AD8211WYRJZ-RL

High Voltage, Current Shunt Monitor AD8211 Data Sheet FUNCTIONAL BLOCK DIAGRAM Qualified for automotive applications ±4000 V human body model (HBM) electrostatic discharge (ESD) High common-mode input voltage range: −2 V to +65 V Continuous input voltage range: −3 V to +68 V Buffered output voltage Wide operating temperature range 5-lead SOT: −40°C to +125°C Excellent ac and dc performance 5 µV/°C typical offset drift −13 ppm/°C typical gain vs. temperature 120 dB typical common-mode rejection ratio (CMRR) at dc VIN+ VIN– V+ A1 PROPRIETARY OFFSET CIRCUITRY OUT G = +20 AD8211 APPLICATIONS GND High-side current sensing Motor controls Transmission controls Engine management Suspension controls Vehicle dynamic controls DC-to-dc converters 06824-001 FEATURES Figure 1. GENERAL DESCRIPTION The AD8211 is a high voltage, precision current shunt amplifier. It features a set gain of 20 V/V, with a typical ±0.35% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. Excellent commonmode rejection from −2 V to +65 V is independent of the 5 V supply. The AD8211 performs unidirectional current measurements across a shunt resistor in a variety of industrial and automotive applications, such as motor control, solenoid control, or battery management. Rev. C Special circuitry is devoted to output linearity being maintained throughout the input differential voltage range of 0 mV to 250 mV, regardless of the common-mode voltage present. The AD8211 has an operating temperature range of −40°C to +125°C and is offered in a small 5-lead SOT package. 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 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 ©2007–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD8211 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Application Notes ........................................................................... 11  Applications ....................................................................................... 1  Output Linearity ......................................................................... 11  Functional Block Diagram .............................................................. 1  Applications Information .............................................................. 12  General Description ......................................................................... 1  High-Side Current Sense with a Low-Side Switch ................. 12  Revision History ............................................................................... 2  High-Side Current Sensing ....................................................... 12  Specifications..................................................................................... 3  Low-Side Current Sensing ........................................................ 12  Absolute Maximum Ratings............................................................ 4  Outline Dimensions ....................................................................... 13  ESD Caution .................................................................................. 4  Ordering Guide .......................................................................... 13  Pin Configuration and Function Descriptions ............................. 5  Automotive Products ................................................................. 13  Typical Performance Characteristics ............................................. 6  Theory of Operation ...................................................................... 10  REVISION HISTORY 12/2016—Rev. B to Rev. C Changes to Figure 27 ........................................................................... 11/2015—Rev. A to Rev. B Changes to Figure 3 .......................................................................... 5 Changes to Figure 25 to Figure 27 ................................................ 12 Changes to General Description, Gain Error Percentage ............1 Changes to Table 1.............................................................................3 Changes to Table 2.............................................................................4 Updated Outline Dimensions ....................................................... 13 Changes to Ordering Guide .......................................................... 