SNLS336J October   2010  – November 2014 DS90UH925Q-Q1

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1  Absolute Maximum Ratings
    2. 6.2  Handling Ratings
    3. 6.3  Recommended Operating Conditions
    4. 6.4  Thermal Information
    5. 6.5  DC Electrical Characteristics
    6. 6.6  AC Electrical Characteristics
    7. 6.7  DC and AC Serial Control Bus Characteristics
    8. 6.8  Recommended Timing for Serial Control Bus
    9. 6.9  Switching Characteristics
    10. 6.10 Typical Charateristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  High Speed Forward Channel Data Transfer
      2. 7.3.2  Low Speed Back Channel Data Transfer
      3. 7.3.3  Backward Compatible Mode
      4. 7.3.4  Common Mode Filter Pin (CMF)
      5. 7.3.5  Video Control Signal Filter
      6. 7.3.6  Power Down (PDB)
      7. 7.3.7  Remote Auto Power Down Mode
      8. 7.3.8  LVCMOS VDDIO Option
      9. 7.3.9  Input PCLK Loss Detect
      10. 7.3.10 Serial Link Fault Detect
      11. 7.3.11 Pixel Clock Edge Select (RFB)
      12. 7.3.12 Low Frequency Optimization (LFMODE)
      13. 7.3.13 Interrupt Pin — Functional Description and Usage (INTB)
      14. 7.3.14 EMI Reduction Features
        1. 7.3.14.1 Input SSC Tolerance (SSCT)
        2. 7.3.14.2 GPIO[3:0] and GPO_REG[8:4]
          1. 7.3.14.2.1 GPIO[3:0] Enable Sequence
          2. 7.3.14.2.2 GPO_REG[8:4] Enable Sequence
        3. 7.3.14.3 I2S Transmitting
          1. 7.3.14.3.1 Secondary I2S Channel
        4. 7.3.14.4 HDCP
        5. 7.3.14.5 Built In Self Test (BIST)
          1. 7.3.14.5.1 BIST Configuration and Status
            1. 7.3.14.5.1.1 Sample BIST Sequence
          2. 7.3.14.5.2 Forward Channel and Back Channel Error Checking
        6. 7.3.14.6 Internal Pattern Generation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Configuration Select (MODE_SEL)
      2. 7.4.2 HDCP Repeater
      3. 7.4.3 Repeater Configuration
      4. 7.4.4 Repeater Connections
    5. 7.5 Programming
      1. 7.5.1 Serial Control Bus
    6. 7.6 Register Maps
  8. Applications and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  9. Power Supply Recommendations
    1. 9.1 Power Up Requirements and PDB Pin
    2. 9.2 CML Interconnect Guidelines
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Trademarks
    3. 11.3 Electrostatic Discharge Caution
    4. 11.4 Glossary
  12. 12Mechanical, 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

10 Layout

10.1 Layout Guidelines

Circuit board layout and stack-up for the FPD-Link III devices should be designed to provide low-noise power feed to the device. Good layout practice will also separate high frequency or high-level inputs and outputs to minimize unwanted stray noise pickup, feedback and interference. Power system performance may be greatly improved by using thin dielectrics (2 to 4 mils) for power / ground sandwiches. This arrangement provides plane capacitance for the PCB power system with low-inductance parasitics, which has proven especially effective at high frequencies, and makes the value and placement of external bypass capacitors less critical. External bypass capacitors should include both RF ceramic and tantalum electrolytic types. RF capacitors may use values in the range of 0.01 uF to 0.1 uF. Tantalum capacitors may be in the 2.2 uF to 10 uF range. Voltage rating of the tantalum capacitors should be at least 5X the power supply voltage being used.

Surface mount capacitors are recommended due to their smaller parasitics. When using multiple capacitors per supply pin, locate the smaller value closer to the pin. A large bulk capacitor is recommend at the point of power entry. This is typically in the 50uF to 100uF range and will smooth low frequency switching noise. It is recommended to connect power and ground pins directly to the power and ground planes with bypass capacitors connected to the plane with via on both ends of the capacitor. Connecting power or ground pins to an external bypass capacitor will increase the inductance of the path.

A small body size X7R chip capacitor, such as 0603 or 0402, is recommended for external bypass. Its small body size reduces the parasitic inductance of the capacitor. The user must pay attention to the resonance frequency of these external bypass capacitors, usually in the range of 20-30 MHz. To provide effective bypassing, multiple capacitors are often used to achieve low impedance between the supply rails over the frequency of interest. At high frequency, it is also a common practice to use two vias from power and ground pins to the planes, reducing the impedance at high frequency.

Some devices provide separate power and ground pins for different portions of the circuit. This is done to isolate switching noise effects between different sections of the circuit. Separate planes on the PCB are typically not required. Pin Description tables typically provide guidance on which circuit blocks are connected to which power pin pairs. In some cases, an external filter may be used to provide clean power to sensitive circuits such as PLLs.

Use at least a four layer board with a power and ground plane. Locate LVCMOS signals away from the CML lines to prevent coupling from the LVCMOS lines to the CML lines. Closely-coupled differential lines of 100 Ohms are typically recommended for CML interconnect. The closely coupled lines help to ensure that coupled noise will appear as common-mode and thus is rejected by the receivers. The tightly coupled lines will also radiate less.

Information on the WQFN style package is provided in TI Application Note: AN-1187 (SNOA401).

10.2 Layout Example

Stencil parameters such as aperture area ratio and the fabrication process have a significant impact on paste deposition. Inspection of the stencil prior to placement of the WQFN package is highly recommended to improve board assembly yields. If the via and aperture openings are not carefully monitored, the solder may flow unevenly through the DAP. Stencil parameters for aperture opening and via locations are shown below:

LLP_stencil_nopullback_explanation_diagram_snls302.pngFigure 27. No Pullback WQFN, Single Row Reference Diagram

Table 8. No Pullback WQFN Stencil Aperture Summary

Device Pin Count MKT Dwg PCB I/O Pad Size (mm) PCB Pitch (mm) PCB DAP size (mm) Stencil I/O Aperture (mm) Stencil DAP Aperture (mm) Number of DAP Aperture Openings Gap Between DAP Aperture (Dim A mm)
DS90UH925Q-Q1 48 SQA48A 0.25 x 0.6 0.5 5.1 x 5.1 0.25 x 0.7 1.1 x 1.1 16 0.2
sample_layout_DAP_snls302.pngFigure 28. 48-Pin WQFN Stencil Example of Via and Opening Placement

Figure 29 shows the PCB layout example derived from the layout design of the DS90UH925QSEVB Evaluation Board. The graphic and layout description are used to determine both proper routing and proper solder techniques when designing the Serializer board.

925_EVM_Layout.gifFigure 29. DS90UH925Q-Q1 Serializer Example Layout