High Bandwidth, Bidirectional 65 V Difference Amplifier AD8216 ±4000 V HBM ESD Ideal for current shunt applications High common-mode voltage range −4 V to +65 V operating −40 V to +80 V survival 3 MHz bandwidth <100 ns output propagation delay Gain: 3 V/V Wide operating temperature range Die: −40°C to +150°C 8-lead SOIC: −40°C to +125°C Adjustable output offset Available in 8-lead SOIC Excellent ac and dc performance 10 μV/°C offset drift 10 ppm/°C gain drift FUNCTIONAL BLOCK DIAGRAM V+ 6 +IN 8 5 OUT 7 VREF 1 3 VREF 2 –IN 1 AD8216 NC 4 2 NC = NO CONNECT GND 07062-001 FEATURES Figure 1. APPLICATIONS High-side current sensing in DC-to-dc converters Motor controls Transmission controls Diesel-injection controls Engine management Suspension controls Vehicle dynamic controls GENERAL DESCRIPTION The AD8216 is a single-supply, difference amplifier ideal for amplifying small differential voltages in the presence of large common-mode voltages. The operating input common-mode voltage range extends from −4 V to +65 V. The typical supply voltage is 5 V. The AD8216 features a 3 MHz bandwidth, allowing for the input-to-output propagation delay that is always less than 150 ns. This feature is ideal for applications monitoring rapidly increasing and decreasing load currents. The AD8216 is offered in a SOIC package. The operating temperature range is −40°C to +125°C. Excellent ac and dc performance over temperature keep errors in the measurement loop to a minimum. Offset and gain drift are guaranteed to a maximum of 20 μV/°C and 15 ppm/°C, respectively. The output offset can be adjusted from 0.06 V to 4.9 V with a 5 V supply by using the VREF1 pin and the VREF2 pin. With the VREF1 pin attached to the V+ pin and the VREF2 pin attached to the GND pin, the output is set at half scale. Attaching both VREF1 and VREF2 to GND causes the output to be unipolar, starting near ground. Attaching both VREF1 and VREF2 to V+ causes the output to be unipolar, starting near V+. Other offsets can be obtained by applying an external voltage to VREF1 and VREF2. 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 ©2007 Analog Devices, Inc. All rights reserved. AD8216 TABLE OF CONTENTS Features .............................................................................................. 1 Ground Referenced Output ...................................................... 11 Applications....................................................................................... 1 V+ Referenced Output .............................................................. 11 Functional Block Diagram .............................................................. 1 Bidirectional Operation............................................................. 11 General Description ......................................................................... 1 External ReferenceD Output .................................................... 12 Revision History ............................................................................... 2 Splitting the Supply .................................................................... 12 Specifications..................................................................................... 3 Splitting an External Reference ................................................ 12 Absolute Maximum Ratings............................................................ 4 Applications Information .............................................................. 13 ESD Caution.................................................................................. 4 High-Side Current Sense with a Low-Side Switch................. 13 Pin Configuration and Function Descriptions............................. 5 High-Side Current Sense with a High-Side Switch ............... 13 Typical Performance Characteristics ............................................. 6 Outline Dimensions ....................................................................... 14 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 14 Output Offset Adjustment............................................................. 