13 7/2007—Revision 0: Initial Version 3/2011—Rev. 0 to Rev. A Added Automotive Products Information ................. Throughout Rev. C | Page 2 of 13 Data Sheet AD8211 SPECIFICATIONS TOPR = −40°C to +125°C, TA = 25°C, VS = 5 V, RL = 25 kΩ (RL is the output load resistor), unless otherwise noted. Table 1. Parameter GAIN Initial Accuracy Accuracy Over Temperature Gain vs. Temperature VOLTAGE OFFSET Offset Voltage, Referred to Input (RTI) Over Temperature (RTI) Offset Drift INPUT Input Impedance Differential Common Mode Common-Mode Input Voltage Range Differential Input Voltage Range Common-Mode Rejection OUTPUT Output Voltage Range Low Output Voltage Range High Output Impedance DYNAMIC RESPONSE Small Signal −3 dB Bandwidth Slew Rate NOISE 0.1 Hz to 10 Hz, RTI Spectral Density, 1 kHz, RTI POWER SUPPLY Operating Range Quiescent Current over Temperature Power Supply Rejection Ratio TEMPERATURE RANGE For Specified Performance Min Y Grade Typ Max Min 20 W Grade Typ Max 5 5 5 3.5 5 5 3.5 +65 250 120 90 25°C TOPR TOPR 2 +65 kΩ MΩ kΩ V mV dB dB Common-mode voltage > 5 V Common-mode voltage < 5 V Common-mode continuous Differential input voltage TOPR, f = dc, VCM > 5 V, see Figure 5 TOPR, f = dc, VCM < 5 V, see Figure 5 −2 100 80 0.1 4.9 4.9 V V Ω 250 120 90 0.05 4.95 2 500 4.5 500 4.5 kHz V/µs 7 70 7 70 µV p-p nV/√Hz 4.5 1.2 5.5 2.0 76 −40 mV mV µV/°C ±1 ±2.5 ±2.2 5 0.05 4.95 2 VO ≥ 0.1 V dc TOPR TOPR 1 −13 ±1 0.1 V/V % % ppm/°C ±0.25 ±0.4 ±0.35 −13 100 80 Test Conditions/Comments 20 ±0.25 −2 Unit 4.5 1.2 5.5 2.0 V mA dB +125 °C 76 +125 −40 TOPR TOPR VCM > 5 V 3, see Figure 12 The mean of the gain drift distribution is typically −13 ppm/°C, with σ = 3 ppm/°C. The mean of the offset drift distribution is typically 5 µV/°C, with σ = 3 µV/°C. 3 When the input common-mode voltage is less than 5 V, the supply current increases, which can be calculated by IS = −0.275 (VCM) + 2.5. 1 2 Rev. C | Page 3 of 13 AD8211 Data Sheet ABSOLUTE MAXIMUM RATINGS ESD CAUTION Table 2. Parameter Supply Voltage Continuous Input Voltage Range Reverse Supply Voltage Differential Input Voltage ESD Rating Human Body Model (HBM) Charged Device Model (CDM) Operating Temperature Range Storage Temperature Range Rating 12.5 V −3 V to +68 V −0.3 V ±500 mV ±4000 V ±1000 V −40°C to +125°C −65°C to +150°C Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. Rev. C | Page 4 of 13 Data Sheet AD8211 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS OUT 1 5 V+ 4 VIN– 1 2 GND 2 5 VIN+ 3 TOP VIEW (Not to Scale) 3 4 06824-030 Figure 3. Pin Configuration Figure 2. Metallization Diagram Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 Mnemonic OUT GND VIN+ VIN− V+ X −277 −140 −228 +229 +264 Y +466 +466 −519 −519 +466 Description Buffered Output Ground Noninverting Input Inverting Input Supply Rev. C | Page 5 of 13 06824-002 AD8211 AD8211 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 40 35 1.0 0.8 0.6 GAIN (dB) VOSI (mV) 0.4 0.2 0 –0.2 –0.4 –0.6 06824-112 –0.8 –1.0 –1.2 –40 –20 0 20 40 60 80 100 120 30 25 20 15 10 5 0 –5 –10 –15 –20 –25 –30 –35 –40 10k 06824-107 1.2 100k TEMPERATURE (°C) Figure 4. Typical Offset (VOSI) vs. Temperature Figure 7. Typical Small Signal Bandwidth (VOUT = 200 mV p-p) 140 10 9 130 TOTAL OUTPUT ERROR (%) COMMON-MODE VOLTAGE > 5V 120 CMRR (dB) 10M 1M FREQUENCY (Hz) 110 100 COMMON-MODE VOLTAGE < 5V 90 80 8 7 6 5 4 3 06824-114 60 10 100 1k 10k 100k 06824-118 2 70 1 0 1M 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 250 FREQUNCY (Hz) DIFFERENTIAL INPUT VOLTAGE (mV) Figure 5. Typical CMRR vs. Frequency Figure 8. Total Output Error vs. Differential Input Voltage 2500 –510 2000 –515 –520 500 0 –500 –1000 –1500 –530 –535 VIN+ –540 –545 –550 –555 –560 –2000 –2500 –40 –525 –20 0 20 40 60 80 100 VIN– 06824-103 INPUT BIAS CURRENT (µA) 1000 06824-113 GAIN ERROR (PPM) 1500 –565 –570 120 0 TEMPERATURE (°C) 25 50 75 100 125 150 175 200 225 DIFFERENTIAL INPUT VOLTAGE (mV) Figure 6. Typical Gain Error vs. Temperature Figure 9. Input Bias Current vs. Differential Input Voltage, VCM = 0 V Rev. C | Page 6 of 13 250 Data Sheet AD8211 110 100mV/DIV 90 INPUT VIN+ 80 1V/DIV 70 VIN– 60 OUTPUT 06824-104 50 40 0 25 50 75 100 125 150 175 200 225 06824-110 INPUT BIAS CURRENT (µA) 100 250 TIME (500ns/DIV) DIFFERENTIAL INPUT VOLTAGE (mV) Figure 10. Input Bias Current vs. Differential Input Voltage, VCM = 5 V Figure 13. Fall Time 0.8 INPUT 0 100mV/DIV –0.4 OUTPUT –0.8 1V/DIV –1.2 –1.6 –2.4 –5 06824-102 –2.0 0 5 10 15 20 25 30 35 40 45 50 55 60 06824-111 INPUT BIAS CURRENT (mA) 0.4 65 TIME (500ns/DIV) INPUT COMMON-MODE VOLTAGE (V) Figure 11. Input Bias Current vs. Input Common-Mode Voltage Figure 