Industry’s First Fully Isolated Industrial CAN Transceivers

Analog Devices, Inc. has expanded its industry-leading isolated interface product portfolio with two transceivers that are the first to isolate both data signals and power for systems using the CAN (control-area network) communications bus. The ADM3052 and ADM3053 use ADI’s iCoupler digital isolation technology; the ADM3053 also includes an isoPower integrated, isolated dc-to-dc converter, reducing component count by up to 80 percent compared to competing alternatives that require multiple discrete devices, and consuming 70 percent less board space than discrete competitive options. Watch a video on the ADM3052 and ADM3053 CAN transceivers.

“CAN was originally developed for the automotive industry, but has become widely adopted in industrial and instrumentation systems, including factory automation, building controls, wind turbines, and elevators, in which communication with and management of multiple sub-systems is essential,” said Mike Britchfield, vice president, Industrial and Instrumentation Group, Analog Devices. “Targeted specifically for the industrial and instrumentation market, the ADM3052 and ADM3053 are the first transceivers to combine signal and power isolation in a single device for DeviceNet, CANOpen, and other CAN-based communications applications.”

The ADM3052 and ADM3053 extend ADI’s portfolio of isolated bus communication products that includes similar products for other popular industrial and instrumentation protocols, including RS-485/422, RS-232, USB (universal serial bus) and I2C. These isolated communication products integrate ADI’s transceiver devices with iCoupler digital isolation technology and isoPower integrated, isolated dc-to-dc converters and have already helped simplify customer product designs by integrating signal and power isolation into single, small-form-factor packages. Extending this same level of integration to the CAN-bus standard, the ADM3052 and ADM3053 transceivers deliver the reliability, performance, and control required by today’s sophisticated industrial equipment and at the same time reduce design complexity and help customers accelerate their time to market. Download the ADM3052, ADM3053 data sheet or order samples.

About the ADM3052 and ADM3053 CAN transceivers

The ADM3052 CAN transceiver offers 5-kVrms isolation between a 4-wire CAN-bus configuration and a microcontroller or DSP (digital signal processor), while providing the physical layer properties required by the CAN-bus specification. The 4-wire CAN-bus configuration includes two data lines, 24-V power supply, and the power supply current return path. The ADM3052 integrates a 24-V LDO (low-dropout regulator), three channels of ADI’s iCoupler digital signal isolation technology and the physical layer CAN transceiver. The ADM3052 also integrates protection against wiring faults, and a bus power-sense function, which provides an isolated signal to the microcontroller or DSP to indicate whether the 24-V bus power supply is present or not.

The ADM3053 CAN transceiver provides 2.5-kVrms isolation between a 2-wire CAN-bus configuration and a microcontroller or DSP. The 2-wire CAN-bus configuration includes only the two data lines, with bus-side power provided by ADI’s proprietary isoPower® dc-to-dc converter technology from the microcontroller or DSP side of the isolation barrier. The ADM3053 includes an oscillator, rectifier, regulator, two channels of iCoupler digital signal isolation technology and the physical CAN transceiver with integrated wire-fault protection.

The ADM3052 and ADM3053 CAN transceivers are pending safety and regulatory isolation standards certification by UL (Underwriters Laboratories) and VDE (Verband der Elektrotechnik). The products are available in small, surface-mountable, wide-body SOIC (small-outline integrated circuit) packages. The wide-body SOIC package allows the use of standard pick-and-place manufacturing equipment and provides excellent performance in high vibration environments. Additionally, the 0.2-mm minimum clearance above the PCB helps ensure that isolation clearance requirements are met in high-impurity industrial environments.

Pricing, availability and complementary components

ADI’s ADM3052 and ADM3053 CAN transceivers are well suited to operate with other ADI components, including the ADM2578E and ADM2582E isolated RS-485 transceivers, ADM3251E isolated RS-232 line driver/receiver, ADuM4160 isolated USB transceiver and ADI’s ADSP-BF506F Blackfin® processor with CAN controller. Learn more about ADI’s interface products.

iCoupler Digital Isolation Technology

With more than 450 million channels deployed, ADI’s proven iCoupler technology is based on chipscale transformers, rather than on the LEDs and photodiodes found in optocouplers. Transformers support higher data rates, consume less power, and are more stable over life as compared to LEDs and photodiodes. By fabricating the transformers directly on-chip using wafer-level processing, iCoupler channels can be integrated with each other and other semiconductor functions at low cost. iCoupler transformers are planar structures formed from CMOS and gold metal layers. A high breakdown polyimide layer underneath the gold layer insulates the top transformer coil from the bottom resulting in the most reliable and highest level of digital isolation available. CMOS circuits connected to the top coil and bottom coil provide the interface between each transformer and its external signals.

isoPower DC-to-DC Converter Technology

ADI’s isoPower dc-to-dc converter uses the same chip-scale transformer technology, but instead of transmitting data, the isoPower feature employs switches, rectifiers, and regulators to generate power that is isolated to the same degree as the data channels. For more on ADI’s technique for isolating power, please visit: www.analog.com/icoupler. The on-board isoPower isolated dc-to-dc converter can provide up to 500 mW of regulated, isolated power and can operate at either 5.0 V or 3.3 V.