2. Product Overview

2.1 Isolation Channel Description

The operation of a Si8285 or Si8286 channel is analogous to that of an optocoupler and gate driver, except an RF carrier is modulated

instead of light. This simple architecture provides a robust isolated data path and requires no special considerations or initialization at

start-up. A simplified block diagram for a single Si828x channel is shown in the figure below.

RF

OSCILLATOR

MODULATOR

DEMODULATOR

+

NOISE FILTER

A

Semiconductor-

Based Isolation

Barrier

Transmitter

Receiver

Input

Logic

Gnd

VDD

VH

VL

Figure 2.1. Simplified Channel Diagram

A channel consists of an RF Transmitter and RF Receiver separated by a semiconductor-based isolation barrier. Referring to the

Transmitter, input A modulates the carrier provided by an RF oscillator using on/off keying. The Receiver contains a demodulator that

decodes the input state according to its RF energy content and applies the result to output B via the output driver. This RF on/off keying

scheme is superior to pulse code schemes as it provides best-in-class noise immunity, low power consumption, and better immunity to

magnetic fields.

Si8285/86 Data Sheet • Product Overview

Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com

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Rev. 2.0 • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • October 12, 2021

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