LTM2884 USB Transceivers

By Analog Devices Inc 74

LTM2884 USB Transceivers

The LTM2884 from Linear Technology is a complete galvanically-isolated USB 2.0 compatible μModule (micromodule) transceiver. An upstream supply powers both sides of the interface through an integrated, isolated DC/DC converter. The LTM2884 is ideal for isolation in host, hub, bus splitter, or peripheral device applications. It is compatible with USB 2.0 full-speed (12 Mbps) and low-speed (1.5 Mbps) operation. Automatic speed selection configures integrated pull-up resistors on the upstream port to match those sensed on the downstream device.

The isolator μModule technology uses coupled inductors and an isolated power transformer to provide 2500 VRMS of isolation between the upstream and downstream USB interface. This device is ideal for systems requiring isolated ground returns or large common mode voltage variations. Uninterrupted communication is guaranteed for common mode transients greater than 30 kV / μs. Enhanced ESD protection allows this part to withstand up to ±15 kV (human body model) on the USB transceiver interface pins to local supplies and ±15 kV through the isolation barrier to supplies without latch-up or damage.

Video: Rugged USB Isolation

  • Isolated USB transceiver: 2500 VRMS for 1 minute
  • USB 2.0 full- and low-speed compatible
  • Integrated isolated DC/DC converter, external or bus powered
  • Auto-configuration of bus speed
  • 2.5 W (500 mA at 5 V) output power from external input supply (VCC = 8.6 V to 16.5 V)
  • 3.3 V LDO output supply signal references VLO, VLO2
  • 1 W (200 mA at 5 V) output power from USB bus supply (VBUS)
  • High-common mode transient immunity: 30 kV / µs
  • ESD: ±15 kV HBM on USB interface pins
  • 15 mm x 15 mm x 5 mm surface-mount BGA package
  • Isolated USB interfaces
  • Host, hub, or device isolation
  • Industrial / medical data acquisition