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  • LMH12x9 12G UHD Long Reach Cable Equalizer with Integrated Reclocker

    • SNOSDC1A June   2024  – October 2024 LMH1229 , LMH1239

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  • LMH12x9 12G UHD Long Reach Cable Equalizer with Integrated Reclocker
  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements for Serial Management (SM) Bus Interface
    7. 5.7 Timing Requirements for Serial Parallel Interface (SPI) Interface
    8. 5.8 Typical Characteristics
      1. 5.8.1 TX Characteristics
      2. 5.8.2 RX Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 4-Level Input Pins and Thresholds
      2. 6.3.2 Input and Output Signal Flow Control
        1. 6.3.2.1 Input Mux Selection (LMH1239 Only)
        2. 6.3.2.2 Output Mux and SDI_OUT Selection
      3. 6.3.3 Input Carrier Detect
      4. 6.3.4 Adaptive Cable Equalizer (SDI_IN±, SDI_IN1±)
      5. 6.3.5 Clock and Data (CDR) Recovery
      6. 6.3.6 CDR Loop Bandwidth Control
      7. 6.3.7 Output Function Control
      8. 6.3.8 Output Driver Control
        1. 6.3.8.1 Line-Side 75Ω Output Cable Driver (SDI_OUT±)
          1. 6.3.8.1.1 Output Amplitude (VOD)
          2. 6.3.8.1.2 Output Pre-Emphasis
          3. 6.3.8.1.3 Output Slew Rate
          4. 6.3.8.1.4 Output Polarity Inversion
        2. 6.3.8.2 Host-Side 100Ω Output Driver (OUT0±, OUT1±)
      9. 6.3.9 Debug and Diagnostic Features
        1. 6.3.9.1 Internal Eye Opening Monitor (EOM)
        2. 6.3.9.2 PRBS Generator, Error Checker, and Error Injector
        3. 6.3.9.3 Status Indicators and Interrupts
          1. 6.3.9.3.1 LOCK_N (Lock Indicator)
          2. 6.3.9.3.2 CD_N (Carrier Detect)
          3. 6.3.9.3.3 Cable Fault Detection (SDI_OUT+ Only)
          4. 6.3.9.3.4 INT_N (Interrupt)
        4. 6.3.9.4 Additional Programmability
          1. 6.3.9.4.1 Cable EQ Index (CEI)
          2. 6.3.9.4.2 Digital MUTEREF
    4. 6.4 Device Functional Modes
      1. 6.4.1 System Management Bus (SMBus) Mode
        1. 6.4.1.1 SMBus Read and Write Transaction
          1. 6.4.1.1.1 SMBus Write Operation Format
          2. 6.4.1.1.2 SMBus Read Operation Format
      2. 6.4.2 Serial Peripheral Interface (SPI) Mode
        1. 6.4.2.1 SPI Read and Write Transactions
          1. 6.4.2.1.1 SPI Write Transaction Format
          2. 6.4.2.1.2 SPI Read Transaction Format
        2. 6.4.2.2 SPI Daisy Chain
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 SMPTE Requirements and Specifications
      2. 7.1.2 Optimizing the Time to Adapt and Lock
      3. 7.1.3 Optimized Loop Bandwidth Settings for Diagnostic or Cascade Applications
      4. 7.1.4 LMH1229 and LMH1297 (EQ Mode) Pin-to-Pin Compatibility
    2. 7.2 Typical Application
      1. 7.2.1 Cable Equalizer With Loop-Through
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
        3. 7.2.1.3 Application Curves
      2. 7.2.2 Cable Equalizer With Redundant SDI Input (LMH1239 only)
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Board Stack-Up and Ground References
        2. 7.4.1.2 High-Speed PCB Trace Routing and Coupling
          1. 7.4.1.2.1 SDI_IN± and SDI_OUT±:
          2. 7.4.1.2.2 OUT0± and OUT1±:
        3. 7.4.1.3 Anti-Pads
        4. 7.4.1.4 BNC Connector Layout and Routing
        5. 7.4.1.5 Power Supply and Ground Connections
        6. 7.4.1.6 Footprint Recommendations
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information
  12. IMPORTANT NOTICE

