1 kV, Dual Channel Digital Isolators ADuM7240/ADuM7241 Data Sheet ADuM7240 VDD1 1 8 VDD2 VIA 2 ENCODE DECODE 7 VOA VIB 3 ENCODE DECODE 6 VOB 5 GND2 8 VDD2 GND1 4 10240-001 FUNCTIONAL BLOCK DIAGRAMS Narrow-body, RoHS-compliant, 8-lead SOIC Safety and regulatory approvals UL recognition UL 1577: 1000 V rms for 1 minute Low power operation 5 V operation 2.4 mA per channel maximum at 0 Mbps to 1 Mbps 11.8 mA per channel maximum at 25 Mbps 3.3 V operation 1.7 mA per channel maximum at 0 Mbps to 1 Mbps 8.2 mA per channel maximum at 25 Mbps Bidirectional communication Up to 25 Mbps data rate (NRZ) 3 V/5 V level translation High temperature operation: 105C High common-mode transient immunity: >15 kV/s Figure 1. ADuM7240 ADuM7241 VDD1 1 VOA 2 DECODE ENCODE 7 VIA VIB 3 ENCODE DECODE 6 VOB 5 GND2 GND1 4 10240-002 FEATURES Figure 2. ADuM7241 APPLICATIONS General-purpose multichannel isolation Data converter isolation Industrial field bus isolation GENERAL DESCRIPTION The ADuM7240/ADuM72411 are dual channel digital isolators based on the Analog Devices, Inc., iCoupler(R) technology. Combining high speed CMOS and monolithic air core transformer technologies, these isolation components provide outstanding performance characteristics superior to the alternatives, such as optocoupler devices and other integrated couplers. The ADuM7240/ADuM7241 dual 1 kV digital isolation devices are packaged in a narrow-body 8-lead SOIC. The ADuM7240/ ADuM7241 offer a cost-effective option compared to 2.5 kV or 5 kV isolators where only functional isolation is needed. Like other Analog Devices isolators, the ADuM7240/ADuM7241 offer very low power consumption, consuming one-tenth to one-sixth the power of comparable isolators at data rates up to 25 Mbps. Despite the low power consumption, all models of the 1 ADuM7240/ADuM7241 provide low pulse width distortion (<5 ns for C grade). In addition, every model has an input glitch filter to protect against extraneous noise disturbances. The ADuM7240/ADuM7241 provide two independent isolation channels and are available in two channel configurations with 1 Mbps or 25 Mbps data rates (see the Ordering Guide). All models operate with the supply voltage on either side ranging from 3.0 V to 5.5 V, providing compatibility with lower voltage systems as well as enabling voltage translation functionality across the isolation barrier. The ADuM7240/ADuM7241 also have an output default high logic state in the absence of input power. Protected by U.S. Patents 5,952,849; 6,873,065; and 7,075,329. Other patents pending. Rev. B 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 (c)2012-2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADuM7240/ADuM7241 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Absolute Maximum Ratings ............................................................8 Applications ....................................................................................... 1 ESD Caution...................................................................................8 Functional Block Diagrams ............................................................. 1 Pin Configurations and Function Descriptions ............................9 General Description ......................................................................... 1 Typical Performance Characteristics ........................................... 10 Revision History ............................................................................... 2 Applications Information .............................................................. 12 Specifications..................................................................................... 3 Printed Circuit Board Layout ................................................... 12 Electrical Characteristics--5 V Operation................................ 3 Propagation Delay-Related Parameters................................... 12 Electrical Characteristics--3.3 V Operation ............................ 4 DC Correctness .......................................................................... 