8.3.2 Isolation Channel Signal Transmission

The AMC1311 uses an on-off keying (OOK) modulation scheme, as shown in Figure 8-1, to transmit the

modulator output bitstream across the SiO2-based isolation barrier. The transmit driver (TX) shown in the

Functional Block Diagram transmits an internally-generated, high-frequency carrier across the isolation barrier

to represent a digital one and does not send a signal to represent a digital zero. The nominal frequency of the

carrier used inside the AMC1311 is 480 MHz.

The receiver (RX) on the other side of the isolation barrier recovers and demodulates the signal and provides

the input to the fourth-order analog filter. The AMC1311 transmission channel is optimized to achieve the

highest level of common-mode transient immunity (CMTI) and lowest level of radiated emissions caused by the

high-frequency carrier and RX/TX buffer switching.

Modulator Bitstream

on High-side

Internal Clock

Signal Across Isolation Barrier

Recovered Sigal

on Low-side

Figure 8-1. OOK-Based Modulation Scheme

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AMC1311

SBAS786C – DECEMBER 2017 – REVISED JUNE 2022

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