Equalizers
  • GS3440
    • Long-Reach Adaptive Cable Equalizer
  • GS3441
    • Long-Reach, Dual-Output Adaptive Cable Equalizer
  • GS1524A
    • Multi-Rate SDI Adaptive Cable Equalizer
  • GS1574A
    • Adaptive Cable Equalizer
  • GS1674
    • Adaptive Cable Equalizer
  • GS2964
    • Short Reach Adaptive Cable Equalizer
  • GS2974A
    • Adaptive Cable Equalizer
  • GS2984
    • Adaptive Cable Equalizer
Semtech GS2974B

Semtech GS2974B

Adaptive Cable Equalizer

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.

Features


  • 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
  • 50Ω differential output (internal 50Ω 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

Applications


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

Order Codes

Part No

Package

GS2974BCNE3

16 pin QFN