In practical CAN systems, Linear says, ground potentials vary widely from node to node, often exceeding the tolerable range, which can result in an interruption of communications or destruction of a transceiver. The LTM2889 separates grounds by isolating the CAN transceiver using internal inductive isolation. It implements multiple levels of protection to improve system reliability, including 2,500 VRMS of galvanic isolation, ±60V bus voltage fault tolerance, greater than 30kV/µsec common mode transient immunity, and ±25 kV HBM ESD protection. The LTM2889 requires no external components, ensuring a complete and robust µModule solution
for isolated serial data communications.
The LTM2889 features an integrated, low EMI, DC/DC converter that powers the isolated transceiver and provides up to 0.75W of isolated power for CAN node components. The device features an extended ±36V common mode range to enable operation in electrically noisy environments and in the presence of ground loops. The LTM2889 operates at data rates between 22 kbps and 4 Mbps, with an adjustable slew rate to reduce EMI at lower data rates. A shutdown mode brings all of the LTM2889’s outputs to high impedance and reduces power consumption to less than 1 µA.
The LTM2889 comes in commercial, industrial and automotive temperature grades and is available in a low profile 15 x 11.25 x 3.42 mm surface mount BGA package for $9.96 (1,000).
Linear Technology; www.linear.com/isolator