12 Electrical Characteristics--Mixed 5 V/3.3 V Operation ........ 5 Magnetic Field Immunity.......................................................... 12 Electrical Characteristics--Mixed 3.3 V/5 V Operation ........ 6 Power Consumption .................................................................. 13 Package Characteristics ............................................................... 7 Insulation Lifetime ..................................................................... 13 Regulatory Information ............................................................... 7 Outline Dimensions ....................................................................... 14 Insulation and Safety-Related Specifications ............................ 7 Ordering Guide .......................................................................... 14 Recommended Operating Conditions ...................................... 7 REVISION HISTORY 10/15--Rev. A to Rev. B Change to Features Section ............................................................. 1 Changes to Table 14 .......................................................................... 7 5/12--Rev. 0 to Rev. A Changes to Table 2 ............................................................................ 3 Changed IDDI(Q) Maximum Parameter from 1.2 mA to 1.4 mA, Table 3, and IDDO(Q) Maximum Parameter from 0.95 mA to 1.1 mA, Table 3 ................................................................................. 3 Changes to Table 5 ............................................................................ 4 Changed IDDI(Q) Maximum Parameter from 0.83 mA to 1.0 mA, Table 6, and Changed IDDO(Q) Maximum Parameter from 0.68 mA to 0.8 mA, Table 6 ............................................................. 4 Changes to Table 8 ............................................................................ 5 Changed IDDI(Q) Maximum Parameter from 1.2 mA to 1.45 mA, Table 9, and Changed IDDO(Q) Maximum Parameter from 0.67 mA to 0.80 mA, Table 9 ........................................................... 5 Changes to Table 11 .......................................................................... 6 Changed IDDI(Q) Maximum Parameter from 0.83 mA to 1.0 mA, Table 12, and Changed IDDO(Q) Maximum Parameter from 0.90 mA to 1.1 mA, Table 12 ........................................................... 6 5/12--Revision 0: Initial Version Rev. B | Page 2 of 16 Data Sheet ADuM7240/ADuM7241 SPECIFICATIONS ELECTRICAL CHARACTERISTICS--5 V OPERATION All typical specifications are at TA = 25C, VDD1 = VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended operation range of 4.5 V VDD1 5.5 V, 4.5 V VDD2 5.5 V, and -40C TA +105C, unless otherwise noted. Switching specifications are tested with CL = 15 pF and CMOS signal levels, unless otherwise noted. Table 1. Parameter SWITCHING SPECIFICATIONS Pulse Width Data Rate Propagation Delay Pulse Width Distortion Change vs. Temperature Propagation Delay Skew1 Channel Matching Codirectional Opposing Direction Jitter 1 Symbol Min PW 250 A Grade Typ Max Min C Grade Typ Max 40 tPHL, tPLH PWD 1 75 25 50 10 5 tPSK 20 tPSKCD tPSKOD 25 30 32 41 2 3 25 50 5 10 2 2 2 2 4 6 Unit Test Conditions/Comments ns Mbps ns ns ps/C ns Within PWD limit Within PWD limit 50% input to 50% output |tPLH - tPHL| ns ns ns tPSK is the magnitude of the worst-case difference in tPHL or tPLH that is measured between units at the same operating temperature, supply voltages, and output load within the recommended operating conditions. Table 2. Parameter SUPPLY CURRENT ADuM7240 ADuM7241 Symbol Min 1 Mbps--A, C Grades Typ Max IDD1 IDD2 IDD1 IDD2 2.2 1.7 1.9 1.9 25 Mbps--C Grade Min Typ Max 2.8 2.2 2.4 2.4 16 3.9 9.3 8.2 21 5.7 13 12 Unit Test Conditions/Comments mA mA mA mA Table 3. For All Models Parameter DC SPECIFICATIONS Logic High Input Threshold Logic Low Input Threshold Logic High Output Voltages Symbol Min VIH VIL VOH 0.7 VDDx Logic Low Output Voltages VOL Input Current per Channel Supply Current per Channel Quiescent Input Supply Current Quiescent Output Supply