AD8213WYRMZ

Dual, High Voltage, Current Shunt Monitor AD8213 Data Sheet FUNCTIONAL BLOCK DIAGRAM –IN2 ±4000 V human body model (HBM) ESD High common-mode input voltage range −2 V to +65 V operating −3 V to +68 V survival Buffered output voltage Wide operating temperature range −40°C to +125°C for Y grade −40°C to +150°C for H grade Excellent ac and dc performance −10 ppm/°C typical gain drift 120 dB typical CMRR at dc Qualified for automotive applications +IN2 +IN1 A2 –IN1 A1 PROPRIETARY OFFSET CIRCUITRY V+ PROPRIETARY OFFSET CIRCUITRY OUT2 OUT1 G = +20 G = +20 AD8213 CF2 APPLICATIONS GND CF1 06639-001 FEATURES Figure 1. High-side current sensing Motor controls Transmission controls Diesel injection controls Engine management Suspension controls Vehicle dynamic controls DC to DC converters GENERAL DESCRIPTION The AD8213 is a dual-channel, precision current sense amplifier. It features a set gain of 20 V/V, with a maximum ±0.5% gain error over the entire temperature range. The buffered output voltage directly interfaces with any typical converter. Excellent common-mode rejection from −2 V to +65 V, is independent of the 5 V supply. The AD8213 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. D 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 AD8213 also features additional pins that allow the user to low-pass filter the input signal before amplifying, via an external capacitor to ground. The AD8213 has an operating temperature range of −40°C to +125°C for the Y grade, −40°C to +150°C for the H grade and is offered in a small 10-lead MSOP 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 AD8213 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1  Output Linearity ......................................................................... 11  Applications ....................................................................................... 1  Low-Pass Filtering ...................................................................... 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  Bidirectional Current Sensing .................................................. 13  ESD Caution .................................................................................. 4  Outline Dimensions ....................................................................... 14  Pin Configuration and Function Descriptions ............................. 5  Ordering Guide .......................................................................... 14  Typical Performance Characteristics ............................................. 6  Automotive Products ................................................................. 14  Theory of Operation ...................................................................... 10  Application Notes ........................................................................... 11  REVISION HISTORY 12/2016—Rev. C to Rev. D Changes to Features Section............................................................ 1 Changes to Table 1 ............................................................................ 3 Changes to Figure 30 ...................................................................... 12 Change to Ordering Guide ............................................................ 14 Add Automotive Products Section ............................................... 14 10/2013—Rev. B to Rev. C Changed Offset Voltage (RTI) Parameter from ±1 mV Maximum to ±1 mV Typical, Table 1 ............................................ 3 4/2013—Rev. A to Rev. B Added H Grade (Throughout) ....................................................... 1 Changes to Table 1 ............................................................................ 