7.3.2 Isolation Channel Signal Transmission

The AMC1202 uses an on-off keying (OOK) modulation scheme, as shown in Figure 7-1, to transmit 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 AMC1202 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 4th-order analog filter. The AMC1202 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 7-1. OOK-Based Modulation Scheme

AMC1202

SBASAB8 – MAY 2021

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