Current Dynamic Input Supply Current Dynamic Output Supply Current AC SPECIFICATIONS Output Rise/Fall Time Common-Mode Transient Immunity1 Refresh Rate 1 II fr Max 0.3 VDDx VDDx - 0.1 VDDx - 0.4 -10 IDDI(Q) IDDO(Q) IDDI(D) IDDO(D) tR/tF |CM| Typ VDDx VDDx - 0.3 0.0 0.2 +0.01 1 0.8 0.29 0.03 15 0.1 0.4 +10 1.4 1.1 Unit Test Conditions/Comments V V V V V V A IOx = -20 A, VIx = VIxH IOx = -4 mA, VIx = VIxH IOx = 20 A, VIx = VIxL IOx = 4 mA, VIx = VIxL 0 V VIx VDDx mA mA mA/Mbps mA/Mbps 2.0 25 ns kV/s 600 kHz 10% to 90% VIx = VDDx, VCM = 1000 V, transient magnitude = 800 V DC data inputs |CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. Rev. B | Page 3 of 16 ADuM7240/ADuM7241 Data Sheet ELECTRICAL CHARACTERISTICS--3.3 V OPERATION All typical specifications are at TA = 25C, VDD1 = VDD2 = 3.3 V. Minimum/maximum specifications apply over the entire recommended operation range of 3.0 V VDD1 3.6 V, 3.0 V VDD2 3.6 V, and -40C TA +105C, unless otherwise noted. Switching specifications are tested with CL = 15 pF and CMOS signal levels, unless otherwise noted. Table 4. Parameter SWITCHING SPECIFICATIONS Pulse Width Data Rate Propagation Delay Pulse Width Distortion Change vs. Temperature Propagation Delay Skew1 Channel Matching Codirectional Opposing Direction Jitter 1 Symbol Min PW 250 tPHL, tPLH PWD A Grade Typ Max C Grade Typ Max Min 40 1 85 25 60 10 5 tPSK 20 tPSKCD tPSKOD 25 30 37 50 2 3 25 64 5 10 2 2 2 2 4 7 Unit Test Conditions/Comments ns Mbps ns ns ps/C ns Within PWD limit Within PWD limit 50% input to 50% output |tPLH - tPHL| ns ns ns tPSK is the magnitude of the worst-case difference in tPHL or tPLH that is measured between units at the same operating temperature, supply voltages, and output load within the recommended operating conditions. Table 5. Parameter SUPPLY CURRENT ADuM7240 ADuM7241 Symbol Min 1 Mbps--A, C Grades Typ Max IDD1 IDD2 IDD1 IDD2 1.6 1.3 1.4 1.4 Min 25 Mbps--C Grade Typ Max 2.0 1.6 1.8 1.8 12 2.6 6.7 5.9 15 4.4 9.2 8.2 Unit Test Conditions/Comments mA mA mA mA Table 6. For All Models Parameter DC SPECIFICATIONS Logic High Input Threshold Logic Low Input Threshold Logic High Output Voltages Logic Low Output Voltages Input Current per Channel Supply Current per Channel Quiescent Input Supply Current Quiescent Output Supply Current Dynamic Input Supply Current Dynamic Output Supply Current AC SPECIFICATIONS Output Rise/Fall Time Common-Mode Transient Immunity1 Refresh Rate 1 Symbol Min VIH VIL VOH 0.7 VDDx VDDx - 0.2 VDDx - 0.4 -10 IDDI(Q) IDDO(Q) IDDI(D) IDDO(D) tR/tF |CM| fr Max 0.3 VDDx VOL II Typ VDDx VDDx - 0.3 0.0 0.2 +0.01 0.71 0.59 0.20 0.02 15 0.1 0.4 +10 1.0 0.8 Unit Test Conditions/Comments V V V V V V A IOx = -20 A, VIx = VIxH IOx = -4 mA, VIx = VIxH IOx = 20 A, VIx = VIxL IOx = 4 mA, VIx = VIxL 0 V VIx VDDx mA mA mA/Mbps mA/Mbps 2.8 25 ns kV/s 550 kHz 10% to 90% VIx = VDDx, VCM = 1000 V, transient magnitude = 800 V DC data inputs |CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. Rev. B | Page 4 of 16 Data Sheet ADuM7240/ADuM7241 ELECTRICAL CHARACTERISTICS--MIXED 5 V/3.3 V OPERATION All typical specifications are at TA = 25C, VDD1 = 5 V, VDD2 = 3.3 V. Minimum/maximum specifications apply over the entire recommended operation range of 4.5 V VDD1 5.5 V, 3.0 V VDD2 3.6 V, and -40C TA +105C, unless otherwise noted. Switching specifications are tested with CL = 15 pF and CMOS signal levels, unless otherwise noted. Table 7. Parameter SWITCHING SPECIFICATIONS Pulse Width Data Rate Propagation Delay Pulse Width Distortion Change vs. Temperature Propagation Delay Skew1 Channel Matching Codirectional Opposing Direction Jitter 1 Symbol Min PW 250 tPHL, tPLH PWD A Grade Typ Max C Grade Typ Max Min 40 1 80 25 55 10 5 tPSK 20 tPSKCD tPSKOD 25 30 34 44 2 3 25 54 5 10 2 3 2 2 5 9 Unit Test Conditions/Comments ns Mbps ns ns ps/C ns Within PWD limit Within PWD limit 50% input to 50% output |tPLH - tPHL| ns ns ns tPSK is the magnitude of the worst-case difference in tPHL or tPLH that is measured between units at the same operating temperature, supply voltages, and output load within