6.3.2 Data Isolation Channel Signal Transmission

The AMC3301 uses an on-off keying (OOK) modulation scheme, as shown in Figure 6-1, to transmit the

modulator output bitstream across the capacitive 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 AMC3301 is 480 MHz.

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

the output. The AMC3301 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 6-1. OOK-Based Modulation Scheme

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AMC3301

SBAS917C – AUGUST 2019 – REVISED MAY 2025

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