7.3.2 Isolation Channel Signal Transmission

As shown in OOK-Based Modulation Scheme, the AMC0x02R uses an on-off keying (OOK) modulation scheme

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

illustrated in the Functional Block Diagram . TX transmits an internally generated, high-frequency carrier across

the isolation barrier to represent a digital one. However, TX does not send a signal to represent a digital zero.

The nominal frequency of the carrier used inside the AMC0x02R is 480MHz.

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

the input to the analog filter. The AMC0x02R transmission channel is optimized to achieve the highest level of

common-mode transient immunity (CMTI) and the lowest level of radiated emissions. The high-frequency carrier

and RX/TX buffer switching cause these emissions.

Modulator Bitstream

on High-side

Internal Clock

Signal Across Isolation Barrier

Recovered Sigal

on Low-side

Figure 7-2. OOK-Based Modulation Scheme

AMC0202R, AMC0302R

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