ADUM3160

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.