the recommended operating conditions. Table 8. Parameter SUPPLY CURRENT ADuM7240 ADuM7241 Symbol 1 Mbps--A, C Grades Min Typ Max IDD1 IDD2 IDD1 IDD2 2.2 1.3 1.9 1.4 25 Mbps--C Grade Min Typ Max 2.9 1.6 2.3 1.6 16 2.8 9.2 5.9 Unit 21 3.6 12 7.2 Test Conditions/Comments mA mA mA mA Table 9. For All Models Parameter DC SPECIFICATIONS Logic High Input Threshold Logic Low Input Threshold Logic High Output Voltages Logic Low Output Voltages Input Current per Channel Supply Current per Channel Quiescent Input Supply Current Quiescent Output Supply Current Dynamic Input Supply Current Dynamic Output Supply Current AC SPECIFICATIONS Output Rise/Fall Time Common-Mode Transient Immunity1 Refresh Rate 1 Symbol Min VIH VIL VOH 0.7 VDDx VDDx - 0.1 VDDx- 0.4 -10 IDDI(Q) IDDO(Q) IDDI(D) IDDO(D) tR/tF |CM| fr Max 0.3 VDDx VOL II Typ VDDx VDDx - 0.3 0.0 0.2 +0.01 1.0 0.59 0.25 0.02 15 0.1 0.4 +10 1.45 0.80 Unit Test Conditions/Comments V V V V V V A IOx = -20 A, VIx = VIxH IOx = -4 mA, VIx = VIxH IOx = 20 A, VIx = VIxL IOx = 4 mA, VIx = VIxL 0 V VIx VDDx mA mA mA/Mbps mA/Mbps 2.5 25 ns kV/s 600 kHz 10% to 90% VIx = VDDx, VCM = 1000 V, transient magnitude = 800 V DC data inputs |CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. Rev. B | Page 5 of 16 ADuM7240/ADuM7241 Data Sheet ELECTRICAL CHARACTERISTICS--MIXED 3.3 V/5 V OPERATION All typical specifications are at TA = 25C, VDD1 = 3.3 V, VDD2 = 5 V. Minimum/maximum specifications apply over the entire recommended operation range of 3.0 V VDD1 3.6 V, 4.5 V VDD2 5.5 V, and -40C TA +105C, unless otherwise noted. Switching specifications are tested with CL = 15 pF and CMOS signal levels, unless otherwise noted. Table 10. Parameter SWITCHING SPECIFICATIONS Pulse Width Data Rate Propagation Delay Pulse Width Distortion Change vs. Temperature Propagation Delay Skew1 Channel Matching Codirectional Opposing Direction Jitter 1 Symbol Min PW 250 tPHL, tPLH PWD A Grade Typ Max Min C Grade Typ Max 40 1 80 25 55 10 5 tPSK 20 tPSKCD tPSKOD 25 30 35 25 59 5 47 2 3 10 2 5 2 2 5 10 Unit Test Conditions/Comments ns Mbps ns ns ps/C ns Within PWD limit Within PWD limit 50% input to 50% output |tPLH - tPHL| ns ns ns tPSK is the magnitude of the worst-case difference in tPHL or tPLH that is measured between units at the same operating temperature, supply voltages, and output load within the recommended operating conditions. Table 11. Parameter SUPPLY CURRENT ADuM7240 ADuM7241 Symbol 1 Mbps--A, C Grades Typ Max Min IDD1 IDD2 IDD1 IDD2 1.6 1.7 1.4 1.9 25 Mbps--C Grade Min Typ Max 2.0 2.1 1.6 2.3 12 3.8 6.8 8.2 15 4.8 8.2 10.2 Unit Test Conditions/Comments mA mA mA mA Table 12. For All Models Parameter DC SPECIFICATIONS Logic High Input Threshold Logic Low Input Threshold Logic High Output Voltages Logic Low Output Voltages Input Current per Channel Supply Current per Channel Quiescent Input Supply Current Quiescent Output Supply Current Dynamic Input Supply Current Dynamic Output Supply Current AC SPECIFICATIONS Output Rise/Fall Time Common-Mode Transient Immunity1 Refresh Rate 1 Symbol Min VIH VIL VOH 0.7 VDDx VDDx - 0.1 VDDx - 0.4 -10 IDDI(Q) IDDO(Q) IDDI(D) IDDO(D) tR/tF |CM| fr Max 0.3 VDDx VOL II Typ VDDx VDDx - 0.3 0.0 0.2 +0.01 0.71 0.80 0.20 0.03 15 0.1 0.4 +10 1.0 1.1 Unit Test Conditions/Comments V V V V V V A IOx = -20 A, VIx = VIxH IOx = -4 mA, VIx = VIxH IOx = 20 A, VIx = VIxL IOx = 4 mA, VIx = VIxL 0 V VIx VDDx mA mA mA/Mbps mA/Mbps 2.5 25 ns kV/s 550 kHz 10% to 90% VIx = VDDx, VCM = 1000 V, transient magnitude = 800 V DC data inputs |CM| is the maximum common-mode voltage slew rate that can be sustained while maintaining VO > 0.8 VDDx. The common-mode voltage slew rates apply to both rising and falling common-mode voltage edges. Rev. B | Page 6 of 16 Data Sheet ADuM7240/ADuM7241 PACKAGE CHARACTERISTICS Table 13. Parameter Resistance (Input-to-Output)1 Capacitance (Input-to-Output)1 Input Capacitance2 IC Junction-to-Ambient Thermal Resistance 1 2 Symbol RI-O CI-O CI JA Min Typ 1013 2 4 85 Max Unit pF pF C/W Test Conditions/Comments f = 1 MHz Thermocouple located at center