Diodes rolls out 3.3-V hybrid ReDrivers for HDMI 2.1 signal integrity
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Diodes Incorporated has introduced two quad-channel hybrid ReDrivers targeting high-resolution video transmission over HDMI, aimed at addressing growing demands for bandwidth and signal clarity in today’s display systems. The PI3HDX12311 and PI3HDX6311 devices are designed to strengthen signal integrity in HDMI links while also reducing design complexity. For eeNews Europe readers, these devices present practical tools for developing high-speed digital video systems, offering flexibility across HDMI 1.4 through HDMI 2.1 specifications and applications ranging from consumer electronics to embedded display systems.
Support for HDMI 2.1 and legacy modes
According to Diodes, the PI3HDX12311 supports HDMI 2.1 fixed rate link (FRL) at up to 12 Gbps per channel, while the PI3HDX6311 is tailored for HDMI 2.0 at 6 Gbps. Both also support TMDS signaling and DisplayPort Dual-Mode (DP++) V1.1 level shifting. Acting as intermediaries between a source and sink, the ReDrivers restore degraded signals across transmission lines—crucial for maintaining integrity.
The hybrid design enables each device to operate in either limited or linear mode. In HDMI 1.4 scenarios, they operate as limited ReDrivers with pre-defined swing settings for compliance. For HDMI 2.0 and 2.1 applications, the ReDrivers switch to linear mode, effectively acting as trace cancellers that remain transparent to link training—a key requirement for modern high-bandwidth links.
With up to 48 Gbps aggregate data rate support, the PI3HDX12311 is well-positioned for 8K DTV and other ultra-high-definition applications, Diodes noted in the launch announcement.
Smart features and compact footprint
The PI3HDX12311 and PI3HDX6311 include a range of control features, including pin-strapping configuration for gain, equalization, output swing, and -1-dB linearity settings. They also offer AC/DC coupling flexibility, far-end receiver detection, IOFF support, and automatic transmitter (TX) settings selection. Diodes notes that power efficiency is addressed via integrated HPD monitoring: when the hot-plug-detect pin is low for more than 2ms, the device enters a low-power state. The integrated DDC listener also enhances system awareness by snooping HDMI Forum VSDB data and tracking SCDCS register changes.
The devices are housed in a 32-pin X1-QFN2845 package measuring 2.85 mm × 4.5 mm. They operate across a -40°C to +70°C range with typical power dissipation of 726 mW.
Pricing starts at $0.99 (PI3HDX12311) and $0.77 (PI3HDX6311) in 3,500-piece volumes. Both products are available now.
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