11 Unidirectional Operation.......................................................... 11 REVISION HISTORY 11/07—Revision 0: Initial Version Rev. 0 | Page 2 of 16 AD8216 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 OUTPUT Output Voltage Range Output Resistance DYNAMIC RESPONSE Small Signal −3 dB Bandwidth Slew Rate Propagation Delay NOISE 0.1 Hz to 10 Hz, RTI Spectral Density, 1 kHz, RTI OFFSET ADJUSTMENT Ratiometric Accuracy 2 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 Conditions Min Typ Max Unit ±0.25 ±0.4 15 V/V % % ppm/°C ±3 ±20 mV mV μV/°C 3 VOUT ≥ 0.1 V dc, 25°C Specified temperature range 10 25°C Specified temperature range ±0.5 ±10 400 200 Common mode, continuous Differential, VREF1 and VREF2 tied to GND Differential, VREF1 @ GND and VREF2 @ 5 V 25°C, f = dc to 20 kHz 1 Operating temperature range, f = dc to 20 kHz1 −4 −800 80 80 RL = 25 kΩ 0.06 +65 1.6 Input-to-output response +800 90 90 4.9 200 V Ω 3 15 100 MHz V/μs ns 150 20 0.5 Divider to supplies Voltage applied to VREF1 and VREF2 in parallel VS = 5 V 0.499 0.06 0.0 24 μV p-p μV/√Hz 32 0.501 ±0.5 4.9 VS 40 V/V mV/V V V kΩ 1 5.5 2 V mA dB +125 °C 4.5 VOUT = 0.1 V dc 70 Operating temperature range Source imbalance < 2 Ω. The offset adjustment is ratiometric to the power supply when VREF1 and VREF2 are used as a divider between the supplies. Rev. 0 | Page 3 of 16 −40 kΩ kΩ V V mV dB dB AD8216 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage Continuous Input Common-Mode Voltage Continuous Input Differential Voltage Reverse Supply Voltage ESD Rating HBM (Human Body Model) CDM (Charged Device Model) Operating Temperature Range Storage Temperature Range Output Short-Circuit Duration ESD CAUTION Rating 12.5 V −40 V to +80 V 6V 0.3 V ±4000 V ±1000 V −40°C to +125°C −65°C to +150°C Indefinite Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Rev. 0 | Page 4 of 16 AD8216 1 –IN 1 8 GND 2 VREF 2 3 NC 4 7 AD8216 TOP VIEW (Not to Scale) 8 +IN 7 VREF 1 6 V+ 5 OUT 2 NC = NO CONNECT 6 5 Figure 3. Pin Configuration 07062-002 3 07062-003 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Figure 2. Metallization Diagram Table 3. Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 Mnemonic −IN GND VREF2 NC OUT V+ VREF1 +IN X −320 −357 −349 NC +348 +349 +349 +318 Y +390 +14 −201 NC −325 −194 −26 +390 Die size is 1100 μm by 1035 μm. Die thickness is 13 mil. Minimum passivation opening (minimum bond pad size) is 92 μm × 92 μm. Passivation type is 8 kA USG (Oxide) + 10 kA Oxynitride. Bond pad metal composition is 98.5% Al, 1% Si, and 0.5% Cu. Backside potential is V+. Rev. 0 | Page 5 of 16 AD8216 500 400 300 100 GAIN (dB) VOSI (µV) 200 0 –100 –200 –300 –500 –40 –20 0 20 40 60 80 100 120 TEMPERATURE (°C) 07062-016 –400 20 15 10 5 0 –5 –10 –15 –20 –25 –30 –35 –40 –45 –50 –55 –60 1k 10k 100k 07062-015 TYPICAL PERFORMANCE CHARACTERISTICS 1M FREQUENCY (Hz) Figure 4. Typical Offset Drift Figure 7. Typical Small Signal Bandwidth (VOUT = 200 mV p-p) 120 110 INPUT (200mV/DIV) 100 90 CMRR (dB) 80 70 60 OUTPUT (500mV/DIV) 50 40 30 20 100 1k 10k 100k 1M 10M 100M FREQUENCY (Hz) Figure 5. CMRR vs. Frequency TIME (200ns/DIV) 07062-011 0 10 07062-021 10 Figure 8. Rise Time 1500 1300 1100 900 500 INPUT (200mV/DIV) 300 100 –100 –300 –500 –700 –900 OUTPUT (500mV/DIV) –1100 –1500 –40 –20 0 20 40 60 TEMPERATURE (°C) 80 100 120 TIME (200ns/DIV) Figure 6. Typical Gain Drift Figure 9. Fall Time Rev. 0 | Page 6 of 16 07062-010 –1300 07062-017 GAIN ERROR (ppm) 700 INPUT (1V/DIV) OUTPUT (2V/DIV) 8 6 4 2 0 –40 07062-008 TIME (500ns/DIV) 10 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 07062-019 MAXIMUM OUTPUT SOURCE CURRENT (mA) AD8216 Figure 13. Maximum Output Source Current vs. Temperature Figure 10. Differential Overload Recovery (Falling) OUTPUT VOLTAGE RANGE (V) 5.0 INPUT (1V/DIV) 3.5 3.