Precision, Dual-Channel Instrumentation Amplifier Data Sheet AD8222 FEATURES FUNCTIONAL BLOCK DIAGRAM Two channels in small 4 mm 4 mm LFCSP Gain set with 1 resistor per amplifier (G = 1 to 10,000) 16 15 14 13 Low noise AD8222 IN1 1 12 IN2 8 nV/Hz at 1 kHz 2 11 RG1 RG2 0.25 V p-p (0.1 Hz to 10 Hz) 3 10 RG1 RG2 High accuracy dc performance (B grade) +IN1 4 9 +IN2 60 V maximum input offset voltage 0.3 V/C maximum input offset drift 5 6 7 8 1.0 nA maximum input bias current 126 dB minimum CMRR (G = 100) Figure 1. Excellent ac performance 140 kHz bandwidth (G = 100) 13 s settling time to 0.001% Differential output option (single channel) Fully specified Adjustable common-mode output Supply range: 2.3 V to 18 V APPLICATIONS Multichannel data acquisition for ECG and medical instrumentation Industrial process controls AD8222 maintains a minimum CMRR of 80 dB to 4 kHz for all Wheatstone bridge sensors grades at G = 1. High CMRR over frequency allows the AD8222 Differential drives for to reject wideband interference and line harmonics, greatly High resolution input ADCs simplifying filter requirements. The AD8222 also has a typical Remote sensors CMRR drift over temperature of just 0.07 V/V/C at G = 1. GENERAL DESCRIPTION The AD8222 operates on both single and dual supplies and only The AD8222 is a dual-channel, high performance instrumentation requires 2.2 mA maximum supply current for both amplifiers. amplifier that requires only one external resistor per amplifier It is specified over the industrial temperature range of 40C to to set gains of 1 to 10,000. +85C and is fully RoHS compliant. For a single-channel version, see the AD8221. The AD8222 is the first dual-instrumentation amplifier in the 1 Table 1. Instrumentation Amplifiers by Category small 4 mm 4mm LFCSP. It requires the same board area as a General- Military Low High typical single instrumentation amplifier. The smaller package Purpose Zero Drift Grade Power Speed PGA allows a 2 increase in channel density and a lower cost per AD8220 AD8231 AD620 AD8235 AD8250 channel, all with no compromise in performance. AD8221 AD8290 AD621 AD8236 AD8251 The AD8222 can also be configured as a single-channel, differen- AD8222 AD8293G80 AD524 AD627 AD8253 tial output instrumentation amplifier. Differential outputs provide AD8224 AD8553 AD526 AD623 high noise immunity, which can be useful when the output AD8228 AD8556 AD624 AD8223 signal must travel through a noisy environment, such as with AD8295 AD8557 AD8226 remote sensors. The configuration can also be used to drive AD8227 differential input analog-to-digital converters (ADCs). The 1 See www.analog.com for the latest selection of instrumentation amplifiers. Rev. B 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20062016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. +V +V S S REF1 OUT1 REF2 OUT2 V V S S 05947-001AD8222 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Package Considerations ............................................................. 16 Applications ....................................................................................... 1 Layout .......................................................................................... 16 Functional Block Diagram .............................................................. 1 Input Bias Current Return Path ............................................... 17 General Description ......................................................................... 1 Input Protection ......................................................................... 18 Revision History ............................................................................... 2 RF Interference ........................................................................... 18 Specifications ..................................................................................... 3 Common-Mode Input Voltage Range ..................................... 18 Absolute Maximum Ratings ............................................................ 6 Applications Information .............................................................. 19 Thermal Resistance ...................................................................... 6 Differential Output .................................................................... 19 ESD Caution .................................................................................. 6 Driving a Differential Input ADC ............................................ 20 Pin Configuration and Function Descriptions ............................. 7 Precision Strain Gage ................................................................. 20 Typical Performance Characteristics ............................................. 8 Driving Cabling .......................................................................... 21 Theory of Operation ...................................................................... 15 Outline Dimensions ....................................................................... 22 Amplifier Architecture .............................................................. 15 Ordering Guide .......................................................................... 23 Gain Selection ............................................................................. 15 Reference Terminal .................................................................... 16 REVISION HISTORY 5/2016Rev. A to Rev. B Changes to Thermal Resistance Section and Table 6 ................... 6 Changed CP-16-13 to CP-16-26 .................................. Throughout Changes to Figure 2 ........................................................................... 7 Change to Table 5 ............................................................................. 6 Changes to Figure 19 ...................................................................... 10 Changes to Figure 2 and Table 7 ..................................................... 7 Changes to Figure 43 ...................................................................... 14 Added Figure 3 Renumbered Sequentially .................................. 7 Changes to Reference Terminal Section, Figure 45, and Package Change to Input Protection Section ............................................. 18 Considerations Section .................................................................. 16 Updated Outline Dimensions ....................................................... 22 Deleted Thermal Pad Section ....................................................... 16 Changes to Ordering Guide .......................................................... 23 Added Package Without Thermal Pad and Package with Thermal Pad Sections .................................................................... 16 2/2010Rev. 0 to Rev. A Changes to Figure 46 ...................................................................... 17 Added LFCSP VQ, CP-16-13 Package ............................ Universal Deleted Solder Wash Section ........................................................ 17 Changes to Features Section and Table 1 ...................................... 1 Changes to RFI and Antialising Filter Section ........................... 20 Changed VIN+ to V+IN, VIN to VIN, and T to TA Throughout ..... 3 Updated Outline Dimensions ....................................................... 22 Change to Reference Input Parameter, Table 2 ............................. 4 Changes to Ordering Guide .......................................................... 23 Changed Output Short-Circuit Current to Output Short-Circuit Duration, Table 5 .............................................................................. 6 7/2006Revision 0: Initial Version Rev. B Page 2 of 24