参数资料
型号: SI84XXCOM-RD
厂商: Silicon Laboratories Inc
文件页数: 17/30页
文件大小: 0K
描述: KIT EVAL FOR SI84XXCOM
标准包装: 1
主要目的: 接口,数字式隔离器
嵌入式:
已用 IC / 零件: Si8421AD,Si8421BB,Si8442AB
主要属性: DC 至 150 Mbps 数据传送
次要属性: I²C 接口
已供物品:
产品目录页面: 628 (CN2011-ZH PDF)
其它名称: 336-1930
Si8410/20/21
2. Functional Description
2.1. Theory of Operation
The operation of an Si84xx channel is analogous to that of an opto coupler, 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 Si84xx channel is shown in
Transmitter
RF
OSCILLATOR
Semiconductor-
Receiver
A
MODULATOR
Based Isolation
Barrier
DEMODULATOR
B
Figure 3. 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. See
Figure 4 for more details.
Input Signal
Modulation Signal
Output Signal
Figure 4. Modulation Scheme
Rev. 1.5
17
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