The UCC53x0 family of isolated gate drivers has three variations: split output, Miller clamp, and UVLO2 referenced to GND2 (see Device Comparison Table). The isolation inside the UCC53x0 family of devices is implemented with high-voltage SiO2-based capacitors. The signal across the isolation has an on-off keying (OOK) modulation scheme to transmit the digital data across a silicon dioxide based isolation barrier (see Figure 48). The transmitter sends a high-frequency carrier across the barrier to represent one digital state and sends no signal to represent the other digital state. The receiver demodulates the signal after advanced signal conditioning and produces the output through a buffer stage. The UCC53x0 devices also incorporate advanced circuit techniques to maximize the CMTI performance and minimize the radiated emissions from the high frequency carrier and IO buffer switching. The conceptual block diagram of a digital capacitive isolator, Figure 47, shows a functional block diagram of a typical channel. Figure 48 shows a conceptual detail of how the OOK scheme works.
Figure 47 shows how the input signal passes through the capacitive isolation barrier through modulation (OOK) and signal conditioning.