The SN75DP126 switches one Dual-Mode DisplayPort (DP++) input to one Dual-Mode
DisplayPort (DP++) sink output or one HDMI/DVI sink output. The HDMI/DVI output has a built-in
level translator compliant with DVI 1.0 and HDMI 1.4b standard TMDS signaling, and is specified up
to a maximum data rate of 3.4 Gbps, supporting resolutions greater than 1920 X 1440 and HDTV deep
color at 1080p. An integrated DP-HDMI Adaptor ID buffer can be accessed when the HDMI/DVI sink is
selected to indicate support for HDMI signaling.
The device compensates for PCB-related frequency loss and switching-related loss to
provide the optimum electrical performance from source to sink. The DP++ Main Link signal inputs
feature-configurable equalizers with selectable boost settings.
At the SN75DP126 DP++ Main Link output, four primary levels of differential output
voltage (VOD) swing and four primary levels of pre-emphasis are available as
well as a secondary level of boost adjustment, programmed through I2C,
for fine-tuning the Main Link output. The device can monitor the AUX channel and automatically
adjust output signaling levels and input equalizers based on DP Link Training commands.
The SN75DP126 offers separate AUX and DDC source interfaces that connect to the
DisplayPort AUX sink channel and the HDMI DDC sink channel, that seamlessly interface to graphics
processor (GPU) comprising separate DDC and AUX interfaces as well as GPUs with combined DDC/AUX.
Other sideband circuits such as Hot Plug Detect (HPD) are optimized to reduce external components
providing a seamless connection to Intel, AMD, and NVIDIA graphics processors.
The SN75DP126 is optimized for mobile applications, and contains activity-detection
circuitry on the DP++ Main Link input that transitions to a low-power Output Disable mode in the
absence of a valid input signal. Other low power modes are supported, including a Standby mode with
typical dissipation of ~2 mW when no video sink (for example, monitor) is connected.
The device is characterized for an extended operational temperature range from 0°C to
At the SN75DP126 HDMI/DVI output, the differential output voltage swing and pre-emphasis
levels are configurable. The SN75DP126 output signal conditioning and EQ parameters are
programmable through the I2C interface, the VSadj terminal, and the
I2C_CTL_EN terminal. The HDMI/DVI sink TMDS output slew rate is controlled by the SRC control
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