14. Rise Time 4.0 200mV/DIV 3.0 INPUT 2.5 2V/DIV 2.0 1.5 OUTPUT –2 0 2 4 6 8 06824-109 1.0 –4 06824-101 SUPPLY CURRENT (mA) 3.5 65 TIME (1µs/DIV) COMMON-MODE VOLTAGE (V) Figure 12. Supply Current vs. Common-Mode Voltage Figure 15. Differential Overload Recovery (Falling) Rev. C | Page 7 of 13 AD8211 Data Sheet INPUT 200mV/DIV OUTPUT 06824-108 2V/DIV 11.5 11.0 10.5 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 06824-106 MAXIMUM OUTPUT SINK CURRENT (mA) 12.0 5.5 5.0 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 TIME (1µs/DIV) TEMPERATURE (°C) Figure 19. Maximum Output Sink Current vs. Temperature Figure 16. Differential Overload Recovery (Rising) 2V/DIV 06824-120 0.01/DIV 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 –40 TIME 5µs/DIV) 06824-105 MAXIMUM OUTPUT SOURCE CURRENT (mA) 9.0 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) Figure 20. Maximum Output Source Current vs. Temperature Figure 17. Settling Time (Falling) 5.0 2V/DIV 06824-119 0.01/DIV 4.2 3.8 3.4 3.0 2.6 2.2 1.8 06824-117 OUTPUT VOLTAGE RANGE (V) 4.6 1.4 1.0 TIME 5µs/DIV) 0 1 2 3 4 5 6 7 8 OUTPUT SOURCE CURRENT (mA) Figure 21. Output Voltage Range vs. Output Source Current Figure 18. Settling Time (Rising) Rev. C | Page 8 of 13 9 Data Sheet AD8211 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 06824-116 OUTPUT VOLTAGE RANGE FROM GND (V) 2.0 0.2 0 0 1 2 3 4 5 6 7 8 9 10 11 12 OUTPUT SINK CURRENT (mA) Figure 22. Output Voltage Range from GND vs. Output Sink Current Rev. C | Page 9 of 13 AD8211 Data Sheet THEORY OF OPERATION In typical applications, the AD8211 amplifies a small differential input voltage generated by the load current flowing through a shunt resistor. The AD8211 rejects high common-mode voltages (up to 65 V) and provides a ground referenced, buffered output that interfaces with an analog-to-digital converter (ADC). Figure 23 shows a simplified schematic of the AD8211. A load current flowing through the external shunt resistor produces a voltage at the input terminals of the AD8211. The input terminals connect to Amplifier A1 by Resistor R and Resistor R1. The inverting terminal, which has very high input impedance, is held to the following because negligible current flows through Resistor R: (VCM) − (ISHUNT × RSHUNT) ISHUNT Amplifier A1 forces the noninverting input to the same potential. Therefore, the current that flows through Resistor R1 is equal to RSHUNT IIN R1 R IIN = (ISHUNT × RSHUNT)/R1 V+ A1 PROPRIETARY OFFSET CIRCUITRY Q1 This current (IIN) is converted back to a voltage via ROUT. The output buffer amplifier has a gain of 20 V/V and offers excellent accuracy because the internal gain setting resistors are precision trimmed to within 0.01% matching. The resulting output voltage is equal to VOUT = (ISHUNT × RSHUNT ) × 20 VOUT = (ISHUNT × RSHUNT) × 20 AD8211 GND 06824-022 G = +20 ROUT Figure 23. Simplified Schematic Rev. C | Page 10 of 13 Data Sheet AD8211 APPLICATION NOTES OUTPUT LINEARITY In all current sensing applications, and especially in automotive and industrial environments where the common-mode voltage can vary significantly, it is important that the current sensor maintain the specified output linearity, regardless of the input differential or common-mode voltage. The AD8211 contains specific circuitry on the input stage, which ensures that even when the differential input voltage is very small, and the common-mode voltage is also low (below the 5 V supply), the input-to-output linearity is maintained. Figure 24 shows the input differential voltage vs. the corresponding output voltage at different common modes. Regardless of the common mode voltage, the AD8211 provides a correct output voltage when the input differential is at least 2 mV, which is due to the voltage range of the output amplifier that can go as low as 33 mV typical. The specified minimum output amplifier voltage is 100 mV to provide sufficient guard bands. The ability of the AD8211 to work with very small differential inputs, regardless of the common-mode voltage, allows for additional dynamic range, accuracy, and flexibility in any current sensing application. 200 180 140 120 100 80 60 40 IDEAL VOUT (mV) VOUT (mV) @ VCM = 0V VOUT (mV) @ VCM = 65V 20 06824-115 OUTPUT VOLTAGE (mV) 160 0 0 1 2 3 4 5 6 7 8 9 10 DIFFERENTIAL INPUT VOLTAGE (mV) Figure 24. Gain Linearity Due to Differential and Common-Mode Voltage Rev. C | Page 11 of 13 AD8211 Data Sheet APPLICATIONS INFORMATION OVERCURRENT DETECTION (