Circuit Note CN-0422 Devices Connected/Referenced 5 kV RMS/3.75 kV RMS, 1.1 Gbps, Dual- ADN4654 Channel LVDS Isolator 2 ADuM1250 Hot Swappable, Dual I C Isolator Circuits from the Lab reference designs are engineered and tested for quick and easy system integration to help solve todays Low Emission Isolated DC-to-DC analog, mixed-signal, and RF design challenges. For more ADuM5020 Converter information and/or support, visit www.analog.com/CN0422. ADP7104 20 V, 500 mA, Low Noise, CMOS LDO 500 mA, Ultralow Power Step-Down ADP5302 Regulator Galvanic Isolation of the HDMI 1.3a Protocol Using iCoupler Isolation Technology defect monitoring camera) and HDMI sink (for example, a EVALUATION AND DESIGN SUPPORT camera control module or industrial display). Circuit Evaluation Boards CN-0422 Circuit Evaluation Board (EVAL-CN0422-EBZ) Isolation in the CN-0422 circuit increases system safety and Design and Integration Files robustness by providing protection against electrical line surges Schematics, Layout Files, Bill of Materials and breaks the ground connection between bus and digital pins, thereby removing possible ground loops within the system. CIRCUIT FUNCTION AND BENEFITS Several versions of the HDMI standard are available. The circuit The requirement to add galvanic isolation to a high speed shown in Figure 1 is compliant to Version 1.3a of the HDMI interface has traditionally been a nontrivial task. Data rates standard. Figure 1 includes isolation of high speed, transition above 250 Mbps are beyond the capabilities of optocouplers and minimized differential signaling (TMDS) clock and data lines, most digital isolators, forcing the system designer towards more which are implemented with current mode logic (CML) on the complex technologies such as optical fiber. Analog Devices, physical layer. Inc., iCoupler technology isolates the low voltage differential signaling (LVDS) physical layer at data rates in excess of 1 Gbps, The circuit shown in Figure 1 also provides bidirectional isolation reducing complexity in systems where both isolation and high of the consumer electronics control (CEC), hot plug detect (HPD), bandwidth are required. The interface between a surgical scope and display data channel (DDC) signals. Isolated power is pro- and the display monitor is one example where galvanic isolation vided to the high speed and bidirectional data isolators. The is required. CN-0422 circuit also provides 275 mW of isolated power to the HDMI sink device, as required by the HDMI Version 1.3a The circuit shown in Figure 1 provides a completely isolated standard. connection between a High-Definition Multimedia Interface (HDMI) source and HDMI sink device. Both signal and power The system can transparently isolate a HDMI interface that is isolation ensure a safe and noise immune connection between configured for resolutions of up to 1280p 720p (720p) at 60 Hz an HDMI source (for example, a medical endoscope or machine and is rated to a withstand voltage of 2500 V per UL 1577. Rev. 0 Circuits from the Lab reference designs from Analog Devices have been designed and built by Analog Devices engineers. Standard engineering practices have been employed in the design and construction of each circuit, and their function and performance have been tested and verified in a lab environment at room temperature. However, you are solely responsible for testing the circuit and One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. determining its suitability and applicability for your use and application. Accordingly, in no event shall Tel: 781.329.4700 www.analog.com Analog Devices be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause whatsoever connected to the use of any Circuits from the Lab circuits. (Continued on last page) Fax: 781.461.3113 2019 Analog Devices, Inc. All rights reserved. CN-0422 Circuit Note CML TO LVDS COUPLING NETWORK LVDS TO CML COUPLING NETWORK +3.3V ISO +3.3V +3.3V HDMI SINK HDMI SOURCE 100 10k 10k 10nF 10nF +3.3V +2.5V ISO TDMS DATA2+ TDMS DATA2+ 10k +3.3V ISO 10k +3.3V +3.3V 200 V V IN1 IN2 10k 10k 100 10nF V V DD1 DD2 TDMS DATA2 TDMS DATA2 D D OUT1+ IN1+ 10nF 10k 10k ADN4654 D D IN1 OUT1 D D IN2+ OUT2+ D D IN2 OUT2 TDMS DATA 1+ TDMS DATA1+ CML TO LVDS COUPLING NETWORK +3.3V +2.5V ISO GND GND 1 2 LVDS TO CML COUPLING NETWORK TDMS DATA1 TDMS DATA 1 V V IN1 IN2 V V DD1 DD2 TDMS DATA0+ TDMS DATA0+ CML TO LVDS COUPLING NETWORK D D IN1+ OUT1+ LVDS TO CML COUPLING NETWORK ADN4654 TDMS DATA0 D TDMS DATA0 D IN1 OUT1 D D IN2+ OUT2+ TDMS CLK+ TDMS CLK+ D D IN2 OUT2 CML TO LVDS COUPLING NETWORK LVDS TO CML COUPLING NETWORK GND GND 1 2 TDMS CLK TDMS CLK +5.0V +5.0V ISO V V DD1 DD2 +5.0V +5.0V ISO ADuM1250 27k 27k SDA SDA 1 2 CEC CEC SCL SCL 1 2 HOTPLUG DET HOTPLUG DET GND GND 1k 1 2 +5.0V +5.0V ISO V V DDC +5V DD1 DD2 +5.0V ADuM1250 +5.0V ISO 2k SDA SDA 1 2 DDC SDA DDC SDA SCL SCL 2 1 DDC SCL DDC SCL GND GND 2k 1 2 1PS76SB40 +5.0V ISO NIC NIC GND GND 1 ISO +5.0V V PDIS +5.0V ISO ADuM5020 SEL USB-MICRO-B +5.0V GND GND 1 ISO FERRITE V V 1 DDP ISO VBUS 6 GND 2 GND C6 1 ISO SHLD1 D 7 1F 100nF 10uF SHLD2 3 NIC NIC 8 D+ SHLD3 GND GND 4 ISO 9 1 ID SHLD4 +3.3V FERRITE 5 ADP7104ACPZ-3.3 GND 600 NIC NIC 8 VIN VOUT 1 GND GND 1 ISO 1M V PDIS SEL 0.01F ADuM5020 +5.0V ISO N/C 4 ADP5302 GND GND 1 ISO 2.2H +2.5V ISO FERRITE SENSE 2 1F V V DDP ISO PVIN SW 1F GND1 GND GND ISO 1 10F EN/UVLO PG 7 10F 5 220nF 10uF NIC NIC EN PGND 1M GND EP GND GND GND ISO 1 3 9 6 FERRITE FB SYNC/MODE GND2 STOP VINOK GND1 GND1 AGND VID EPAD Figure 1. Simplified Circuit Diagram for EVAL-CN0422-EBZ Rev. 0 Page 2 of 7 17074-001