of package underside The device is considered a 2-terminal device: Pin 1 through Pin 4 are shorted together, and Pin 5 through Pin 8 are shorted together. Input capacitance is from any input data pin to ground. REGULATORY INFORMATION The ADuM7240/ADuM7241 are pending approval by the organizations listed in Table 14. See Table 18 and the Insulation Lifetime section for recommended maximum working voltages for specific cross-isolation waveforms and insulation levels. Table 14. UL Recognized Under UL 1577 Component Recognition Program1 Single Protection, 1000 V rms Isolation Voltage File E214100 1 In accordance with UL 1577, each ADuM7240/ADuM7241 is proof tested by applying an insulation test voltage 1200 V rms for 1 sec (current leakage detection limit = 5 A). INSULATION AND SAFETY-RELATED SPECIFICATIONS Table 15. Parameter Rated Dielectric Insulation Voltage Minimum External Air Gap (Clearance) Symbol L(I01) Value 1000 4.0 Unit V rms mm min Minimum External Tracking (Creepage) L(I02) 4.0 mm min Minimum Internal Gap (Internal Clearance) Tracking Resistance (Comparative Tracking Index) Isolation Group CTI 2.6 >175 IIIa m min V RECOMMENDED OPERATING CONDITIONS Table 16. 250 Parameter Operating Temperature Supply Voltages1 Input Signal Rise and Fall Times 200 150 1 100 50 0 0 50 100 150 AMBIENT TEMPERATURE (C) Symbol TA VDD1, VDD2 Min -40 3.0 Max +105 5.5 1.0 All voltages are relative to their respective ground. See the DC Correctness section for information about immunity to external magnetic fields. 10240-003 SAFETY-LIMITING CURRENT (mA) 300 Test Conditions/Comments 1-minute duration Measured from input terminals to output terminals, shortest distance through air Measured from input terminals to output terminals, shortest distance path along body Distance through insulation DIN IEC 112/VDE 0303 Part 1 Material Group (DIN VDE 0110, 1/89, Table 1) 200 Figure 3. Thermal Derating Curve, Dependence of Safety-Limiting Values with Ambient Temperature per DIN V VDE V 0884-10 Rev. B | Page 7 of 16 Unit C V ms ADuM7240/ADuM7241 Data Sheet ABSOLUTE MAXIMUM RATINGS TA = 25C, unless otherwise noted. 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. Table 17. Parameter Storage Temperature (TST) Range Ambient Operating Temperature (TA) Range Supply Voltages (VDD1, VDD2) Input Voltages (VIA, VIB)1 Output Voltages (VOA, VOB)1 Average Output Current per Pin2 Side 1 (IO1) Side 2 (IO2) Common-Mode Transients3 Rating -65C to +150C -40C to +105C -0.5 V to +7.0 V -0.5 V to VDDI + 0.5 V -0.5 V to VDDO + 0.5 V ESD CAUTION -10 mA to +10 mA -10 mA to +10 mA -100 kV/s to +100 kV/s 1 VDDI and VDDO refer to the supply voltages on the input and output sides of a given channel, respectively. See the Printed Circuit Board Layout section. See Figure 3 for maximum rated current values for various temperatures. 3 Refers to common-mode transients across the insulation barrier. Commonmode transients exceeding the absolute maximum ratings may cause latchup or permanent damage. 2 Table 18. Maximum Continuous Working Voltage1 Parameter AC Voltage, Bipolar Waveform DC Voltage 1 Max 300 300 Unit V rms V dc Constraint 50-year minimum lifetime 50-year minimum lifetime Refers to continuous voltage magnitude imposed across the isolation barrier. See the Insulation Lifetime section for more details. Table 19. ADuM7240 Truth Table (Positive Logic)1 VIA Input H L H L X VIB Input H L L H X VDD1 State Powered Powered Powered Powered Unpowered VDD2 State Powered Powered Powered Powered Powered VOA Output H L H L H VOB Output H L L H H X X Powered Unpowered Indeterminate Indeterminate 1 Notes Outputs return to the input state within 1 s of VDDI power restoration. Outputs return to the input state within 1 s of VDDO power restoration. H = high, L = low, X = don't care. Table 20. ADuM7241 Truth Table (Positive Logic)1 VIA Input H L H L X VIB Input H L L H X VDD1 State Powered Powered Powered Powered Unpowered VDD2 State Powered Powered Powered Powered Powered VOA Output H L H L Indeterminate VOB Output H L L H H X X Powered Unpowered H Indeterminate 1 