SBAS895B May 2018 – April 2020 AMC1300
The AMC1300 uses an on-off keying (OOK) modulation scheme to transmit the modulator output bitstream across the SiO2-based isolation barrier. As shown in Figure 47, the transmitter modulates the bitstream at TX IN 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 AMC1300 is 480 MHz.
The receiver demodulates the signal after advanced signal conditioning and produces the output. The AMC1300 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 48 shows the concept of the OOK scheme.