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Texas Instruments LMH0397 3G-SDI Bidirectional I/O

Texas Instruments LMH0397 3G-SDI Bidirectional I/O can be configured either in input mode as an adaptive cable equalizer or as a dual cable driver in output mode. This feature allows system designers to use a single BNC either as an input or output port to simplify HD-SDI video hardware designs. The included integrated reclocker locks to all supported SMPTE data rates up to 2.97Gbps in both modes. The bidirectional I/O has an on-chip 75Ω termination and return loss compensation network that meets the stringent SMPTE return loss requirements. An additional 75Ω driver output allows the LMH0397 to support a variety of system functions. In EQ (Equalizer) Mode, the second 75Ω driver can be used as a loop-through output. In CD (Cable Driver) Mode, the 75Ω driver can be used as a second fan-out cable driver. The host-side 100Ω driver can also be used as a loopback output in CD Mode for monitoring purposes.

Features

  • User-configurable adaptive cable equalizer or cable driver with integrated reclocker
  • Supports ST-424 (3G), ST-292 (HD), and ST-259 (SD)
  • Compatible with DVB-ASI and AES10 (MADI)
  • Integrated reclocker locks to SMPTE rates of 2.97Gbps, 1.485Gbps, or Divide-by-1.001 sub rates and 270Mbps
  • On-chip 75Ω termination and return loss compensation network
  • EQ (Equalizer) mode
    • Adaptive cable equalizer with integrated reclocker
    • 100Ω Output driver with de-emphasis
    • Reclocked 75Ω loop-through output
    • EQ Mode cable reach (Belden 1694A, SDI_OUT disabled)
      • 200m at 2.97Gbps
      • 300m at 1.485Gbps
      • 600m at 270Mbps
  • CD (Cable Driver) mode
    • Dual differential output cable drivers with integrated reclocker
    • Adaptive PCB input equalizer
    • Reclocked 100Ω loopback output
  • Automatic pre-emphasis and slew rate control on 75Ω outputs
  • Polarity inversion on 75Ω and 100Ω outputs
  • Automatic power saving in absence of input signal
    • 25mW (Typical) power dissipation
  • Power-down control through ENABLE pin
  • Single 2.5V supply
    • EQ Mode power dissipation of 275mW (typical)
    • CD Mode power dissipation of 290mW (typical)
  • Programmable through pins, SPI, or SMBus interface
  • –40°C to +85°C Operating temperature range
  • 5mm × 5mm, 32-Pin WQFN package
  • Pin compatible with the LMH1297 for easy upgrade to 12G-SDI

Applications

  • SMPTE-Compatible Serial Digital Interface (SDI)
  • Broadcast video routers, switchers, distribution amplifiers, and monitors
  • IP Media gateway
  • Digital video processing and editing

Simplified Block Diagram

Block Diagram - Texas Instruments LMH0397 3G-SDI Bidirectional I/O
Opublikowano: 2017-09-07 | Zaktualizowano: 2022-06-01