In practical CAN systems, installation cross-wiring faults, ground voltage faults or lightning induced surge voltages can cause overvoltage conditions that exceed absolute maximum ratings of typical transceivers. The LTC2875 features ±60V overvoltage fault and ±25 kV HBM ESD protection on the data transmission lines, protecting bus pins during operation and shutdown. Whether a circuit is transmitting, receiving or powered off, the LTC2875 tolerates any voltage within ±60V without damage, increasing the robustness of typical CAN networks.
The CAN bus has a well defined protocol stack, with support for standalone controllers, FPGAs and ASICs, making implementation easier over alternative interfaces, such as RS485. The LTC2875 provides the flexibility to be powered from a 3.3V or 5V rail, which is very useful in industrial applications where a 5V rail may not be present. In addition to the high fault and ESD protection, the device features a low electromagnetic emission (EME) driver with a transmit data (TXD) dominant timer to prevent faulty controllers from clamping the bus, as well as a high electromagnetic immunity (EMI) receiver with an extended ±36V common mode range to enable operation in electrically noisy environments and in the presence of ground loops. The LTC2875 features a high speed data rate of 4 Mbps with an adjustable slew rate for data rates as low as 1 kbps. A shutdown mode brings all of the LTC2875’s outputs to high impedance and reduces power consumption to 1 µA.
The LTC2875 is offered in commercial, industrial, automotive and military (-55°C to 125°C) temperature grades and is available in 3 x 3mm DFN-8 and SO-8 packages, with industry-standard pinouts. Pricing starts at $1.72 (1000).
Linear Technology; www.linear.com/products/CAN_Transceivers