3 Added AD8213WH Temperature Range, Table 2 ........................ 4 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 14 5/2009—Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 14 5/2007—Revision 0: Initial Version Rev. D | Page 2 of 14 Data Sheet AD8213 SPECIFICATIONS TOPR = operating temperature range, 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 FILTER RESISTOR 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 1 Test Conditions/Comments Min Typ Max Unit ±0.5 −25 V/V % % ppm/°C ±2.2 ±12 mV mV µV/°C 20 ±0.25 Output voltage (VO) ≥ 0.1 V dc TOPR 0 25°C TOPR TOPR −10 ±1 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) AD8213Y, AD8213WY AD8213WH AD8213Y, AD8213WY AD8213WH CF access to resistor for low-pass filter 5 5 3.5 −2 100 80 0.1 0.15 COUT = 20 pF, no filter capacitor (CF) Output capacitance (COUT) = 20 pF, CF = 20 pF 0.05 2 20 76 74 AD8213Y, AD8213WY AD8213WH −40 −40 kHz V/µs V/µs 7 70 µV p-p nV/√Hz 2.5 When the common-mode input is less than 5 V, the supply current increases, which can be calculated by IS = −0.52 × (VCM) + 4.9 (see Figure 11). Rev. D | Page 3 of 14 22 500 4.5 2.7 4.5 VCM > 5 V, per amplifier 1, total supply current for two channels AD8213Y, AD8213WY AD8213WH AD8213Y, AD8213WY AD8213WH 4.9 4.88 V V V V Ω kΩ 250 120 90 4.95 18 +65 kΩ MΩ kΩ V mV dB dB 5.5 V 3.75 4.5 mA mA dB dB +125 +150 °C °C AD8213 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Continuous Input Voltage (Survival) Reverse Supply Voltage ESD Rating HBM Charged Device Model (CDM) Operating Temperature Range AD8213Y, AD8213WY AD8213WH Storage Temperature Range Output Short-Circuit Duration Rating 12.5 V −3 V to +68 V −0.3 V ±4000 V ±1000 V 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. ESD CAUTION −40°C to +125°C −40°C to +150°C −65°C to +150°C Indefinite Rev. D | Page 4 of 14 Data Sheet AD8213 1 10 2 9 3 8 4 7 –IN2 1 10 –IN1 +IN2 2 AD8213 9 +IN1 TOP VIEW (Not to Scale) 8 V+ 7 OUT1 6 CF1 GND 3 OUT2 4 06639-002 6 5 CF2 5 Figure 2. Metallization Diagram Figure 3. Pin Configuration Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 Mnemonic −IN2 +IN2 GND OUT2 CF2 CF1 OUT1 V+ +IN1 −IN1 X −401 −401 −401 −394 −448 +448 +394 +401 +401 +401 Y +677 +510 −53 −500 −768 −768 −500 −61 +510 +677 Description Inverting Input of the Second Channel. Noninverting Input of the Second Channel. Ground. Output of the Second Channel. Low-Pass Filter Pin for the Second Channel. Low-Pass Filter Pin for the First Channel. Output of the First Channel. Supply. Noninverting Input of the First Channel. Inverting Input of the First Channel. Rev. D | Page 5 of 14 06639-003 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS AD8213 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 0.8 0.7 40 35 30 25 20 0 –0.1 –0.2 –0.3 –0.4 –0.5 –0.6 –0.7 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) –40 10k 06639-104 –0.8 –40 10M Figure 7. Typical Small Signal Bandwidth, VOUT = 200 mV p-p 10 COMMON-MODE VOLTAGE > 5V 110 100 90 COMMON-MODE VOLTAGE < 5V 80 70 60 100 1k 10k 100k 1M FREQUENCY (Hz) 8 7 6 5 4 3 2 1 0 –1 06639-005 50 10 9 DIFFERENTIAL INPUT VOLTAGE (mV) Figure 5. CMRR vs. Frequency Figure 8. Total Output Error vs. Differential Input Voltage 2500 –475 2000 –480 –485 INPUT BIAS CURRENT (nA) 1500 1000 500 0 –500 –1000 –1500 –490 –495 –500 +IN –505 –510 –515 –520 –525 –2000 –IN –530 –20 0 20 40 60 TEMPERATURE (°C) 80 100 120 06639-102 –2500 –40 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 250 –535 0 25 50 75 100 125 150 175 200 225 250 DIFFERENTIAL INPUT VOLTAGE (mV) Figure 9. Input Bias Current vs. Differential Input Voltage, VCM = 0 V, Per Channel