High Voltage, Precision Difference Amplifier Data Sheet AD8208 FEATURES FUNCTIONAL BLOCK DIAGRAM V S A1 A2 Qualified for automotive applications EMI filters included EMI FILTER AD8208 High common-mode voltage range EMI 2 V to +45 V operating +IN + + FILTER G = 10 G = 2 OUT 24 V to +80 V survival EMI IN FILTER Buffered output voltage Gain = 20 V/V Low-pass filter (1-pole or 2-pole) Wide operating temperature range 40C to +125C for WB grade GND 40C to +150C for WH grade Figure 1. Excellent ac and dc performance 1 mV voltage offset 5 ppm/C typical gain drift 80 dB CMRR minimum dc to 10 kHz APPLICATIONS High-side current sensing Motor controls Solenoid controls Power management Low-side current sensing Diagnostic protection GENERAL DESCRIPTION The AD8208 is a single-supply difference amplifier ideal for Automotive applications demand robust, precision components for amplifying and low-pass filtering small differential voltages in the improved system control. The AD8208 provides excellent ac and presence of a large common-mode voltage. The input common- dc performance, minimizing errors in the application. Typical mode voltage range extends from 2 V to +45 V at a single +5 V offset and gain drift in both the SOIC and MSOP packages are supply. The AD8208 is qualified for automotive applications. The less than 5 V/C and 10 ppm/C, respectively. The device also amplifier offers enhanced input overvoltage and ESD protection, delivers a minimum CMRR of 80 dB from dc to 10 kHz. and includes EMI filtering. The AD8208 features an externally accessible 100 k resistor at the output of the preamplifier (A1), which can be used for low- pass filtering and for establishing gains other than 20. Rev. C 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. 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Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 08714-001AD8208 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Applications Information .............................................................. 12 Applications ....................................................................................... 1 High-Side Current Sensing with a Low-Side Switch ............. 12 Functional Block Diagram .............................................................. 1 High-Rail Current Sensing ....................................................... 12 General Description ......................................................................... 1 Low-Side Current Sensing ........................................................ 12 Revision History ............................................................................... 2 Gain Adjustment ........................................................................ 13 Specifications ..................................................................................... 3 Gain Trim .................................................................................... 13 Absolute Maximum Ratings ............................................................ 5 Low-Pass Filtering ...................................................................... 14 ESD Caution .................................................................................. 5 High Line Current Sensing with LPF and Gain Adjustment 15 Pin Configuration and Function Descriptions ............................. 6 Outline Dimensions ....................................................................... 16 Typical Performance Characteristics ............................................. 7 Ordering Guide .......................................................................... 17 Theory of Operation ...................................................................... 11 Automotive Products ................................................................. 17 REVISION HISTORY 12/13-----Rev. B to Rev. C 5/10Rev. 0 to Rev. A Changes to Table 1 ............................................................................ 3 Added 8-Lead MSOP ........................................................ Universal Change to Table 2 ............................................................................. 5 Changes to Features Section and General Description Section .. 1 Changes to Ordering Guide .......................................................... 17 Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 15 2/13Rev. A to Rev. B Changes to Features .......................................................................... 1 1/10Revision 0: Initial Version Changes to Table 1 ............................................................................ 3 Changes to Table 4 ............................................................................ 4 Moved Ordering Guide .................................................................. 16 Changes to Ordering Guide .......................................................... 16 Added Automotive Products Section .......................................... 16 Rev. C Page 2 of 20