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Si8238AD-D-IS Datasheet(PDF) 10 Page - Silicon Laboratories

Part # Si8238AD-D-IS
Description  0.5 and 4.0 Amp ISOdrivers (2.5 and 5 kVRMS)
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Manufacturer  SILABS [Silicon Laboratories]
Direct Link  http://www.silabs.com
Logo SILABS - Silicon Laboratories

Si8238AD-D-IS Datasheet(HTML) 10 Page - Silicon Laboratories

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2.2 Functional Description
The operation of an Si823x 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 Si823x channel is shown in the figure below.
RF OSCILLATOR
MODULATOR
DEMODULATOR
A
B
Semiconductor-
Based Isolation
Barrier
Transmitter
Receiver
Dead
time
control
0.5 to 4 A
peak
Gnd
VDD
Driver
Figure 2.4. 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 the figure below for more details.
Input Signal
Output Signal
Modulation Signal
Figure 2.5. Modulation Scheme
Si823x Data Sheet
System Overview
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Rev. 2.1.1 | 10


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