Semtech GS12070 UHD-SDI Gearbox

Semtech GS12070 UHD-SDI Gearbox is a four-input and four-output device which supports conversions between multi-link, dual-link and single-link UHD-SDI interfaces. Semtech GS12070 supports conversions between the ST 425-3 and ST 425-5 multi-link 3Gb/s UHD-SDI Interface and the SMPTE ST 2081 (6Gb/s) and ST 2082 (12Gb/s) Interfaces. Conversion between 4 x 1.5Gb/s and 6Gb/s is also supported. The GS12070 features four high-speed differential signal inputs and four high-speed differential serial outputs which can be interfaced with 1.2V CML I/O. The high-speed inputs and outputs include programmable trace equalization and de-emphasis drivers to compensate for high-frequency losses associated with board-level interconnects.


  • Converts between 1.5G, 3G, 6G and 12G SDI
    • Quad link 3G-SDI ↔ 12Gb/s
    • Dual link 6Gb/s ↔ 12Gb/s
    • Dual link (2 x 3Gb/s) ST 425-3 ↔ 6Gb/s
    • Quad link (4 x 3Gb/s) ST 425-5/-6 ↔ Dual Link 6Gb/s
    • Quad link HD-SDI (4 x 1.5Gb/s) ↔ 6Gb/s
  • Serial bypass modes for all support rates
  • 4 Serial differential inputs
    • 100Ω differential inputs support DC-coupling to 1.2V CML Logic
    • Input trace equalization for up to 6" FR4 at 12Gb/s
  • Lead-free and RoHS-compliant package
  • 14mm x 14mm 256-ball BGA (0.8mm pitch)
  • 4 Serial differential outputs
    • 100Ω differential outputs support DC-coupling to 1.2V CML Logic
    • Output de-emphasis to compensate for up to 6" FR4 at 12Gb/s
  • Reference clock/crystal input — 148.5MHz/27MHz
  • GSPI serial control and monitoring interface
  • Selectable 1.8V and 2.5V digital control I/O
  • Automatic SMPTE ST 352 packet creation


  • Cameras
  • Monitors
  • Switchers


Block Diagram

Block Diagram - Semtech GS12070 UHD-SDI Gearbox
Published: 2017-08-28 | Updated: 2023-05-18