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT SOURCE CURRENT (mA) 07062-007 2.0 07062-009 TIME (500ns/DIV) Figure 14. Output Voltage Range vs. Output Source Current Figure 11. Differential Overload Recovery (Rising) 2.5 7 6 5 4 3 2 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 1.5 1.0 0.5 0 07062-020 1 2.0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 OUTPUT SINK CURRENT (mA) Figure 15. Output Voltage Range from GND vs. Output Sink Current Figure 12. Maximum Output Sink Current vs. Temperature Rev. 0 | Page 7 of 16 07062-006 OUTPUT VOLTAGE RANGE FROM GND (V) 8 MAXIMUM OUTPUT SINK CURRENT (mA) 4.0 2.5 OUTPUT (2V/DIV) 0 –40 4.5 AD8216 700 PROPAGATION DELAY 85ns 500 400 INPUT (50mV/DIV) ZERO CROSSING 300 200 OUTPUT (50mV/DIV) 100 0 5 10 15 20 25 30 35 40 45 50 55 60 65 INPUT COMMON-MODE VOLTAGE (V) AX AY 07062-014 0 BY TIME (50ns/DIV) Figure 16. Total Input Bias Current vs. Input Common-Mode Voltage 07062-013 TOTAL INPUT BIAS CURRENT (µA) BX 600 Figure 19. Propagation Delay (Falling) 7 AX OUTPUT ERROR (%) 6 PROPAGATION DELAY 110ns 5 4 INPUT (50mV/DIV) 3 ZERO CROSSING 2 1 07062-018 0 0.01 0.04 0.07 0.10 0.13 0.16 0.19 0.22 0.25 0.28 0.31 0.34 0.37 1.60 DIFFERENTIAL INPUT (V) BX BY TIME (50ns/DIV) Figure 17. Output Error (%) vs. Differential Input Voltage (Unidirectional Operation (VREF1 and VREF2 Connected to GND)) 07062-012 OUTPUT (50mV/DIV) AY Figure 20. Propagation Delay (Rising) 1.0 8000 0.6 0.4 6000 COUNT 0.2 0 4000 –0.2 –0.4 –0.8 –1.0 –1.0 –0.8 –0.6 –0.4 –0.2 0 0.2 0.4 0.6 0.8 0 –15 1.0 07062-037 2000 –0.6 07062-039 TOTAL OUTPUT ERROR (%) 0.8 –10 –5 OFFSET DRIFT (ppm/°C) INPUT DIFFERENTIAL VOLTAGE (V) Figure 21. Gain Drift Distribution Figure 18. Output Error (%) vs. Differential Input Voltage (Bidirectional Operation (VREF1 and VREF2 Connected to 2.5 V)) Rev. 0 | Page 8 of 16 0 5 AD8216 800 700 500 400 300 200 07062-038 COUNT 600 100 0 –20 –10 0 10 20 OFFSET DRIFT (µV/°C) Figure 22. Offset Drift Distribution Rev. 0 | Page 9 of 16 AD8216 THEORY OF OPERATION The AD8216 is a single-supply difference amplifier typically used to accurately amplify a small differential current shunt voltage in the presence of a rapidly changing common-mode voltage. The AD8216 consists of an amplifier (A1), a resistor network, a small voltage reference, and a bias circuit (not shown), see Figure 23. The reference inputs, VREF1 and VREF2, are tied through resistors to the positive input of A1, which allows the output offset to be adjusted anywhere in the output operating range. The gain is 1 V/V from the reference pins to the output when the reference pins are used in parallel. When they are used to divide the supply, the gain is 0.5 V/V. The ratios of RA, RB, RC, and RF are trimmed to a high level of precision to allow the CMRR to exceed 80 dB. This performance is accomplished by laser trimming the resistor ratio matching to better than 0.01%. B B The input resistor network also attenuates normal (differential) mode voltages. Therefore, Amplifier A1 features a gain of 54 V/V to provide a total system gain of 3V/V. Total Gain (V/V) = 1/18 (V/V) × 54 (V/V) = 3 V/V –IN RA +IN RA A1 RB RB VOUT RF VREF1 RREF RC RREF RC VREF2 250mV AD8216 GND Figure 23. Simplified Schematic Rev. 0 | Page 10 of 16 07062-028 The set of input attenuators preceding A1 consist of RA, RB, and RC, which feature a combined series resistance of approximately 200 kΩ ± 20%. The purpose of these resistors is to attenuate the input voltage to match the input voltage range of A1. This balanced resistor network attenuates the common-mode signal by a ratio of 1/18. A1 amplifier inputs are held within the power supply range, even if Pin 1 and Pin 8 exceed the supply or fall below common (ground). A reference voltage of 250 mV biases the attenuator above ground, which allows the amplifier to operate in the presence of negative common-mode voltages. AD8216 OUTPUT OFFSET ADJUSTMENT The output of the AD8216 can be adjusted for unidirectional or bidirectional operation. UNIDIRECTIONAL OPERATION Unidirectional operation allows the AD8216 to measure currents through a resistive shunt in one direction. The basic modes for unidirectional operation are ground referenced