SN75DP126 1:2 Switch with DisplayPort Re-Driver and TMDS Translator |

SN75DP126 (ACTIVE) 1:2 Switch with DisplayPort Re-Driver and TMDS Translator



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 85°C.

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 input.


  • One Dual-Mode DisplayPort™ (DP++) Input;
    Switchable to One DP++ Output or One TMDS
    Output Compatible with HDMI 1.4b and DVI
  • Supports DP v1.1a and DP v1.2 Signaling
    Including HBR2 Data Rates to 5.4 Gbps
  • Supports HDMI 1.4b with TMDS Clock
    Frequencies up to 340 MHz with 10 m Cable
  • Glue-less interface to AMD, Intel, and NVIDIA
    Graphics Processors
  • Auto-Configuration Through Link Training for
    DisplayPort Connection
  • Integrated DDC-Accessible DP-HDMI Adaptor ID
    for HDMI/DVI Sink Recognition
  • Output Signal Conditioning with Tunable Voltage
    Swing and Pre-Emphasis Gain for both
    DisplayPort and TMDS Outputs
  • Highly-Configurable Input-Variable Equalizer
  • Two Device Options Including a Dual Power-
    Supply Configuration for Lowest Power
  • 2-kV ESD HBM Protection
  • Temperature Range: 0°C to 85°C
  • 56-Pin 5-mm × 11-mm QFN Package


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Part number Order ESD HBM (kV) Protocols Speed (Max) (Gbps) Supply voltage (V) Number of TMDS outputs   Package Group Package size: mm2:W x L (PKG) Operating temperature range (C)
SN75DP126 Order now 2     HDMI     5.4     3.3     1     WQFN | 56     56WQFN: 55 mm2: 5 x 11 (WQFN | 56)     0 to 85    
SN65DP141 Order now 2     DisplayPort     12     2.5
0     WQFN | 38     38WQFN: 35 mm2: 5 x 7 (WQFN | 38)     -40 to 85    
SN75DP120 Order now 11     DisplayPort     2.7     3.3     0     VQFN | 36     36VQFN: 36 mm2: 6 x 6 (VQFN | 36)     0 to 85    
SN75DP122A Order now   HDMI     2.5     5     1     QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)     0 to 85    
SN75DP128A Samples not available 12     DisplayPort     2.7     5     0     QFN | 56     56QFN: 64 mm2: 8 x 8 (QFN | 56)     0 to 85    
SN75DP130 Order now 2     DisplayPort     5.4     3.3     0     VQFN | 48     48VQFN: 49 mm2: 7 x 7 (VQFN | 48)     0 to 85