H = high, L = low, X = don't care. Rev. B | Page 8 of 16 Notes Outputs return to the input state within 1 s of VDDI power restoration. Outputs return to the input state within 1 s of VDDO power restoration. Data Sheet ADuM7240/ADuM7241 VDD1 1 VIA 2 VIB 3 8 ADuM7240 VDD2 7 TOP VIEW (Not to Scale) VOA 6 VOB 5 GND2 GND1 4 10240-004 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. ADuM7240 Pin Configuration Table 21. ADuM7240 Pin Function Descriptions Mnemonic VDD1 VIA VIB GND1 GND2 VOB VOA VDD2 Description 3.0 V to 5.5 V Supply Voltage for Isolator Side 1. Logic Input A. Logic Input B. Ground 1. Ground reference for Isolator Side 1. Ground 2. Ground reference for Isolator Side 2. Logic Output B. Logic Output A. 3.0 V to 5.5 V Supply Voltage for Isolator Side 2. VDD1 1 VOA 2 VIB 3 GND1 4 ADuM7241 TOP VIEW (Not to Scale) 8 VDD2 7 VIA 6 VOB 5 GND2 10240-005 Pin No. 1 2 3 4 5 6 7 8 Figure 5. ADuM7241 Pin Configuration Table 22. ADuM7241 Pin Function Descriptions Pin No. 1 2 3 4 5 6 7 8 Mnemonic VDD1 VOA VIB GND1 GND2 VOB VIA VDD2 Description 3.0 V to 5.5 V Supply Voltage for Isolator Side 1. Logic Output A. Logic Input B. Ground 1. Ground reference for Isolator Side 1. Ground 2. Ground reference for Isolator Side 2. Logic Output B. Logic Input A. 3.0 V to 5.5 V Supply Voltage for Isolator Side 2. Rev. B | Page 9 of 16 ADuM7240/ADuM7241 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 10 20 8 CURRENT (mA) CURRENT (mA) 15 6 5V 4 10 5V 3V 5 3V 0 0 5 10 15 20 25 10240-009 10240-006 2 0 0 30 5 15 10 20 25 30 DATA RATE (Mbps) DATA RATE (Mbps) Figure 6. Typical Supply Current per Input Channel vs. Data Rate for 5 V and 3 V Operation Figure 9. Typical ADuM7240 VDD1 Supply Current vs. Data Rate for 5 V and 3 V Operation 5 4 4 CURRENT (mA) CURRENT (mA) 3 2 5V 3 5V 2 1 3V 1 0 0 5 10 15 20 25 10240-010 10240-007 3V 0 30 0 5 DATA RATE (Mbps) 10 15 20 25 30 DATA RATE (Mbps) Figure 7. Typical Supply Current per Output Channel vs. Data Rate for 5 V and 3 V Operation (No Output Load) Figure 10. Typical ADuM7240 VDD2 Supply Current vs. Data Rate for 5 V and 3 V Operation 10 4 8 CURRENT (mA) CURRENT (mA) 3 5V 2 6 5V 4 3V 3V 1 0 0 5 10 15 20 25 10240-011 10240-008 2 0 0 30 5 10 15 20 25 30 DATA RATE (Mbps) DATA RATE (Mbps) Figure 11. Typical ADuM7241 VDD1 Supply Current vs. Data Rate for 5 V and 3 V Operation Figure 8. Typical Supply Current per Output Channel vs. Data Rate for 5 V and 3 V Operation (15 pF Output Load) Rev. B | Page 10 of 16 Data Sheet ADuM7240/ADuM7241 10 6 5V 4 3V 2 10240-012 CURRENT (mA) 8 0 0 5 10 15 20 25 30 DATA RATE (Mbps) Figure 12. Typical ADuM7241 VDD2 Supply Current vs. Data Rate for 5 V and 3 V Operation Rev. B | Page 11 of 16 ADuM7240/ADuM7241 Data Sheet APPLICATIONS INFORMATION PRINTED CIRCUIT BOARD LAYOUT The ADuM7240/ADuM7241 digital isolators require no external interface circuitry for the logic interfaces. Power supply bypassing is strongly recommended at both input and output supply pins: VDD1 and VDD2. The capacitor value should be between 0.01 F and 0.1 F. The total lead length between both ends of the capacitor and the input power supply pin should not exceed 20 mm. In applications involving high common-mode transients, it is important to minimize board coupling across the isolation barrier. Furthermore, users should design the board layout so that any coupling that does occur affects all pins on a given component side equally. Failure to ensure this can cause voltage differentials between pins exceeding the absolute maximum ratings of the device, thereby leading to latch-up or permanent damage. With proper PCB design choices, the ADuM7240/ADuM7241 can readily meet CISPR 22 Class A (and FCC Class A) emissions standards, as well as the more stringent CISPR 22 Class B (and FCC Class B) standards in an unshielded environment. Refer to the AN-1109 Application Note for PCB-related EMI mitigation techniques, including board layout and stack-up issues. PROPAGATION DELAY-RELATED PARAMETERS Propagation delay is a parameter that describes the time it takes a logic signal to propagate through