output mode and V+ referenced output mode. V+ REFERENCED OUTPUT The V+ referenced output mode is set when both reference pins are tied to the positive supply. It is typically used when the diagnostic scheme requires detection of the amplifier and the wiring before power is applied to the load (see Figure 25). V+ +IN For unidirectional operation, the output can be set at the negative rail (near ground) or at the positive rail (near V+) when the differential input is 0 V. The output moves to the opposite rail when a correct polarity differential input voltage is applied. In this case, full scale is approximately 1.6 V. The required polarity of the differential input depends on the output voltage setting. If the output is set at the positive rail, the input polarity needs to be negative to move the output down. If the output is set at ground, the polarity is positive to move the output up. OUT –IN VREF 1 AD8216 NC VREF 2 GND 07062-030 NC = NO CONNECT GROUND REFERENCED OUTPUT When using the AD8216 in this mode, both referenced inputs are tied to ground, which causes the output to sit at the negative rail when there are zero differential volts at the input (see Figure 24). Figure 25. V+ Referenced Output Table 5. V+ = 5 V VIN (Referred to −IN) 0V −1.6 V VOUT 4.9 V 0.1 V V+ +IN BIDIRECTIONAL OPERATION OUT –IN Bidirectional operation allows the AD8216 to measure currents through a resistive shunt in two directions. VREF 1 AD8216 NC In this case, the output is set anywhere within the output range. Typically, it is set at half scale for equal range in both directions. In some cases, however, it is set at a voltage other than half scale when the bidirectional current is nonsymmetrical. VREF 2 GND 07062-029 NC = NO CONNECT Figure 24. Ground Referenced Output Table 4. V+ = 5 V VIN (Referred to −IN) 0V 1.6 V VOUT 0.06 V 4.8 V Table 6. V+ = 5 V, VOUT = 2.5 V with VIN = 0 V VIN (Referred to −IN) +800 mV −800 mV VOUT 4.9 V 0.1V Adjusting the output is accomplished by applying voltage(s) to the referenced inputs. VREF1 and VREF2 are tied to internal resistors that connect to an internal offset node. There is no operational difference between the pins. Rev. 0 | Page 11 of 16 AD8216 EXTERNAL REFERENCED OUTPUT Tying both pins together and to a reference produces an output equal to the reference voltage when there is no differential input (see Figure 26). The output moves down from the reference voltage when the input is negative, relative to the −IN pin, and up when the input is positive, relative to the −IN pin. V+ +IN OUT –IN VREF 1 AD8216 V+ +IN NC OUT VREF 2 GND 07062-032 –IN NC = NO CONNECT VREF 1 AD8216 Figure 27. Split Supply 2.5V VOLTAGE REFERENCE SPLITTING AN EXTERNAL REFERENCE NC VREF 2 07062-031 GND NC = NO CONNECT In this case, an external reference is divided by 2 with an accuracy of approximately 0.5% by connecting one VREF pin to ground and the other VREF pin to the reference (see Figure 28). Figure 26. External Referenced Output V+ SPLITTING THE SUPPLY +IN By tying one reference pin to V+ and the other to the ground pin, the output is set at half of the supply when there is no differential input (see Figure 27). The benefit is that no external reference is required to offset the output for bidirectional current measurement. This configuration creates a midscale offset that is ratiometric to the supply, which means that if the supply increases or decreases, the output remains at half the supply. For example, if the supply is 5.0 V, the output is at half scale or 2.5 V. If the supply increases by 10% (to 5.5 V), the output goes to 2.75 V. –IN OUT VREF 1 AD8216 5V NC VREF 2 NC = NO CONNECT 07062-033 GND Figure 28. Split External Reference Rev. 0 | Page 12 of 16 VOLTAGE REFERENCE AD8216 APPLICATIONS INFORMATION A typical application for the AD8216 is high-side measurement of a current through a solenoid for PWM control of the solenoid opening. Typical applications include dc-to-dc converters, motor controls, and solenoid controls. Two typical circuit configurations are used for this type of application. When using a high-side switch, the battery voltage is connected to the load when the switch is closed, causing the commonmode voltage to increase to the battery voltage. In this case, when the switch is opened, the voltage reversal across the inductive load causes the common-mode voltage to be held one diode drop below ground by the clamp diode. 