ZHCSIC8B April   2016  – June 2018 LMH0324

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化框图
  4. 4 修订历史记录
  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 Carrier Detect
      3. 7.3.3 Adaptive Cable Equalizer
      4. 7.3.4 Launch Amplitude
      5. 7.3.5 Input-Output Mux Selection
      6. 7.3.6 Output Function Control
      7. 7.3.7 Output Driver Amplitude and De-Emphasis Control
      8. 7.3.8 Additional Programmability
        1. 7.3.8.1 Cable Length Indicator (CLI)
        2. 7.3.8.2 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 LMH0324 Register Map
      1. 7.5.1 Share Register Page
      2. 7.5.2 CableEQ/Drivers Register Page
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 General Guidance for SMPTE Applications
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Recommended VOD and DE Register Settings
      4. 8.2.4 Application Performance Plots
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11器件和文档支持
    1. 11.1 接收文档更新通知
    2. 11.2 社区资源
    3. 11.3 商标
    4. 11.4 静电放电警告
    5. 11.5 术语表
  12. 12机械、封装和可订购信息

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • RTW|24
散热焊盘机械数据 (封装 | 引脚)
订购信息

7.3.7 Output Driver Amplitude and De-Emphasis Control

The VOD_DE control pin selects the output amplitude and de-emphasis settings for both OUT0± and OUT1±. It offers users the capability to select higher output amplitude and de-emphasis level for longer board trace that connects the drivers to their downstream receivers. Driver de-emphasis provides transmitter equalization to reduce the ISI caused by the board trace.

By default, the output driver VOD and de-emphasis settings are configured by the VOD_DE pin logic settings shown in Table 4. These settings can be overridden via register control. Through register programming, the output amplitude and de-emphasis level can be individually set for OUT0± and OUT1±. SPI and SMBus register programming provide a wider range of output amplitude and de-emphasis levels.

Table 4. Recommended VOD_DE Pin and Register Settings for Different FR4 Trace Lengths(1)

VOD_DE
LEVEL		 VOD REG SETTING
OUT0±: 0x30[5]=1, 0x30[2:0]
OUT1±: 0x32[5]=1, 0x32[2:0] 		DEM REG SETTING
OUT0±: 0x31[6]=1, 0x31[2:0]
OUT1±: 0x33[6]=1, 0x33[2:0] 		VOD (mVpp)(2) VODDE (mVpp)(2) DEM (dB) FR4 TRACE LENGTH (inches)
H 0 0 410 410 0 0 – 1
F 2 2 560 500 -0.9 2 – 4
R 3 3 635 480 -2.4 5 – 6
L 5 5 810 480 -6.1 7 – 8
(1) The output drivers are capable of providing higher VOD and DEM levels (max settings are 7). For more VOD and de-emphasis levels, refer to Table 9.
(2) See Figure 8.
LMH0324 snls475_vod_de_level.gifFigure 8. VOD and VODDE Levels
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