TX IN

Carrier Signal Across

the Isolation Barrier

RX OUT

TX IN

Oscillator

OOK

Modulation

Transmitter

TX Signal

Conditioning

Envelope

Detection

RX Signal

Conditioning

Receiver

RX OUT

SiO2-Based

Capacitive

Reinforced

Isolation

Barrier

24

AMC1306E05, AMC1306E25, AMC1306M05, AMC1306M25

SBAS734C – MARCH 2017 – REVISED JANAURY 2020

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Feature Description (continued)

8.3.3 Isolation Channel Signal Transmission

The AMC1306 device uses an on-off keying (OOK) modulation scheme to transmit the modulator output

bitstream across the capacitive SiO2-based isolation barrier. The transmitter modulates the bitstream at TX IN in

Figure 49 with an internally-generated, 480-MHz carrier across the isolation barrier to represent a digital one and

sends a no signal to represent the digital zero. The receiver demodulates the signal after advanced signal

conditioning and produces the output. The symmetrical design of each isolation channel improves the CMTI

performance and reduces the radiated emissions caused by the high-frequency carrier. The block diagram of an

isolation channel integrated in the AMC1306 is shown in Figure 49.

Figure 49. Block Diagram of an Isolation Channel

Figure 50 shows the concept of the on-off keying scheme.

Figure 50. OOK-Based Modulation Scheme