ADUM3160BRWZ

The ADuM3160 is a USB port isolator that combines high-speed CMOS processes with monolithic air-core transformer technology to deliver excellent operating performance and easy integration with low-speed and full-speed USB-compatible peripherals.

Many microcontroller USB implementations provide only D+ and D− lines to the external pins. This meets requirements in many cases, as it requires minimal external components and simplifies the design; however, it presents challenges when isolation is needed. Since the USB lines must switch between actively driving D+/D− and allowing external resistors to set the bus state, the ADuM3160 architecture can both detect data flow direction and control the state of the output buffers. Data flow direction is determined on a packet-by-packet basis.

The ADuM3160 combines edge-detection-based iCoupler technology with internal logic to implement a transparent, easy-to-configure, upstream-facing port isolator. Isolating the upstream port offers multiple advantages, including circuit simplicity, power management, and robust operation.

This isolator's propagation delay is comparable to that of standard hubs and cables. It can be powered from a 4.5 V to 5.5 V bus voltage on either side and internally regulates this voltage to the signal level, enabling direct connection to V_BUSx. The ADuM3160 provides isolated control of the pull-up resistors so that peripherals can control connection timing. The device draws very low current in the idle state, eliminating the need for a suspend state. An enhanced isolation version, the ADuM4160, rated at 2.5 kV, is also available.