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LMH1297

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12G UHD-SDI bi-directional I/O with integrated reclocker

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Data sheet
12G UHD-SDI bi-directional I/O with integrated reclocker

LMH1297

ACTIVE
Data sheet Order now

Product details

Function Cable driver, Cable driver with reclocker, Config I/O, Equalizer, Equalizer with reclocker Power consumption (mW) 300 Data rate (Max) (Gbps) 11.88 Control interface Pin, SMBus, SPI Operating temperature range (C) -40 to 85
Function Cable driver, Cable driver with reclocker, Config I/O, Equalizer, Equalizer with reclocker Power consumption (mW) 300 Data rate (Max) (Gbps) 11.88 Control interface Pin, SMBus, SPI Operating temperature range (C) -40 to 85
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WQFN (RTV) 32 25 mm² 5 x 5
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  • User-configurable adaptive cable equalizer or cable driver with integrated reclocker
  • Supports ST-2082-1 (12G), ST-2081-1 (6G),
    ST-424 (3G), ST-292 (HD), and ST-259 (SD)
  • Compatible with DVB-ASI and AES10 (MADI)
  • Integrated reclocker locks to SMPTE rates of 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 sub-rates 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):
      • 75 m at 11.88 Gbps
      • 120 m at 5.94 Gbps
      • 200 m at 2.97 Gbps
      • 300 m at 1.485 Gbps
      • 600 m at 270 Mbps
  • Cable driver (CD) 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: 305 mW (Typical)
  • Programmable through pins, SPI, or SMBus interface
  • –40°C to +85°C operating temperature range
  • 5-mm × 5-mm, 32-Pin QFN package
  • User-configurable adaptive cable equalizer or cable driver with integrated reclocker
  • Supports ST-2082-1 (12G), ST-2081-1 (6G),
    ST-424 (3G), ST-292 (HD), and ST-259 (SD)
  • Compatible with DVB-ASI and AES10 (MADI)
  • Integrated reclocker locks to SMPTE rates of 11.88 Gbps, 5.94 Gbps, 2.97 Gbps, 1.485 Gbps, or divide-by-1.001 sub-rates 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):
      • 75 m at 11.88 Gbps
      • 120 m at 5.94 Gbps
      • 200 m at 2.97 Gbps
      • 300 m at 1.485 Gbps
      • 600 m at 270 Mbps
  • Cable driver (CD) 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: 305 mW (Typical)
  • Programmable through pins, SPI, or SMBus interface
  • –40°C to +85°C operating temperature range
  • 5-mm × 5-mm, 32-Pin QFN package
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The LMH1297 is a 12G UHD-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, simplifying UHD video hardware designs. The integrated reclocker locks to all supported SMPTE data rates up to 11.88 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 LMH1297 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 loop-back 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 LMH1297 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 LMH1297 is powered from a single 2.5-V supply. It is offered in a small 5-mm × 5-mm, 32-pin QFN package.

The LMH1297 is a 12G UHD-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, simplifying UHD video hardware designs. The integrated reclocker locks to all supported SMPTE data rates up to 11.88 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 LMH1297 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 loop-back 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 LMH1297 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 LMH1297 is powered from a single 2.5-V supply. It is offered in a small 5-mm × 5-mm, 32-pin QFN package.

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More Information

For more information on the LMH1297 programming guide and IBIS-AMI models.  Request Now

Technical documentation

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Type Title Date
* Data sheet LMH1297 12G UHD-SDI Bidirectional I/O With Integrated Reclocker datasheet (Rev. D) 12 May 2020
Application note LMH121x 12G SDI PCB Layout Guidelines 19 Feb 2020
User guide LMH1297EVM User's Guide (Rev. A) 07 Aug 2019
Application note LMH12xx MADI Compatibility Application Note 30 Aug 2018
Application note Simplifying 4K SDI Video Design with a Bidrectional I/O 31 Oct 2017
Technical article Three reasons why a bidirectional I/O will simplify your next 4K video design 06 Sep 2017

Design & development

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Evaluation board

LMH1297EVM — LMH1297 12-G bidirectional I/O evaluation module

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 (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

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 (...)
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WQFN (RTV) 32 View options

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