JAJSOZ7A August   2022  – April 2024 TMDS1204

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD and Latch-Up Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Timing Requirements
    7. 5.7 Switching Characteristics
    8. 5.8 Typical Characteristics
  7. 6 Parameter Measurement Information
  8. 7 Detailed Description
    1. 7.1 Functional Block Diagram
    2. 7.2 Feature Description
      1. 7.2.1  4-Level Inputs
      2. 7.2.2  I/O Voltage Level Selection
      3. 7.2.3  HPD_OUT
      4. 7.2.4  Lane Control
      5. 7.2.5  Swap
      6. 7.2.6  Linear and Limited Redriver
      7. 7.2.7  Main Link Inputs
      8. 7.2.8  Receiver Equalizer
      9. 7.2.9  CTLE Bypass
      10. 7.2.10 Adaptive Equalization in HDMI 2.1 FRL
        1. 7.2.10.1 HDMI 2.1 TX Compliance Testing with AEQ Enabled
      11. 7.2.11 HDMI 2.1 Link Training Compatible Rx EQ
      12. 7.2.12 Input Signal Detect
        1. 7.2.12.1 SIGDET_OUT Indicator
      13. 7.2.13 Main Link Outputs
        1. 7.2.13.1 Transmitter Bias
        2. 7.2.13.2 Transmitter Impedance Control
        3. 7.2.13.3 TX Slew Rate Control
        4. 7.2.13.4 TX Pre-Emphasis and De-Emphasis Control
        5. 7.2.13.5 TX Swing Control
        6. 7.2.13.6 Fan-out Buffer
      14. 7.2.14 HDMI DDC Capacitance
      15. 7.2.15 DisplayPort
    3. 7.3 Device Functional Modes
      1. 7.3.1 MODE Control
        1. 7.3.1.1 I2C Mode (MODE = "F")
        2. 7.3.1.2 Pin Strap Modes
          1. 7.3.1.2.1 Pin-Strap: HDMI 1.4 and HDMI 2.0 Functional Description
          2. 7.3.1.2.2 Pin-Strap HDMI 2.1 Function (MODE = "0"): Fixed Rx EQ)
          3. 7.3.1.2.3 Pin-Strap HDMI 2.1 Function (Mode = "1"): Flexible Rx EQ
          4. 7.3.1.2.4 Pin-Strap HDMI 2.1 Function (Mode = "R"): Flexible Rx EQ and Fan-Out Buffer
      2. 7.3.2 DDC Snoop Feature
        1. 7.3.2.1 HDMI Type
        2. 7.3.2.2 HDMI 2.1 FRL Snoop
      3. 7.3.3 Low Power States
    4. 7.4 Programming
      1. 7.4.1 Pseudocode Examples
        1. 7.4.1.1 HDMI 2.1 Source Example with DDC Snoop Disabled and DDC Buffer Disabled
        2. 7.4.1.2 Sink Example
      2. 7.4.2 TMDS1204 I2C Address Options
      3. 7.4.3 I2C Target Behavior
    5. 7.5 Register Maps
      1. 7.5.1 TMDS1204 Registers
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Source-Side Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Pre-Channel (LAB)
        2. 8.2.2.2 Post-Channel (LCD)
        3. 8.2.2.3 Common Mode Choke
        4. 8.2.2.4 ESD Protection
      3. 8.2.3 Application Curves
    3. 8.3 Typical Sink-Side Application
      1. 8.3.1 Design Requirements
      2. 8.3.2 Detailed Design Procedures
    4. 8.4 Power Supply Recommendations
      1. 8.4.1 Supply Decoupling
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
      2. 8.5.2 Layout Example
  10. 9 デバイスおよびドキュメントのサポート
    1. 9.1 ドキュメントのサポート
      1. 9.1.1 関連資料
    2. 9.2 ドキュメントの更新通知を受け取る方法
    3. 9.3 サポート・リソース
    4. 9.4 商標
    5. 9.5 静電気放電に関する注意事項
    6. 9.6 用語集
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.2.2.1 Pre-Channel (LAB)

The TMDS1204 can support up to 12dB at 6GHz of insertion loss. The loss profile between the GPU and the TMDS1204 input (referred to the pre-channel as shown in Figure 8-1) should be less than the TMDS1204 maximum receiver equalization. Figure 8-3 shows the loss profile of FR4 trace at different lengths. The TMDS1204 EQ0 and EQ1 pins should be configured to match the pre-channel insertion loss. Table 7-6 lists the EQ0 and EQ1 configuration options.

The GPU transmitter differential output voltage swing must be large enough so that the TMDS1204's VID(DC) and VID(EYE) requirements are met. The VID(EYE) is the eye height after the contribution of ISI jitter only. Because a redriver can only compensate for ISI jitter, all non-ISI sources of jitter (random, sinusoidal, and so forth) will be passed through TMDS1204. If the system designer requires the worse case channel length of 10 inches, then the GPU transmitter differential voltage swing without de-emphasis should be at least 1000mVpp to meet the VID(DC) and VID(EYE) requirements of the TMDS1204. A GPU transmitter, which incorporates de-emphasis, can meet the requirement with less than 1000mVpp.