Product details


Function Cable driver, Cable driver with reclocker, Config I/O, Equalizer, Equalizer with reclocker Power consumption (mW) 300 Data rate (Max) (Gbps) 2.97 Control interface Pin, SMBus, SPI Operating temperature range (C) -40 to 85 open-in-new Find other Serial digital interface (SDI) ICs

Package | Pins | Size

WQFN (RTV) 32 25 mm² 5 x 5 open-in-new Find other Serial digital interface (SDI) ICs


  • 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

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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.

The on-chip reclocker attenuates high-frequency jitter and fully regenerates the data using a clean, low-jitter clock. The reclocker has a built-in loop filter and does not require any input reference clock. The LMH0397 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, or hardware interrupts to support system diagnostics and board bring-up.

The LMH0397 is powered from a single 2.5-V supply. The device is offered in a small 5-mm × 5-mm, 32-pin WQFN package. The LMH0397 is also pin-compatible with the LMH1297.

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More information

For more information on the LMH0397 programming guide and IBIS-AMI models.  Request now

Technical documentation

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Type Title Date
* Data sheet LMH0397 3G-SDI Bidirectional I/O With Integrated Reclocker datasheet (Rev. C) May 12, 2020
Application note LMH12xx MADI Compatibility Application Note Aug. 30, 2018
Application note Simplifying 4K SDI Video Design with a Bidrectional I/O Oct. 31, 2017
Technical article Three reasons why a bidirectional I/O will simplify your next 4K video design Sep. 06, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide
The LMH1297EVM is an evaluation module (EVM) designed for high-speed performance and functional evaluation of the Texas Instruments LMH1297 12-G UHD-SDI bidirectional I/O with integrated reclocker. With this kit, you can quickly evaluate the cable reach and output signal integrity supported (...)
  • User-configurable adaptive cable equalizer or cable driver with integrated reclocker
  • Supports ST-2082-1 (12 G), ST-2081-1 (6 G), ST-424 (3 G), ST-292 (HD), ST-259 (SD)
  • Integrated reclocker locks to SMPTE video rates of 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps or divide-by-1.001 Sub-Rates and 270 (...)

Design tools & simulation

PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

CAD/CAE symbols

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WQFN (RTV) 32 View options

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