SNLS530D April   2016  – June 2018 LMH1219

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Block Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Recommended SMBus Interface AC Timing Specifications
    7. 6.7 Serial Parallel Interface (SPI) AC Timing Specifications
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  4-Level Input Configuration Pins
      2. 7.3.2  Input Carrier Detect
      3. 7.3.3  -6 dB Splitter Mode Launch Amplitude for IN0
      4. 7.3.4  Continuous Time Linear Equalizer (CTLE)
        1. 7.3.4.1 Adaptive Cable Equalizer (IN0+)
        2. 7.3.4.2 Adaptive PCB Trace Equalizer (IN1±)
      5. 7.3.5  Input-Output Mux Selection
      6. 7.3.6  Clock and Data Recovery (CDR) Reclocker
      7. 7.3.7  Internal Eye Opening Monitor (EOM)
      8. 7.3.8  Output Function Control
      9. 7.3.9  Output Driver Amplitude and De-Emphasis Control
      10. 7.3.10 Status Indicators and Interrupts
        1. 7.3.10.1 LOCK_N (Lock Indicator)
        2. 7.3.10.2 CD_N (Carrier Detect)
        3. 7.3.10.3 INT_N (Interrupt)
      11. 7.3.11 Additional Programmability
        1. 7.3.11.1 Cable Length Indicator (CLI)
        2. 7.3.11.2 Digital MUTEREF
    4. 7.4 Device Functional Modes
      1. 7.4.1 System Management Bus (SMBus) Mode
        1. 7.4.1.1 SMBus Read and Write Transactions
          1. 7.4.1.1.1 SMBus Write Operation Format
          2. 7.4.1.1.2 SMBus Read Operation Format
      2. 7.4.2 Serial Peripheral Interface (SPI) Mode
        1. 7.4.2.1 SPI Read and Write Transactions
          1. 7.4.2.1.1 SPI Write Transaction Format
          2. 7.4.2.1.2 SPI Read Transaction Format
        2. 7.4.2.2 SPI Daisy Chain
    5. 7.5 LMH1219 Register Map
      1. 7.5.1 Share Register Page
      2. 7.5.2 CTLE/CDR Register Page
      3. 7.5.3 CableEQ/Drivers Register Page
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 General Guidance for SMPTE and 10 GbE Applications
      2. 8.1.2 Optimizing Time to Adapt and Lock
      3. 8.1.3 LMH1219 and LMH0324 Compatibility
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detail Design Procedure
      3. 8.2.3 Recommended VOD and DEM Register Settings
      4. 8.2.4 Application Performance Plots
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 PCB Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Receiving Notification of Documentation Updates
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

7.4.2.2 SPI Daisy Chain

The LMH1219 supports SPI daisy-chaining among multiple devices, as shown in Figure 20.

LMH1219 daisy_chain_configuration_snls475.gifFigure 20. Daisy-Chain Configuration

Each LMH1219 device is directly connected to the SCK and SS_N pins of the host. The first LMH1219 device in the chain is connected to the host’s MOSI pin, and the last device in the chain is connected to the host’s MISO pin. The MOSI pin of each intermediate LMH1219 device in the chain is connected to the MISO pin of the previous LMH1219 device, thereby creating a serial shift register. In a daisy-chain configuration of N x LMH1219 devices, the host conceptually sees a shift register of length 17 x N for a basic SPI transaction, during which SS_N is asserted low for 17 x N clock cycles.