CN0419 is a circuit that isolates a peripheral device that already implements a USB interface by using the ADuM4160, a USB port isolator based on Analog Devices iCoupler technology. It is bus-powered by pairing it with a small isolated dc-to-dc converter such as the ADuM5020. The application circuit shown is typical of many medical and industrial applications.
The ADuM4160 is a USB port isolator, based on Analog Devices, Inc., iCoupler® technology. Combining high speed CMOS and monolithic air core transformer technology, these isolation components provide outstanding performance characteristics and are easily integrated with low and full speed USB-compatible peripheral devices.
The ADuM5020 is an isoPower®, integrated, isolated dc-to-dc converter. Based on the Analog Devices, Inc., iCoupler® technology, this dc-to-dc converter provides regulated, isolated power that is below CISPR22 Class B limits at full load on a 2-layer printed circuit board (PCB) with ferrites.
The EVAL-CN0419-EBZ board connects through a USB Type A Plug and is powered by the bus voltage from the USB port.
Peripheral devices run at one of three speeds, low (1.5 Mbps), full (12 Mbps), and high (480 Mbps). The EVAL-CN0419-EBZ Evaluation Board can accommodate the low and full speed operations. Listed below are some examples of peripheral devices for each speed.
The isolator is hardwired for the desired speed setting, either full speed or low speed. A switch at the upstream side allows the user to select between these speeds. To switch between the two modes, flip the actuator of S1 switch to FS mode as indicated in silkscreen for full speed operation and LS mode otherwise.
Low speed operation
Full speed operation
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