SI8220BB-A-IS Silicon Laboratories Inc, SI8220BB-A-IS Datasheet - Page 12

• Manufacturer Part Number: SI8220BB-A-IS
• Description: IC ISODRIVER 2.5A OPTO INP 8SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI8220BB-A-IS

• Package / Case: 8-SOIC (3.9mm Width)
• Configuration: Isolated
• Input Type: Opto
• Delay Time: 50ns
• Current - Peak: 2.5A
• Number Of Configurations: 1
• Number Of Outputs: 2
• Voltage - Supply: 6.5 V ~ 24 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Mounting Style: SMD/SMT
• Number Of Channels: 1
• Propagation Delay Time: 50 ns
• Supply Voltage (max): 24 V
• Supply Voltage (min): 6.5 V
• Supply Current: 1.4 mA
• Power Dissipation: 1.2 W
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• High Side Voltage - Max (bootstrap): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Si8220/21
4. Application Information
4.1. Theory of Operation
The Si8220/21 is a functional upgrade for popular opto-isolated drivers, such as the Avago HPCL-3120, HPCL-
0302, Toshiba TLP350, and others. The operation of an Si8220/21 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 the Si8220/21 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
Emulator
LED
OSCILLATOR
MODULATOR
Figure 5. Simplified Channel Diagram
RF
Figure 6. Modulation Scheme
Semiconductor-
Based Isolation
Barrier
Rev. 1.0
DEMODULATOR
Receiver
Modulation Signal
Output Signal
Input Signal
Gnd
V
DD
0.5 to 2.5 A
peak
B