4 Mbps CAN transceiver with ±60V fault protection

February 19, 2015 // By Graham Prophet
LTC2875 is an “exceptionally” rugged, high voltage tolerant CAN (controller area network) transceiver designed to greatly reduce field failures without the need of costly external protection devices.

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