Package Options

Mechanical Data (Package|Pins)
  • RTV|32
    • MPQF166B
Thermal pad, mechanical data (Package|Pins)
  • RTV|32
    • QFND101J
Orderable Information
  • snosdc1a_oa
  • snosdc1a_pm
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Data Sheet

LMH12x9 12G UHD Long Reach Cable Equalizer with Integrated Reclocker

1 Features

  • Adaptive cable equalizer 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 referenceless reclocker locks to SMPTE rates: 11.88Gbps, 5.94Gbps, 2.97Gbps, 1.485Gbps, or divide-by-1.001 sub-rates, 270Mbps
  • Typical cable reach (Belden 1694A), PRBS-9 pattern:
    • 100m at 11.88Gbps (4Kp60 UHD)
    • 150m at 5.94Gbps (UHD)
    • 220m at 2.97Gbps (FHD)
    • 300m at 1.485Gbps (HD)
    • 600m at 270Mbps (SD)
  • Typical cable reach (Belden 1694A), pathological pattern(1):
    • 90m at 11.88Gbps (4Kp60 UHD)
    • 140m at 5.94Gbps (UHD)
    • 220m at 2.97Gbps (FHD)
    • 300m at 1.485Gbps (HD)
    • 600m at 270Mbps (SD)
  • On-chip 75Ω termination and return loss compensation network
  • Input cable equalizer and reclocker features:
    • Improved cable reach with stress patterns
    • Programmable CDR loop bandwidth settings
    • 2:1 75Ω input mux (LMH1239 only)
  • Output driver features:
    • 1:2 100Ω fanout output with de-emphasis
    • Reclocked 75Ω loop-through output with cable fault detection (up to 600m)
  • Built-in PRBS generator and checker
  • Internal eye opening monitor
  • Single 2.5V supply
  • Low power: 350mW (typical)
  • Power Save mode: 70mW
  • Configurable by control pins, SPI, or SMBus interface
  • 5mm × 5mm 32-pin WQFN package
  • Operating temperature range: –40°C to +85°C
1. For details about SDI pathological implementation, refer to A Study of the SDI Pathological Data Pattern application note

2 Applications

  • SMPTE compatible serial digital interface
  • UHDTV/4K/8K/HDTV/SDTV video
  • Broadcast video routers, switchers, distribution amplifiers, and monitors
  • Digital video processing and editing

3 Description

The LMH12x9 (LMH1229, LMH1239) is a long reach adaptive cable equalizer with integrated reclocker, dual outputs, and 75Ω loop-through output. The device is designed to equalize data transmitted over 75Ω coaxial cable and operates across SMPTE data rates ranging from 125Mbps to 11.88Gbps.

The adaptive equalizer at the SDI input enables automatic loss compensation for up to 100m Belden 1694A cable reach in 4K/8K video applications where 12G-SDI (11.88Gbps) is used. The integrated reclocker attenuates high frequency jitter and fully regenerates the data using a clean, low-jitter clock. The loop filter of the reclocker is adjustable with optional external capacitor to reduce the CDR loop bandwidth.

Device Information
PART NUMBER 2:1 75Ω INPUT MUX INCLUDED? PACKAGE(1) PACKAGE SIZE(2)
LMH1229 No RTV (QFN, 32) 5mm x 5mm
LMH1239 Yes
(1) For more information, see Section 10.
(2) The package size (length × width) is a nominal value and includes pins, where applicable.
LMH1229 LMH1239 Simplified Block Diagram Simplified Block Diagram

For routing simplicity and debug, the LMH12x9 features a 1:3 output mux consisting of two 100Ω fanouts with VOD and de-emphasis control and one 75Ω loop-through SDI output. The 75Ω loop-through output is provided to extend the signal reach or enable system-level diagnostics.

The LMH12x9 features internal integrated return loss networks that meet stringent SMPTE specifications across all data rates. The LMH12x9 also has an internal eye opening monitor and a programmable pin for CDR lock indication, input carrier detect, cable fault detection, or hardware interrupts to support system diagnostics and board bring-up.

The LMH1229 is pin compatible with the LMH1297 (12G UHD-SDI bidirectional I/O with integrated reclocker) when used in cable equalizer applications. For system-level redundancy, the LMH1239 is offered with an additional integrated SDI input mux.

 
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