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

Capacitive

Reinforced

Isolation

Barrier

20

AMC1311, AMC1311B

SBAS786 – DECEMBER 2017

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Feature Description (continued)

8.3.2 Isolation Channel Signal Transmission

The AMC1311 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream

with an internally-generated, high-frequency carrier across the isolation barrier to represent a digital one and

does not send a signal to represent the digital zero. The nominal frequency of the carrier used inside the

AMC1311 is 480 MHz.

The receiver demodulates the signal after advanced signal conditioning and produces the output. The AMC1311

also incorporates advanced circuit techniques to maximize the CMTI performance and minimize the radiated

emissions caused by the high-frequency carrier and IO buffer switching.

Figure 46. Block Diagram of an Isolation Channel

Figure 47 shows the concept of the OOK scheme.

Figure 47. OOK-Based Modulation Scheme