ایزولاتور ایزولاتور دیجیتال

Product Attributes

Introduction

The ADuM1280/ADuM1281/ADuM1285/ADuM1286 (also referred to as ADuM128x in this data sheet) are dual-channel digital isolators based on ADI's iCoupler technology. These isolation devices combine high-speed CMOS with monolithic air-core transformer technology, delivering superior performance characteristics over alternatives such as optocouplers and other integrated coupler devices.

These devices feature a propagation delay of 20 ns, with Grade C pulse width distortion less than 2 ns. Grade C also offers tight channel-to-channel matching of 5 ns. The ADuM128x dual channels are independent isolation channels, available in two configuration options and three different data rates, up to 100 Mbps. Industrial-grade models operate from a 2.7 V to 5.5 V supply voltage, while automotive-grade models operate from 3.0 V to 5.5 V, ensuring compatibility with low-voltage systems and enabling voltage translation across the isolation barrier. Unlike conventional optocouplers, ADuM128x isolators feature a patented refresh function that ensures DC correctness in the absence of input logic transitions. Upon initial power-up or when power has not yet been applied to the input side, the ADuM1280 and ADuM1281 default to a logic high output, while the ADuM1285 and ADuM1286 default to a logic low output.

Features

• Data rate up to 100 Mbps (NRZ)
• Low propagation delay: 20 ns (typical)
• Low dynamic power consumption
• Bidirectional communication
• 3 V to 5 V level translation
• Operating temperature up to 125°C
• High common-mode transient immunity: >25 kV/μs
• Default output high: ADuM1280/ADuM1281
• Default output low: ADuM1285/ADuM1286
• 8-lead narrow-body SOIC package, RoHS compliant
• Safety and regulatory approvals — UL recognition: per UL 1577, 1 minute at 3,000 V rms
• CSA Component Acceptance Notice #5A
• VDE certified per DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12, VIORM = 560 V peak
• Automotive application qualified

Applications

• General-purpose multi-channel isolation
• Data converter isolation
• Industrial fieldbus isolation
• Hybrid electric vehicles, battery monitors, and motor drives