Active switch optimised for signal integrity, power and cost

Diodes Incorporated has released the PI3HDX12221, an HDMI 2.1 active switch with linear ReDriver that empowers manufacturers of PCs, gaming consoles, TVs, and set-top boxes to adopt the latest 12Gbps HDMI standard. The device supports dual inputs with a signal cleaning function that allows extending channel lengths. Optimising function integration into a single package decreases system BOM and power consumption, particularly when compared to an equivalent discrete solution.

The device claims to the first HDMI 2.1 active switch with a non-blocking linear ReDriver. This non-blocking design provides a longer channel extension by transparently sending differential signals from the source to the receiver, facilitating the channel link training by host and end device.

Options such as automatic input signal detection assist in reducing system power by shifting into low power mode when no signal is possible. The four-channel differential design functions from a single 3.3V supply at data rates up to 12Gbps, and a maximum equaliser gain of +11dB for HDMI 2.1 at 6GHz, and +7dB for HDMI 2.0 at 3GHz.

Designing with the device is simplified due to the employment of pin-strapping to configure equalisation gains, flat gains and output swing linearity. Employing combinational logic control results in fewer control signals and, consequently, fewer pins, leading to a compact design. The device is offered in a 40-pin TQFN package measuring 3mm x 6mm, making it ideal for use in very small end applications.