company blog about Lontium LT8641UX 6Gbps HDMI2.0 4 Inputs 1 Output Switch IC

Lontium LT8641UX 6Gbps HDMI2.0 4 Inputs 1 Output Switch IC

Shenzhen Mingjiada Electronics Co., Ltd, as a global leading electronic components supplier, is committed to providing customers with high-performance electronic components solutions. Long term supply Lontium LT8641UX 6Gbps HDMI2.0 4-input 1-output switcher IC.LT8641UX is a high performance video switcher chip designed for modern multimedia devices to meet the stringent requirements of 4K UHD video transmission.

LT8641UX Product Description
The LT8641UX HDMI2.0 Switch is a 4:1 switch that complies with HDMI2.0/1.4 specification, maximum 6Gbps high speed data rate, adaptive equalisation of RX inputs and pre-emphasis of TX outputs, support for long cable applications, and no on-board XTALs to save BOM cost.

The LT8641UX HDMI2.0 switch automatically detects cable loss and adaptively optimises equalisation settings.CDR clears input data for long cable and cascade applications.The LT8641UX supports RX termination resistor calibration to further improve signal integrity.

The LT8641UX supports HDMI2.0/1.4 compliant DDC/SCDC. The integrated DDC and HPD switches further reduce system manufacturing costs and simplify system board wiring. The product is available in a QFN128 14mmx 14mm package. The operating temperature range is -40°C to +85°C. The LT8641UX is available in a QFN128 14mmx 14mm package.

Key performance parameters of LT8641UX:
Signal compatibility: Fully compatible with HDMI 1.4/2.0 standard, supports DC/AC coupling signal input and output.
Transmission rate: supports up to 6Gbps data rate, ensuring lossless 4K@60Hz video transmission.
Integrated Functions: Built-in HPD (Hot Plug Detection) switch, DDC (Display Data Channel) switch and +5V power indicator switch.
Signal Enhancement: Integrated adaptive equaliser and pre-emphasis technology, support long distance cable transmission
Control interface: Support I2C bus control, easy for system integration
Jitter removal: Built-in phase-locked loop (PLL) circuitry to effectively remove input signal jitter.

The LT8641UX adopts a ‘crystal-less (XTAL)’ design, which not only reduces the overall BOM cost, but also simplifies the complexity of PCB layout, and the built-in RX termination resistor calibration function of the LT8641UX chip further improves the signal integrity, which is particularly suitable for long cable and cascade application scenarios.

LT8641UX Technical Advantages

Adaptive signal processing technology:
The LT8641UX chip adopts an intelligent adaptive equalisation algorithm, which can automatically detect cable loss and optimise the equalisation settings to ensure that the signal maintains high quality even after long-distance transmission. This feature is especially suitable for professional audio and video systems, such as studio equipment, large conference systems and other applications that require long-distance cabling.

System integration simplifies design:

The LT8641UX highly integrates several discrete components required by traditional HDMI switching systems, including:
DDC and HPD switching circuits
+5V power management circuitry
Signal buffer and driver circuits

This highly integrated design not only reduces system manufacturing costs, but also significantly simplifies PCB wiring and shortens product development cycles.

Low power consumption and thermal management:
Despite supporting high-speed data transmission of up to 6Gbps, the LT8641UX maintains excellent power consumption performance. Under typical operating conditions, the chip consumes 15-20% less power than similar products, effectively reducing system cooling requirements.

Compatibility and Expandability:
LT8641UX chip supports SCDC (State and Control Data Channel) protocol, fully compliant with HDMI2.0 specification requirements. At the same time, its flexible I2C control interface to facilitate system manufacturers to achieve functional expansion and customised development.

Typical application scenarios of LT8641UX
High-end TV and home theatre systems:
Buffering and switching of multiple HDMI inputs for smart TV front panels.
Signal routing and distribution for A/V receivers
Input selection system for 4K UHD projectors

Professional audio and video equipment:
Core components of a studio video switching matrix
Multi-source management for digital signage systems
Input and output control for video conferencing systems

Industrial and commercial display systems:
Signal processing front-end for large LED displays
Multi-content source switching for digital signage
Video wall control system for monitoring centre

Automotive infotainment systems:
Video distribution for in-car multi-screen interactive systems
Signal switching for rear entertainment systems
Display control for advanced driver assistance system (ADAS)