5V HIGH-SIDE CURRENT SENSE WITH A LOW-SIDE SWITCH SWITCH In this case, the PWM control switch is ground referenced. An inductive load (solenoid) is tied to a power supply. A resistive shunt is placed between the switch and the load (see Figure 29). An advantage of placing the shunt on the high side is that the entire current, including the recirculation current, can be measured because the shunt remains in the loop when the switch is off. In addition, diagnostics can be enhanced because shorts to ground can be detected with the shunt on the high side. 42V BATTERY +IN VREF 1 V+ OUT AD8216 SHUNT –IN GND VREF 2 NC CLAMP DIODE NC = NO CONNECT 07062-035 INDUCTIVE LOAD Figure 30. High-Side Switch In this circuit configuration, when the switch is closed, the common-mode voltage moves down to near the negative rail. When the switch is opened, the voltage reversal across the inductive load causes the common-mode voltage to be held one diode drop above the battery by the clamp diode. 5V CLAMP DIODE 42V BATTERY INDUCTIVE LOAD +IN VREF 1 V+ OUT The AD8216 measures current in both directions as the H-bridge switches and the motor changes direction. The output of the AD8216 is configured in an external reference bidirectional mode (see the Output Offset Adjustment section). AD8216 SHUNT –IN Another typical application for the AD8216 is as part of the control loop in H-bridge motor controls. In this case, the AD8216 is placed in the middle of the H-bridge so that it can accurately measure current in both directions by using the shunt available at the motor (see Figure 31). This is a better solution than a ground referenced op amp because ground is not typically a stable reference voltage in this type of application. This instability in the ground reference causes the measurements that could be made with a simple ground referenced op amp to be inaccurate. GND VREF 2 NC NC = NO CONNECT 07062-034 SWITCH CONTROLLER 5V Figure 29. Low-Side Switch MOTOR HIGH-SIDE CURRENT SENSE WITH A HIGH-SIDE SWITCH +IN VREF 1 V+ OUT AD8216 SHUNT –IN Rev. 0 | Page 13 of 16 GND VREF 2 NC 5V 2.5V NC = NO CONNECT Figure 31. Motor Control Application 07062-036 This configuration minimizes the possibility of unexpected solenoid activation and excessive corrosion (see Figure 30). In this case, both the switch and the shunt are on the high side. When the switch is off, it removes the battery from the load, which prevents damage from potential shorts to ground, while still allowing the recirculating current to be measured and providing for diagnostics. Removing the power supply from the load for the majority of the time minimizes the corrosive effects that could be caused by the differential voltage between the load and ground. AD8216 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 1 5 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 6.20 (0.2441) 5.80 (0.2284) 1.75 (0.0688) 1.35 (0.0532) 0.51 (0.0201) 0.31 (0.0122) 0.50 (0.0196) 0.25 (0.0099) 45° 8° 0° 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) COMPLIANT TO JEDEC STANDARDS MS-012-A A CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. 012407-A 8 4.00 (0.1574) 3.80 (0.1497) Figure 32. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model AD8216YRZ 1 AD8216YRZ-RL1 AD8216YRZ-R71 1 Temperature Range −40°C to +125°C −40°C to +125°C −40°C to +125°C Package Description 8-Lead SOIC_N 8-Lead SOIC_N, 13” Tape and Reel 8-Lead SOIC_N, 7” Tape and Reel Z = RoHS Compliant Part. Rev. 0 | Page 14 of 16 Package Option R-8 R-8 R-8 AD8216 NOTES Rev. 0 | Page 15 of 16 AD8216 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07062-0-11/07(0) T T Rev. 0 | Page 16 of 16