Figure 6. Typical Gain Drift Rev. D | Page 6 of 14 06639-010 120 06639-013 OUTPUT ERROR (%) (% ERROR OF THE IDEAL OUTPUT VALUE) 130 CMRR (dB) 1M FREQUENCY (Hz) Figure 4. Typical Offset Drift (VOSI) GAIN ERROR (ppm) 100k 06639-008 15 10 5 0 –5 –10 –15 –20 –25 –30 –35 GAIN (dB) VOSI (mV) 0.6 0.5 0.4 0.3 0.2 0.1 Data Sheet AD8213 0.2 INPUT 100mV/DIV –0.2 OUTPUT –0.4 –0.6 OUTPUT 1V/DIV, CF = 20pF –0.8 1V/DIV, CF = 100pF –1.2 –5 5 15 25 35 45 55 65 INPUT COMMON-MODE VOLTAGE (V) 06639-011 –1.0 06639-015 INPUT BIAS CURRENT (mA) 0 TIME (2µs/DIV) Figure 10. Input Bias Current vs. Input Common-Mode Voltage Per Input Figure 13. Rise Time 7.0 6.5 200mV/DIV 5.5 5.0 INPUT 4.5 4.0 3.5 2V/DIV, CF = 20pF 3.0 2.5 2.0 OUTPUT –2 0 2 4 6 8 65 COMMON-MODE VOLTAGE (V) Figure 11. Supply Current vs. Common-Mode Voltage 06639-016 1.0 –4 06639-012 1.5 TIME (1µs/DIV) Figure 14. Differential Overload Recovery (Falling) 100mV/DIV INPUT INPUT 200mV/DIV 1V/DIV, CF = 20pF OUTPUT OUTPUT OUTPUT TIME (2µs/DIV) 2V/DIV, CF = 20pF TIME (1µs/DIV) Figure 12. Fall Time Figure 15. Differential Overload Recovery (Rising) Rev. D | Page 7 of 14 06639-017 1V/DIV, CF = 100pF 06639-014 SUPPLY CURRENT (mA) 6.0 AD8213 Data Sheet 0.01/DIV 10 9 8 7 6 5 4 3 2 1 0 –40 06639-105 TIME (5µs/DIV) 11 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) Figure 16. Settling Time (Falling) 06639-021 MAXIMUM OUTPUT SOURCE CURRENT (mA) 12 2V/DIV Figure 19. Maximum Output Source Current vs. Temperature Per Channel 5.0 4.9 OUTPUT VOLTAGE RANGE (V) 4.8 2V/DIV 0.01/DIV 4.7 4.6 4.5 4.4 4.3 4.2 4.1 4.0 3.9 3.8 3.7 06639-106 3.5 TIME (5µs/DIV) Figure 20. Output Voltage Range vs. Output Source Current Per Channel 12 2.0 10 9 8 7 6 5 4 3 2 1 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 6 7 OUTPUT SINK CURRENT (mA) Figure 18. Maximum Output Sink Current vs. Temperature Per Channel 8 9 10 06639-024 OUTPUT VOLTAGE RANGE FROM GND (V) 11 06639-020 MAXIMUM OUTPUT SINK CURRENT (mA) 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 OUTPUT SOURCE CURRENT (mA) Figure 17. Settling Time (Rising) 0 –40 0 06639-023 3.6 Figure 21. Output Voltage Range from GND vs. Output Sink Current Per Channel Rev. D | Page 8 of 14 Data Sheet AD8213 2100 TEMP = –40°C TEMP = +25°C TEMP = +125°C 1000 1800 1500 600 COUNT COUNT 800 400 1200 900 600 200 –10 –5 0 5 10 15 VOS (µV/°C) 0 –2.0 06639-006 0 –15 1200 COUNT 1000 800 600 400 –18 –15 –12 –9 GAIN DRIFT (ppm/°C) –6 –3 0 06639-101 200 –21 –0.5 0 0.5 1.0 1.5 Figure 24. Offset Distribution (VOS), VCM = 6 V 1400 –24 –1.0 VOS (mV) Figure 22. Offset Drift Distribution (VOS), Temperature Range = −40°C to +125°C 0 –1.5 Figure 23. Gain Drift Distribution, Temperature Range = −40°C to +125°C Rev. D | Page 9 of 14 2.0 06639-103 300 AD8213 Data Sheet THEORY OF OPERATION In typical applications, the AD8213 amplifies a small differential input voltage generated by the load current flowing through a shunt resistor. The AD8213 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 25 shows a simplified schematic of the AD8213. This current (IIN1) is converted back to a voltage via ROUT1. The output buffer amplifier has a gain of 20 V/V, and offers excellent accuracy as the internal gain setting resistors are precision trimmed to within 0.01% matching. The resulting output voltage is equal to The following explanation refers exclusively to Channel 1 of the AD8213; however, the same explanation applies to Channel 2. Prior to the buffer amplifier, a precision trimmed, 20 kΩ resistor can perform the low-pass filtering of the input signal prior to the amplification stage. By using this resistor, the noise of the input signal does not amplify but is