Si8442BA-D-IU Silicon Laboratories Inc, Si8442BA-D-IU Datasheet - Page 18

• Manufacturer Part Number: Si8442BA-D-IU
• Description: Isolator Interface IC Quad Ch 1 kV Iso 150M 2/2
• Manufacturer: Silicon Laboratories Inc

Specifications of Si8442BA-D-IU

• Number Of Channels: 4
• Propagation Delay Time: 35 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Supply Current: 9 mA
• Power Dissipation: 275 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: QSOP-16
• Minimum Operating Temperature: - 40 C
• Lead Free Status / Rohs Status: Details

Si84x/5x QSOP
3. Application Information
3.1. 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
Figure 11.
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 12 for more details.
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A
Transmitter
OSCILLATOR
MODULATOR
Figure 11. Simplified Channel Diagram
RF
Figure 12. Modulation Scheme
Semiconductor-
Based Isolation
Rev. 0.1
Barrier
DEMODULATOR
Modulation Signal
Output Signal
Input Signal
Receiver
B