The ADuM31601
 is a USB port isolator based on Analog
Devices, Inc., iCoupler® technology. Combining high speed CMOS
and monolithic air core transformer technology, this isolation
component provides outstanding performance characteristics
and is easily integrated with low and full speed USB-compatible
peripheral devices.
Many microcontrollers implement USB so that it presents only the
D+ and D− lines to external pins. This is desirable in many cases
because it minimizes external components and simplifies the
design; however, this presents particular challenges when isolation
is required. Because the USB lines must switch between actively
driving D+/D− and allowing external resistors to set the state of
the bus, the ADuM3160 provides mechanisms for detecting the
direction of data flow and control over the state of the output
buffers. Data direction is determined on a packet-by-packet basis.
The ADuM3160 uses the edge detection based iCoupler
technology in conjunction with internal logic to implement
a transparent, easily configured, upstream-facing port isolator.
Isolating the upstream port provides several advantages in
simplicity, power management, and robust operation.
The isolator has a propagation delay comparable to that of a
standard hub and cable. It operates with the bus voltage on either
side ranging from 4.5 V to 5.5 V, allowing connection directly to
VBUSx by internally regulating the voltage to the signaling level.
The ADuM3160 provides isolated control of the pull-up resistor
to allow the peripheral to control connection timing. The device
draws low enough idle current that a suspend state is not required.
A 5 kV, reinforced insulation version, the ADuM4160, is available. 

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