Diodes Incorporated has launched a 3.3V four-channel hybrid redriver signal conditioner to enhance HDMI 2.1 signal quality and enable high-resolution video connections

Diodes Incorporated (Nasdaq: DIOD) has introduced two 3.3V quad-channel hybrid redriver signal conditioners with integrated Display Data Channel (DDC) monitors, designed to enhance signal integrity in HDMI applications and simplify system design. The PI3HDX12311 is suitable for high-bandwidth applications, supporting HDMI 2.1 fixed rate links (FRL) up to 12Gbps and minimised transmission differential signals (TMDS) up to 6Gbps. The PI3HDX6311 supports HDMI 2.0 at speeds up to 6Gbps. Both products also support DisplayPort Dual-Mode (DP++) V1.1 level shifting.

These two products act as intermediaries between the source (such as a CPU or GPU) and the power-receiving end (such as a display), compensating for signal attenuation along transmission lines. They are suitable for applications including laptops and desktops, docking stations, peripheral devices, gaming consoles, digital televisions (DTVs) and commercial display panels, as well as active HDMI cables.

Both products are hybrid devices capable of operating in either constrained or linear mode. For HDMI 1.4 applications, they function as constrained ReDriver signal conditioners, utilising swing-setting functionality to predefine differential output swing and ensure interface-end voltages comply with HDMI standards. For HDMI 2.0 and 2.1 applications, both devices function as linear ReDriver signal conditioners, where the output swing is proportional to the received signal, effectively eliminating signal distortion caused by routing. This linear mode is transparent to link training signals, while the PI3HDX12311 supports 8K DTV video resolution and data rates up to 48Gbps (12Gbps per channel).

Both devices support AC or DC coupling, or ACDC hybrid coupling for input and output signals; in DC coupling mode, they feature short-circuit detection. Both products employ pin configurations to control operating mode, equalisation, flat gain, output swing, and output -1dB linear swing. Additional features include automatic TX setting selection, IOFF support, and remote receiver detection.

To minimise power consumption, the PI3HDX12311 and PI3HDX6311 monitor the hot-plug detection (HPD) pin within the connector. When the HPD pin remains low for over 2 milliseconds, the device enters a low-power state. The DDC monitors in both devices similarly track the HDMI Forum Vendor-Specific Data Block (HF-VSDB) and the identical Status and Control Data Channel Structure (SCDCS) offset register.

The PI3HDX12311 and PI3HDX6311 utilise a compact 32-pin X1-QFN2845 package, occupying a PCB footprint of just 2.85mm x 4.5mm. They operate within a temperature range of -40°C to +70°C, with typical power consumption of 726mW.