SI8400AB-A-ISR Silicon Laboratories Inc, SI8400AB-A-ISR Datasheet - Page 12
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SI8400AB-A-ISR
Manufacturer Part Number
SI8400AB-A-ISR
Description
IC ISOLATOR BIDIR I2C 2CH 8SOIC
Manufacturer
Silicon Laboratories Inc
Datasheet
1.SI8401AA-B-ISR.pdf
(34 pages)
Specifications of SI8400AB-A-ISR
Inputs - Side 1/side 2
2/2
Number Of Channels
4
Isolation Rating
2500Vrms
Voltage - Supply
3 V ~ 5.5 V
Data Rate
10Mbps
Output Type
Open Drain
Package / Case
8-SOIC (3.9mm Width)
Operating Temperature
-40°C ~ 125°C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Propagation Delay
-
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SI8400AB-A-ISR
Manufacturer:
SILICON LABS/芯科
Quantity:
20 000
Si840x
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 unidirectional Si84xx channel is
shown in Figure 5.
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 6 for more details.
12
A
Transmitter
OSCILLATOR
MODULATOR
Figure 5. Simplified Channel Diagram
RF
Figure 6. Modulation Scheme
Semiconductor-
Based Isolation
Rev. 1.3
Barrier
DEMODULATOR
Modulation Signal
Output Signal
Input Signal
Receiver
B