1 nV/Hz Low Noise 210C Instrumentation Amplifier Data Sheet AD8229 FEATURES FUNCTIONAL BLOCK DIAGRAM Designed and guaranteed for 210C operation AD8229 IN 1 8 +V S Low noise 2 7 R V G OUT 1 nV/Hz input noise R 3 6 REF G 45 nV/Hz output noise 4 5 +IN V S High CMRR 126 dB CMRR (minimum), G = 100 TOP VIEW (Not to Scale) 80 dB CMRR (minimum) to 5 kHz, G = 1 Figure 1. Excellent ac specifications 100 15 MHz bandwidth (G = 1) 80 1.2 MHz bandwidth (G = 100) 22 V/s slew rate 60 THD: 130 dBc (1 kHz, G = 1) 40 Versatile 20 4 V to 17 V dual supply 0 Gain set with single resistor (G = 1 to 1000) 20 Specified temperature range 40C to +210C, SBDIP package 40 40C to +175C, SOIC package 60 80 APPLICATIONS 100 Down-hole instrumentation 55 35 15 5 25 45 65 85 105 125 145 165 185 205 225 Harsh environment data acquisition TEMPERATURE (C) Exhaust gas measurements Figure 2. Typical Input Offset vs. Temperature (G = 100) Vibration analysis GENERAL DESCRIPTION The AD8229 is an ultralow noise instrumentation amplifier bandwidth at high gain, for example, 1.2 MHz at G = 100. The designed for measuring small signals in the presence of large design includes circuitry to improve settling time after large common-mode voltages and high temperatures. input voltage transients. The AD8229 was designed for excellent distortion performance, allowing use in demanding applications The AD8229 has been designed for high temperature operation. such as vibration analysis. The process is dielectrically isolated to avoid leakage currents at high temperatures. The design architecture was chosen to Gain is set from 1 to 1000 with a single resistor. A reference pin compensate for the low V voltages at high temperatures. allows the user to offset the output voltage. This feature can be BE useful when interfacing with analog-to-digital converters. The AD8229 excels at measuring tiny signals. It delivers industry leading 1 nV/Hz input noise performance. The high CMRR of For the most demanding applications, the AD8229 is available the AD8229 prevents unwanted signals from corrupting the in an 8-lead side-brazed ceramic dual in-line package (SBDIP). acquisition. The CMRR increases as the gain increases, offering For space-constrained applications, the AD8229 is available in high rejection when it is most needed. an 8-lead plastic standard small outline package (SOIC). The AD8229 is one of the fastest instrumentation amplifiers available. Its current feedback architecture provides high Rev. B 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20112012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. V (V) OSI 09412-001 09412-016AD8229 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 17 Applications ....................................................................................... 1 Architecture ................................................................................ 17 Functional Block Diagram .............................................................. 1 Gain Selection ............................................................................. 17 General Description ......................................................................... 1 Reference Terminal .................................................................... 17 Revision History ............................................................................... 2 Input Voltage Range ................................................................... 18 Specifications ..................................................................................... 3 Layout .......................................................................................... 18 Absolute Maximum Ratings ............................................................ 6 Input Bias Current Return Path ............................................... 19 Predicted Lifetime vs. Operating Temperature ........................ 6 Input Protection ......................................................................... 19 Thermal Resistance ...................................................................... 6 Radio Frequency Interference (RFI) ........................................ 19 ESD Caution .................................................................................. 6 Calculating the Noise of the Input Stage ................................. 20 Pin Configuration and Function Descriptions ............................. 7 Outline Dimensions ....................................................................... 21 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 21 REVISION HISTORY 2/12Rev. A to Rev. B Added 8-Lead SOIC ........................................................... Universal Changes to Features Section and General Description Section...... 1 Changes to Table 1 ............................................................................ 3 Changes to Table 2, Thermal Resistance Section, and Table 3 ... 6 Updated Outline Dimensions ....................................................... 21 Changes to Ordering Guide .......................................................... 21 9/11Rev. 0 to Rev. A Changes to Features Section and General Description Section...... 1 Changes to Table 2 ............................................................................ 6 Added Predicted Lifetime vs. Operating Temperature Section and Figure 3 Renumbered Sequentially .............................................. 6 Changes to Figure 18 and Figure 19 ............................................. 10 Changes to Figure 24 to Figure 28 ................................................ 11 Changes to Figure 29 and Figure 30 ............................................. 12 Changes to Figure 48 ...................................................................... 15 Changes to Figure 56 ...................................................................... 17 Changes to Power Supplies Section .............................................. 18 1/11Revision 0: Initial Version Rev. B Page 2 of 24