a component. The input-tooutput propagation delay time for a high-to-low transition may differ from the propagation delay time for a low-to-high transition. INPUT (VIx) 50% tPHL OUTPUT (VOx) 50% 10240-013 tPLH Channel-to-channel matching refers to the maximum amount that the propagation delay differs between channels within a single ADuM7240/ADuM7241 component. Propagation delay skew refers to the maximum amount the propagation delay differs between multiple ADuM7240/ ADuM7241 components operating under the same conditions. DC CORRECTNESS Positive and negative logic transitions at the isolator input cause narrow (~1 ns) pulses to be sent to the decoder via the transformer. The decoder is bistable and is, therefore, either set or reset by the pulses, indicating input logic transitions. In the absence of logic transitions at the input for more than ~1 s, a periodic set of refresh pulses indicative of the correct input state is sent to ensure dc correctness at the output. If the decoder receives no internal pulses for more than approximately 5 s, the input side is assumed to be unpowered or nonfunctional, and the isolator output is forced to a default high state by the watchdog timer circuit. MAGNETIC FIELD IMMUNITY The magnetic field immunity of the ADuM7240/ADuM7241 is determined by the changing magnetic field, which induces a voltage in the transformer's receiving coil large enough to either falsely set or reset the decoder. The following analysis defines the conditions under which this can occur. The 3 V operating condition of the ADuM7240/ADuM7241 is examined because it represents the most susceptible mode of operation. The pulses at the transformer output have an amplitude greater than 1.0 V. The decoder has a sensing threshold at about 0.5 V, thus establishing a 0.5 V margin in which induced voltages can be tolerated. The voltage induced across the receiving coil is given by V = (-d/dt) rn2; n = 1, 2, ... , N Figure 13. Propagation Delay Parameters Pulse width distortion is the maximum difference between these two propagation delay values and is an indication of how accurately the timing of the input signal is preserved. where: is the magnetic flux density (gauss). rn is the radius of the nth turn in the receiving coil (cm). N is the number of turns in the receiving coil. Given the geometry of the receiving coil in the ADuM7240/ ADuM7241 and an imposed requirement that the induced voltage be, at most, 50% of the 0.5 V margin at the decoder, a maximum allowable magnetic field at a given frequency can be calculated. The result is shown in Figure 14. Rev. B | Page 12 of 16 ADuM7240/ADuM7241 Note that with extreme combinations of strong magnetic field and high frequency current, loops formed by printed circuit board traces can induce error voltages large enough to trigger the thresholds of receiver circuitry. Take care in the layout of such traces to avoid this possibility. 1000 100 10 POWER CONSUMPTION 1 The supply current at a given channel of the ADuM7240/ ADuM7241 isolator is a function of the supply voltage, the data rate of the channel, and the output load of the channel. 0.1 0.01 0.001 1k For each input channel, the supply current is given by 10240-014 MAXIMUM ALLOWABLE MAGNETIC FLUX (kgauss) Data Sheet 10M 10k 100k 1M MAGNETIC FIELD FREQUENCY (Hz) 100M Figure 14. Maximum Allowable External Magnetic Flux Density For example, at a magnetic field frequency of 1 MHz, the maximum allowable magnetic field of 0.5 kgauss induces a voltage of 0.25 V at the receiving coil. This voltage is about 50% of the sensing threshold and does not cause a faulty output transition. Similarly, if such an event occurs during a transmitted pulse (and is of the worst-case polarity), it reduces the received pulse from >1.0 V to 0.75 V, still well above the 0.5 V sensing threshold of the decoder. The preceding magnetic flux density values correspond to specific current magnitudes at given distances from the ADuM7240/ADuM7241 transformers. Figure 15 shows these allowable current magnitudes as a function of frequency for selected distances. As shown in Figure 15, the ADuM7240/ ADuM7241 is extremely immune and can be affected only by extremely large currents operated at high frequency very close to the component. For the 1 MHz example, a 1.2 kA current placed 5 mm away from the ADuM7240/ADuM7241 is required to affect the operation of the component. 