sheet. AD8422. FEATURES. CONNECTION DIAGRAM
Model Line for this Datasheet
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High Performance, Low Power, Rail-to-Rail Precision Instrumentation Amplifier Data Sheet AD8422 FEATURES CONNECTION DIAGRAM Low power: 330 µA maximum quiescent current AD8422 Rail-to-rail output –IN 1 8 +VS Low noise and distortion RG 2 7 VOUT 8 nV/√Hz maximum input voltage noise at 1 kHz RG 3 6 REF 0.15 µV p-p RTI noise (G = 100) +IN 4 5 –VS 0.5 ppm nonlinearity with 2 kΩ load (G = 1)
001
TOP VIEW Excellent ac specifications (Not to Scale)
11197-
80 dB minimum CMRR at 10 kHz (G = 1)
Figure 1. 8-Lead MSOP (RM), 8-Lead SOIC (R)
2.2 MHz bandwidth (G = 1) –20 R High precision dc performance (AD8422BRZ) L = 2kΩ –30 VOUT = ±10V 150 dB minimum CMRR (G = 1000) –40 0.04% maximum gain error (G = 1000) –50 0.3 µV/°C maximum input offset drift –60 Bc) 0.5 nA maximum input bias current d ( –70 Wide supply range UDE –80 G = 1000 IT 4.6 V to 36 V single supply L –90 P ±2.3 V to ±18 V dual supply AM –100 G = 100 Input overvoltage protection: 40 V from opposite supply G = 10 –110 G = 1 Gain range: 1 to 1000 –120 –130 APPLICATIONS –140
102
Medical instrumentation 10 100 1k 5k FREQUENCY (Hz) Industrial process controls
11197- Figure 2. Total Harmonic Distortion vs. Frequency
Strain gages Transducer interfaces Precision data acquisition systems Channel-isolated systems Portable instrumentation GENERAL DESCRIPTION
The AD8422 is a high precision, low power, low noise, rail-to-rail The wide input range and rail-to-rail output of the AD8422 instrumentation amplifier that delivers the best performance bring all of the benefits of a high performance in-amp to single- per unit microampere in the industry. The AD8422 processes supply applications. Whether using high or low supply voltages, signals with ultralow distortion performance that is load the power savings make the AD8422 an excellent choice for independent over its full output range. high channel count or power sensitive applications on a very The AD8422 is the third generation development of the industry- tight error budget. standard AD620. The AD8422 employs new process technologies The AD8422 uses robust input protection that ensures reliability and design techniques to achieve higher dynamic range and without sacrificing noise performance. The AD8422 has high lower errors than its predecessors, while consuming less than ESD immunity, and the inputs are protected from continuous one-third of the power. The AD8422 uses the high performance voltages up to 40 V from the opposite supply rail. pinout introduced by the AD8221. A single resistor sets the gain from 1 to 1000. The reference pin Very low bias current makes the AD8422 error-free with high can be used to apply a precise offset to the output voltage. source impedance, allowing multiple sensors to be multiplexed The AD8422 is specified from −40°C to +85°C and has typical to the inputs. Low voltage noise and low current noise make the performance curves to 125°C. It is available in 8-lead MSOP AD8422 an ideal choice for measuring a Wheatstone bridge. and 8-lead SOIC packages.
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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2013–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS CONNECTION DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS SOIC PACKAGE MSOP PACKAGE ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ARCHITECTURE GAIN SELECTION RG Power Dissipation REFERENCE TERMINAL INPUT VOLTAGE RANGE LAYOUT Common-Mode Rejection Ratio over Frequency Power Supplies and Grounding Reference Pin INPUT BIAS CURRENT RETURN PATH INPUT VOLTAGES BEYOND THE SUPPLY RAILS Input Voltages Beyond the Maximum Ratings RADIO FREQUENCY INTERFERENCE (RFI) APPLICATIONS INFORMATION PRECISION BRIDGE CONDITIONING PROCESS CONTROL ANALOG INPUT OUTLINE DIMENSIONS ORDERING GUIDE
001
TOP VIEW Excellent ac specifications (Not to Scale)
11197-
80 dB minimum CMRR at 10 kHz (G = 1)
Figure 1. 8-Lead MSOP (RM), 8-Lead SOIC (R)
2.2 MHz bandwidth (G = 1) –20 R High precision dc performance (AD8422BRZ) L = 2kΩ –30 VOUT = ±10V 150 dB minimum CMRR (G = 1000) –40 0.04% maximum gain error (G = 1000) –50 0.3 µV/°C maximum input offset drift –60 Bc) 0.5 nA maximum input bias current d ( –70 Wide supply range UDE –80 G = 1000 IT 4.6 V to 36 V single supply L –90 P ±2.3 V to ±18 V dual supply AM –100 G = 100 Input overvoltage protection: 40 V from opposite supply G = 10 –110 G = 1 Gain range: 1 to 1000 –120 –130 APPLICATIONS –140
102
Medical instrumentation 10 100 1k 5k FREQUENCY (Hz) Industrial process controls
11197- Figure 2. Total Harmonic Distortion vs. Frequency
Strain gages Transducer interfaces Precision data acquisition systems Channel-isolated systems Portable instrumentation GENERAL DESCRIPTION
The AD8422 is a high precision, low power, low noise, rail-to-rail The wide input range and rail-to-rail output of the AD8422 instrumentation amplifier that delivers the best performance bring all of the benefits of a high performance in-amp to single- per unit microampere in the industry. The AD8422 processes supply applications. Whether using high or low supply voltages, signals with ultralow distortion performance that is load the power savings make the AD8422 an excellent choice for independent over its full output range. high channel count or power sensitive applications on a very The AD8422 is the third generation development of the industry- tight error budget. standard AD620. The AD8422 employs new process technologies The AD8422 uses robust input protection that ensures reliability and design techniques to achieve higher dynamic range and without sacrificing noise performance. The AD8422 has high lower errors than its predecessors, while consuming less than ESD immunity, and the inputs are protected from continuous one-third of the power. The AD8422 uses the high performance voltages up to 40 V from the opposite supply rail. pinout introduced by the AD8221. A single resistor sets the gain from 1 to 1000. The reference pin Very low bias current makes the AD8422 error-free with high can be used to apply a precise offset to the output voltage. source impedance, allowing multiple sensors to be multiplexed The AD8422 is specified from −40°C to +85°C and has typical to the inputs. Low voltage noise and low current noise make the performance curves to 125°C. It is available in 8-lead MSOP AD8422 an ideal choice for measuring a Wheatstone bridge. and 8-lead SOIC packages.
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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2013–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS CONNECTION DIAGRAM GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS SOIC PACKAGE MSOP PACKAGE ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ARCHITECTURE GAIN SELECTION RG Power Dissipation REFERENCE TERMINAL INPUT VOLTAGE RANGE LAYOUT Common-Mode Rejection Ratio over Frequency Power Supplies and Grounding Reference Pin INPUT BIAS CURRENT RETURN PATH INPUT VOLTAGES BEYOND THE SUPPLY RAILS Input Voltages Beyond the Maximum Ratings RADIO FREQUENCY INTERFERENCE (RFI) APPLICATIONS INFORMATION PRECISION BRIDGE CONDITIONING PROCESS CONTROL ANALOG INPUT OUTLINE DIMENSIONS ORDERING GUIDE
