AD8206YCSURF

Single-Supply, 42 V System Difference Amplifier AD8206 FEATURES Ideal for current shunt applications High common-mode voltage range −2 V to +65 V operating −5 V to +68 V survival Gain = 20 Wide operating temperature range Die: −40°C to +150°C 8-lead SOIC: −40°C to +125°C Adjustable offset Available in SOIC and die form FUNCTIONAL BLOCK DIAGRAM V+ 6 +IN 8 5 OUT –IN 1 AD8206 7 VREF1 3 NC 4 2 VREF2 EXCELLENT AC AND DC PERFORMANCE 15 μV/°C offset drift 30 ppm/°C gain drift 80 dB CMRR dc to 20 kHz NC = NO CONNECT GND Figure 1. APPLICATIONS High-side current sensing in Motor controls Transmission controls Diesel-injection controls Engine management Suspension controls Vehicle dynamic controls DC-to-dc converters GENERAL DESCRIPTION The AD8206 is a single-supply difference amplifier for amplifying small differential voltages in the presence of large common-mode voltages. The operating input common-mode voltage range extends from −2 V to +65 V. The typical singlesupply voltage is 5 V. The AD8206 is offered in die and packaged form. The operating temperature range for the die is 25°C higher (up to 150°C) than the packaged part to enable the user to apply the AD8206 in high temperature applications. Excellent DC performance over temperature keeps errors in the measurement loop to a minimum. Offset drift is typically less than 15 μV/°C, and gain drift is typically below 30 ppm/°C. The output offset can be adjusted from 0.08 V to 4.7 V with a 5 V supply by using the VREF1 and VREF2 pins. With VREF1 attached to the V+ pin, and VREF2 attached to the GND pin, the output is set at half scale. Attaching both pins to GND causes the output to be unipolar, starting near ground. Attaching both pins to V+ causes the output to be unipolar starting near V+. Other offsets can be obtained by applying an external voltage to the VREF1 and VREF2 pins. Rev. 0 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 license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2005 Analog Devices, Inc. All rights reserved. 04953-001 AD8206 TABLE OF CONTENTS Features .............................................................................................. 1 Excellent AC and DC Performance................................................ 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ........................................................................ 8 Output Offset Adjustment............................................................... 9 Unidirectional Operation.............................................................9 Ground Referenced Output .........................................................9 V+ Referenced Output .................................................................9 Bidirectional Operation................................................................9 External ReferenceD Output .................................................... 10 Splitting the Supply .................................................................... 10 Splitting an External Reference ................................................ 10 Applications..................................................................................... 11 High-Side Current Sense with a Low-Side Switch................. 11 High-Side Current Sense with a High-Side Switch ............... 11 Outline Dimensions ....................................................................... 12 Ordering Guide .......................................................................... 12 REVISION HISTORY 7/05—Revision 0: Initial Version Rev. 0 | Page 2 of 12 AD8206 SPECIFICATIONS TA = operating temperature range, VS = 5 V, unless otherwise noted. Table 1. Parameter GAIN Initial Accuracy Accuracy Over Temperature Gain vs. Temperature VOLTAGE OFFSET Offset Voltage (RTI) Over Temperature (RTI) Offset Drift INPUT Input Impedance Differential Common Mode Input Voltage Range Common-Mode Rejection Conditions AD8206 SOIC Min Typ Max 20 VO ≥ 0.1 V dc, 25°C Specified temperature range 30 25°C Specified temperature range 15 ±2 ±4.5 15 ±1 ±1.2 30 ±2.5 ±6 Min AD8206 DIE Typ Max 20 ±1 ±1.3 Unit V/V % % ppm/°C mV mV μV/°C 400 200 Common mode, continuous Differential 1 25°C, f = dc to 20 kHz 2 Operating temperature range, f = dc to 20 kHz2 RL = 25 kΩ −2 76 76 250 86 80 +65 −2 76 76 400 200 +65 250 86 80 kΩ kΩ V mV dB dB OUTPUT Output Voltage Range Output Resistance DYNAMIC RESPONSE Small Signal −3 dB Bandwidth Slew Rate NOISE 0.1 Hz to 10 Hz, RTI Spectral Density, 1 kHz, RTI OFFSET ADJUSTMENT Ratiometric Accuracy 3 Accuracy, RTO Output Offset Adjustment Range VREF Input Voltage Range VREF Divider Resistor Values POWER SUPPLY Operating Range Quiescent Current Over Temperature Power Supply Rejection Ratio Temperature Range For Specified Performance 1 2 3 0.08 200 100 0.5 20 0.5 4.7 0.08 200 100 0.5 20 0.5 4.7 V Ω kHz V/μs μV p-p μV/√Hz Divider to supplies Voltage applied to VREF1 and VREF2 in parallel VS = 5 V 0.497 0.503 ±2 4.7 VS 40 5.5 2 0.497 0.503 ±2 4.7 VS 40 5.5 2 V/V mV/V V V kΩ V mA dB °C 0.08 0.0 24 4.5 32 0.08 0.0 24 4.5 70 32 VO = 0.1 V dc 70 Operating temperature range −40 +125 −40 +150 Input voltage range = ±125 mV with half-scale offset. Source imbalance