100 10 1 0.1 DISTANCE = 5mm DISTANCE = 100mm DISTANCE = 1m 0.01 f 0.5 fr IDDI = IDDI(D) x (2f - fr) + IDDI(Q) f > 0.5 fr For each output channel, the supply current is given by IDDO = IDDO(Q) f 0.5 fr -3 IDDO = (IDDO(D) + (0.5 x 10 ) x CL x VDDO) x (2f - fr) + IDDO(Q) f > 0.5 fr where: IDDI(D), IDDO(D) are the input and output dynamic supply currents per channel (mA/Mbps). CL is the output load capacitance (pF). VDDO is the output supply voltage (V). f is the input logic signal frequency (MHz); it is half the input data rate, expressed in units of Mbps. fr is the input stage refresh rate (Mbps). IDDI(Q), IDDO(Q) are the specified input and output quiescent supply currents (mA). To calculate the total VDD1 and VDD2 supply current, the supply currents for each input and output channel corresponding to VDD1 and VDD2 are calculated and totaled. Figure 6 and Figure 7 show per-channel supply currents as a function of data rate for an unloaded output condition. Figure 8 shows the per-channel supply current as a function of data rate for a 15 pF output condition. Figure 9 through Figure 12 show the total VDD1 and VDD2 supply current as a function of data rate for ADuM7240 and ADuM7241 channel configurations. INSULATION LIFETIME 1k 10k 10M 100k 1M MAGNETIC FIELD FREQUENCY (Hz) Figure 15. Maximum Allowable Current for Various Current-to-ADuM7240/ADuM7241 Spacings 10240-015 MAXIMUM ALLOWABLE CURRENT (kA) 1000 IDDI = IDDI(Q) 100M All insulation structures eventually break down when subjected to voltage stress over a sufficiently long period. The rate of insulation degradation is dependent on the characteristics of the voltage waveform applied across the insulation. In addition to the testing performed by the regulatory agencies, Analog Devices carries out an extensive set of evaluations to determine the lifetime of the insulation structure within the ADuM7240/ ADuM7241. Analog Devices performs accelerated life testing using voltage levels higher than the rated continuous working voltage. Acceleration factors for several operating conditions are determined. These factors allow calculation of the time to failure at the actual working voltage. The values shown in Table 18 summarize the working voltage for 50 years of service life. Rev. B | Page 13 of 16 ADuM7240/ADuM7241 Data Sheet OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890) 1 5 6.20 (0.2441) 5.80 (0.2284) 4 1.27 (0.0500) BSC 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 0.10 SEATING PLANE 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-AA 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 16. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) ORDERING GUIDE Model1 ADuM7240ARZ ADuM7240ARZ-RL7 No. of Inputs, VDD1 Side 2 2 No. of Inputs, VDD2 Side 0 0 Maximum Data Rate (Mbps) 1 1 Maximum Propagation Delay, 5 V (ns) 75 75 Temperature Range -40C to +105C -40C to +105C ADuM7240CRZ ADuM7240CRZ-RL7 2 2 0 0 25 25 50 50 -40C to +105C -40C to +105C ADuM7241ARZ ADuM7241ARZ-RL7 1 1 1 1 1 1 75 75 -40C to +105C -40C to +105C ADuM7241CRZ ADuM7241CRZ-RL7 1 1 1 1 25 25 50 50 -40C to +105C -40C to +105C 1 Z = RoHS Compliant Part. Rev. B | Page 14 of 16 Package Description 8-Lead SOIC_N 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 7" Tape and Reel 8-Lead SOIC_N 8-Lead SOIC_N, 7" Tape and Reel Package Option R-8 R-8 R-8 R-8 R-8 R-8 R-8 R-8 Data Sheet ADuM7240/ADuM7241 NOTES Rev. B | Page 15 of 16 ADuM7240/ADuM7241 Data Sheet NOTES (c)2012-2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D10240-0-10/15(B) Rev. B | Page 16 of 16 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Analog Devices Inc.: ADUM7240ARZ ADUM7240CRZ-RL7 ADUM7241CRZ-RL7 ADUM7241ARZ ADUM7240ARZ-RL7 ADUM7240CRZ ADUM7241CRZ ADUM7241ARZ-RL7