회사 블로그 Recycle ADI Isolated Interface:Isolated CAN,Isolated I²C,Isolated LVDS

Recycle ADI Isolated Interface:Isolated CAN,Isolated I²C,Isolated LVDS

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Scope of Recycling and Collaboration Methods

Items Accepted: Factory stock, surplus materials from engineering projects, undamaged components from dismantled equipment, test samples, and discontinued or idle TI motor drivers

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ADI has leveraged its proprietary iCoupler® chip-scale transformer magnetic isolation technology to build a product portfolio of isolated interface solutions covering industrial, automotive, medical, test and measurement, automation equipment and AI hardware. Unlike traditional optocoupler isolation, this technology offers significant advantages in terms of power consumption, bandwidth, timing jitter, long-term stability and integration, enabling independent isolation of the signal and power sides, prevent ground loops, suppress common-mode interference, protect the host device, and meet safety insulation and surge protection requirements.

I. Isolated CAN

Isolated CAN transceivers are used between CAN protocol controllers and the CAN differential bus. They integrate iCoupler isolation, and some models feature an isoPower isolated power supply, enabling integrated signal and power isolation. This eliminates the need for an external isolated power supply design, simplifying the BOM and PCB layout. The devices are compatible with the ISO 11898 standard and support CAN 2.0A/B; some models support CAN FD high-speed mode. They feature bus short-circuit protection, thermal shutdown, ESD protection, bus silence and fault reporting functions, preventing chip damage, communication packet loss and message corruption caused by ground potential differences in high-interference environments.

Typical applications include automotive BMS, in-vehicle controllers, industrial fieldbuses, energy storage inverters, rail transport slave stations, and communication within humanoid robot power units. Compared to discrete solutions, these integrated isolated CAN transceivers offer isolation voltage ratings ranging from 2.5 kVrms to 5 kVrms, high common-mode transient immunity and stable transmission latency, making them suitable for multi-node, long-distance differential bus networking.

II. Isolated I²C

I²C is a bidirectional open-drain bus; the bidirectional interaction between SDA and SCL presents a challenge in isolation design. Conventional optocoupler solutions require the separation of transmit and receive channels and the addition of peripheral logic, whereas ADI’s isolated I²C devices natively support bidirectional open-drain channels without the need for direction control pins. They are perfectly suited to I²C arbitration, clock stretching and slave response mechanisms, support hot-swapping, and feature built-in sink current capability, meeting the isolation requirements for I²C peripherals such as sensors, EEPROMs, ADCs and I/O expansion chips.

Representative models include the ADuM1250, ADuM1254, ADuM1255, ADuM2250 and ADuM2251. They support clock rates of up to 2 MHz, a wide logic voltage range of 3.0 V to 5.5 V, and can perform level conversion between 3.3 V and 5 V domains. They operate at temperatures up to 125 °C, with some automotive-grade models certified to AEC-Q100 and offering isolation ratings of up to 5 kVrms. Typical applications include: isolated sampling in industrial data acquisition modules; front-end sensor arrays in medical devices; PMBus on power monitoring boards; hot-swappable modules; and internal I²C sensor links in battery management systems.

III. Isolated LVDS

Isolated LVDS is ADI’s high-speed isolated interface product line, designed for high-speed differential point-to-point transmission. It complies with the TIA/EIA-644-A standard and is based on an optimised iCoupler high-speed isolation unit. It features low jitter and low propagation delay, addressing the challenges of high-speed LVDS link transmission across isolation domains and serving as a cost-effective alternative to more expensive fibre-optic transceivers and SerDes solutions.

The core series comprises the ADN4650, ADN4651, ADN4652 and ADN4656, with single-channel data rates ranging from 600 Mbps to 1.1 Gbps; higher-specification high-speed isolation solutions can achieve up to 2.5 Gbps per channel, with typical random jitter as low as 2.6 ps rms, total peak-to-peak jitter controlled to the order of hundreds of picoseconds, propagation delay of just 4 ns, strong common-mode interference immunity for differential signals, and high-level ESD protection. They are suitable for high-speed image transmission between boards, FPGA interconnects, high-speed data links in test equipment, medical image acquisition, and high-speed vision signal transmission in automated equipment. The LVDS isolator features a pass-through differential buffer architecture with a pin bus design, enabling simple hardware replacement. It supports multi-channel configurations and is suitable for building multi-lane high-speed isolated links.