rejected, resulting in a more precise output signal that directly interfaces with a converter. A capacitor from the CF1 pin to GND, results in a low-pass filter with a corner frequency of VOUT1 = (ISHUNT1 × RSHUNT1) × 20 A load current flowing through the external shunt resistor produces a voltage at the input terminals of the AD8213. The input terminals are connected to Amplifier A1 by Resistor R1 (1) and Resistor R1 (2). The inverting terminal, which has very high input impedance is held to (VCM) − (ISHUNT × RSHUNT), because negligible current flows through Resistor R1 (2). Amplifier A1 forces the noninverting input to the same potential. Therefore, the current that flows through Resistor R1 (1), is equal to f 3dB  1 220000 C FILTER IIN1 = (ISHUNT1 × RSHUNT1)/R1 (1) ISHUNT2 ISHUNT1 RSHUNT2 RSHUNT1 IIN1 R2 (2) R2 (1) R1 (1) A2 A1 PROPRIETARY OFFSET CIRCUITRY Q2 20kΩ OUT1 = (ISHUNT1 × RSHUNT1 ) × 20 ROUT1 ROUT2 G = +20 V+ PROPRIETARY OFFSET CIRCUITRY Q1 20kΩ OUT2 = (ISHUNT2 × RSHUNT2 ) × 20 R1 (2) G = +20 AD8213 CF2 GND CF1 Figure 25. Simplified Schematic Rev. D | Page 10 of 14 06639-028 IIN2 Data Sheet AD8213 APPLICATION NOTES OUTPUT LINEARITY LOW-PASS FILTERING 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 AD8213 contains specific circuitry on the input stage, which ensures that even when the differential input voltage is very small, and the commonmode voltage is also low (below the 5 V supply), the input to output linearity is maintained. Figure 26 displays the input differential voltage vs. the corresponding output voltage at different common modes. In typical applications, such as motor and solenoid current sensing, filtering the differential input signal of the AD8213 can be beneficial in reducing differential common-mode noise as well as transients and current ripples flowing through the input shunt resistor. Typically, such a filter can be implemented by adding a resistor in series with each input and a capacitor directly between the input pins. However, the AD8213 features a filter pin available after the input stage but before the final amplification stage. The user can connect a capacitor to ground, making a low-pass filter with the internal precision trimmed, 20 kΩ resistor. Connecting this capacitor to ground, results in no gain or CMRR errors. Figure 27 shows the typical connection. 220 200 ISHUNT2 ISHUNT1 180 RSHUNT2 RSHUNT1 160 R2 (1) VOUT (mV) 140 R2 (2) R1 (1) R1 (2) 120 A2 VOUT @ VCM = 65V 100 VOUT @ VCM = 0V 80 A1 PROPRIETARY OFFSET CIRCUITRY 60 40 V+ PROPRIETARY OFFSET CIRCUITRY 20kΩ 20kΩ 20 IDEAL VOUT 1 2 3 4 5 6 7 VIN DIFFERENTIAL (mV) 8 9 10 G = +20 AD8213 CF2 Figure 26. Gain Linearity due to Differential and Common-Mode Voltage GND CAP2 The AD8213 provides a correct output voltage, regardless of the common mode, 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 in order to provide sufficient guard bands. The ability of the AD8213 to work with very small differential inputs regardless of the common-mode voltage, allows more dynamic range, accuracy, and flexibility in any current sensing application. CF1 CAP1 06639-030 0 G = +20 06639-029 0 Figure 27. Filter Capacitor Connections Use the following formula to calculate the 3 dB frequency of this low-pass filter: f 3dB  1 220000 C FILTER It is recommended to always place a capacitor from the filter pin to GND to prevent the output chatter due to noise potentially entering through the filter pin and coupling to the output. This capacitor can be a ≈20 pF capacitor in cases when all of the bandwidth of the AD8213 is needed in the application. Rev. D | Page 11 of 14 AD8213 Data Sheet APPLICATIONS INFORMATION OVERCURRENT DETECTION (