SNLS577A April 2017  – October 2017 LMH0397


  1. 1Features
  2. 2Applications
  3. 3Description
  4. 4Revision History
  5. 5Description (continued)
  6. 6Device and Documentation Support
    1. 6.1Device Support
      1. 6.1.1Developmental Support
    2. 6.2Documentation Support
      1. 6.2.1Related Documentation
    3. 6.3Receiving Notification of Documentation Updates
    4. 6.4Community Resources
    5. 6.5Trademarks
    6. 6.6Electrostatic Discharge Caution
    7. 6.7Export Control Notice
    8. 6.8Glossary
  7. 7Mechanical, Packaging, and Orderable Information


  • 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 2.97 Gbps, 1.485 Gbps, or Divide-by-1.001 Subrates and 270 Mbps
  • On-Chip 75-Ω Termination and Return Loss Compensation Network
  • EQ (Equalizer) Mode:
    • Adaptive Cable Equalizer With Integrated Reclocker
    • 100-Ω Output Driver With De-Emphasis
    • Reclocked 75-Ω Loop-Through Output
    • EQ Mode Cable Reach
      (Belden 1694A, SDI_OUT Disabled):
      • 200 m at 2.97 Gbps
      • 300 m at 1.485 Gbps
      • 600 m at 270 Mbps
  • CD (Cable Driver) Mode:
    • Dual Differential Output Cable Drivers With Integrated Reclocker
    • Adaptive PCB Input Equalizer
    • Reclocked 100-Ω Loopback Output
  • Automatic Pre-Emphasis and Slew Rate Control on 75-Ω Outputs
  • Polarity Inversion on 75-Ω and 100-Ω Outputs
  • Automatic Power Save in Absence of Input Signal
    • Power Dissipation: 25 mW (Typical)
  • Power-Down Control Through ENABLE Pin
  • Single 2.5-V Supply
    • EQ Mode Power Dissipation: 275 mW (Typical)
    • CD Mode Power Dissipation: 290 mW (Typical)
  • Programmable Through Pins, SPI, or SMBus Interface
  • –40°C to +85°C Operating Temperature Range
  • 5-mm × 5-mm, 32-Pin WQFN Package
  • Pin Compatible with the LMH1297 for Easy Upgrade to 12G-SDI


  • SMPTE-Compatible Serial Digital Interface (SDI)
  • Broadcast Video Routers, Switchers, Distribution Amplifiers, and Monitors
  • IP Media Gateway
  • Digital Video Processing and Editing


The LMH0397 is a 3G-SDI 75-Ω bidirectional I/O with integrated reclocker. This device can be configured either in input mode as an adaptive cable equalizer or in output mode as a dual cable driver, allowing system designers the flexibility to use a single BNC either as an input or output port to simplify HD-SDI video hardware designs. The integrated reclocker locks to all supported SMPTE data rates up to 2.97 Gbps in both modes. The bidirectional I/O has an on-chip 75-Ω termination and return loss compensation network that meets the stringent SMPTE return loss requirements.

An additional 75-Ω driver output allows the LMH0397 to support a variety of system functions. In EQ (Equalizer) Mode, this second 75-Ω driver can be used as a loop-through output. In Cable Driver (CD) Mode, this 75-Ω driver can be used as a second fan-out cable driver. The host-side 100-Ω driver can also be used as a loopback output in CD Mode for monitoring purposes.

Device Information(1)

LMH0397WQFN (32)5.00 mm × 5.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Block Diagram

LMH0397 front_page_block_diagram_lmh1297_snls545.gif

Revision History

Changes from * Revision (April 2017) to A Revision

  • Changed typical power consumption in CD Mode from 315 mW to 290 mW based on updated characterization data Go
  • Added package drawings to the Mechanical, Packaging, and Orderable Information sectionGo