• GS12141
  • 12G UHD-SDI Retiming Adaptive Cable Equalizer
  • GS12090
  • Bidirectional 12G UHD-SDI Re-timing Adaptive Cable Equalizer/Cable Driver
  • GS3140
  • Low-power, Multi-Rate Adaptive 3G SDI Equalizer
  • GS6042
  • Long Reach Multi-rate 6G UHD-SDI Adaptive Cable Equalizer
  • GS3490
  • Configurable Multi-rate 3G Cable Driver and Adaptive Equalizer
  • GS3441
  • Long Reach, Dual Output, Multi-rate 3G Adaptive Cable Equalizer
  • GS3440
  • Long Reach, Multi-rate 3G Adaptive Cable Equalizer
  • GS2994
  • Multi-rate 3G Adaptive Cable Equalizer
Semtech GS2974B

Semtech GS2974B

Multi-rate Adaptive Cable Equalizer

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The GS2974B is a high-speed BiCMOS integrated circuit designed to equalize and restore signals received over 75ohm co-axial cable.

The GS2974B is designed to support SMPTE 424M, SMPTE 292M and SMPTE 259M, and is optimized for performance at 1.485Gb/s and 2.97Gb/s.

The GS2974B features DC restoration to compensate for the DC content of SMPTE pathological test patterns.

A voltage programmable mute threshold (MCLADJ), applicable for SD mode (refer to Section 4.3), is included to allow muting of the GS2974B output when an approximate selected cable length is reached for SMPTE 259M signals.

This feature allows the GS2974B to distinguish between low amplitude SD-SDI signals and noise at the input of the device. The serial digital outputs of the GS2974B may be forced to a mute state by applying a voltage to the MUTE pin.

Power consumption is typically 215mW using a 3.3V power supply. The GS2974B is lead-free, and the encapsulation compound does not contain halogenated flame retardant.

This component and all homogeneous subcomponents are RoHS compliant.


  • SMPTE 424M, SMPTE 292M, 344M and SMPTE 259M compliant
  • Automatic cable equalization
  • Multi-standard operation from 143Mb/s to 2.97Gb/s
  • Supports DVB-ASI at 270Mb/s
  • Small footprint (4mm x 4mm)
  • Pb-free and RoHS compliant
  • Manual bypass (useful for low data rates with slow rise/fall times)
  • Performance optimized for 1.485Gb/s and 2.97Gb/s
  • Typical equalized length of Belden 1694A cable: 140m at 2.97Gb/s, 230m at 1.485Gb/s, and 250m at 270Mb/s
  • 50? differential output (internal 50? pull-ups)
  • Programmable mute based on max cable length adjust
  • Single 3.3V power supply operation
  • Operating temperature range: 0°C to +70°C
  • Footprint compatible with GS2974A and GS1574A


  • SMPTE 424M, SMPTE 292M and SMPTE 259M Coaxial Cable Serial Digital Interfaces.

Order Codes

  • GS2974BCNTE3Z: Lead-Free, RoHS Compliant, Tape and Reel-2500 Pieces
  • GS2974BCNTE3: Lead-Free, RoHS Compliant, Tape and Reel-250 Pieces
  • GS2974BCNE3: Lead-Free, RoHS Compliant, Tray-490 Pieces
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