As a pioneer in digital video, Semtech’s Gennum Products continue to lead the way in proven UHD-SDI/12G, 3G, HD and SD technologies. Semtech continues its leadership in SDI technology by being first to market with an array of advanced UHD-SDI solutions. In fact, there’s a good chance that any TV broadcast or professional video passed through several Semtech components.

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12G UHD-SDI Cable Driver

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The GS12081 is a low-power, multi-rate, cable driver supporting rates up to 12G UHD-SDI. It is designed to receive 100Ω differential input signals, and transmit the signal over 75Ω coaxial cables. The 100Ω trace input supports up to 17dB of insertion loss.

The device supports SMPTE ST 2082-1 (12G UHD-SDI), ST 2081-1 (6G UHD-SDI), ST 424 (3G SDI), ST 292-1 (HD-SDI) and ST 259 (SD-SDI). In addition to standard SMPTE rates, the device also supports DVB-ASI at 270Mb/s, MADI at 125Mb/s, and 10GbE.

The two cable drivers have highly configurable pre-emphasis and swing controls to compensate for long trace and connector losses. Additionally, automatic and user selectable output slew rate control is provided for each cable driver output.


  • Dual non-inverted 75Ω cable interface with on-chip termination
  • SMPTE ST 2082-1, ST 2081-1, ST 424, ST 292-1 and ST 259 compliant input/output
  • Multi-standard operation from 1Mb/s to 11.88Gb/s
  • Cable driver features:
  • Wide swing control
  • Pre-emphasis to compensate for significant insertion loss between device output and BNC
  • Manual output slew rate control
  • Manual or automatic Mute or disable on LOS
  • Trace equalizer features:
  • Integrated 100Ω, differential input termination
  • Automatic power down on loss of signal
  • Adjustable carrier detect threshold
  • DC-coupling from 1.2V to 2.5V CML logic
  • Trace equalization to compensate for up to 15” FR4 at 11.88Gb/s
  • Input offset compensation

Additional Features:

  • Single 1.8V power supply for analog and digital core
  • 2.5V or 3.3V for cable driver output supply
  • GSPI serial control and monitoring interface
  • Four configurable GPIO pins for control or status monitoring
  • Wide operating temperature range: -40°C to +85°C
  • Small 6mm × 4mm 40-pin QFN
  • Pb-free/Halogen-free/RoHS and WEEE compliant package
  • Pin compatible with the GS12181, GS12182, GS12281, and GS3281

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