TIDUFF0 December   2025

 

  1.   1
  2.   Description
  3.   Resources
  4.   Features
  5.   Applications
  6.   6
  7. 1System Description
    1. 1.1 Key System Specifications
  8. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
    3. 2.3 Highlighted Products
      1. 2.3.1 AWR2188
      2. 2.3.2 DS90UB971S-Q1
      3. 2.3.3 MSPM0G3519-Q1
      4. 2.3.4 LM68635-Q1
      5. 2.3.5 LP8772x-Q1
      6. 2.3.6 TPS6285018A-Q1
      7. 2.3.7 CDC6C025000-Q1
  9. 3System Design Theory
    1. 3.1 Diagnostic and Monitoring Features
    2. 3.2 Power over Coax (PoC) Network
    3. 3.3 SPI and I2C Communication Interface
  10. 4Hardware, Software, Testing Requirements, and Test Results
    1. 4.1 Hardware Requirements
    2. 4.2 Software Requirements
    3. 4.3 Test Setup
      1. 4.3.1 Precautions
      2. 4.3.2 Data Capturing Approach
  11. 5Design and Documentation Support
    1. 5.1 Design Files
      1. 5.1.1 Schematics
      2. 5.1.2 BOM
      3. 5.1.3 PCB Layout Recommendations
        1. 5.1.3.1 Launch on Package (LOP Antenna)
        2. 5.1.3.2 Power over Coax (PoC)
        3. 5.1.3.3 PCB Layer Stackup
        4. 5.1.3.4 Board Photos
    2. 5.2 Tools and Software
    3. 5.3 Documentation Support
    4. 5.4 Support Resources
    5. 5.5 Trademarks
      1. 5.5.1 About the Author
  12. 6About the Author

3.2 Power over Coax (PoC) Network

The purpose of a Power over Coax network is to separate the high-speed data signal from the DC power signal. The high-speed signal content consists of a high-speed forward channel carrying video and control data to the deserializer and a lower speed back channel carrying control data to the serializer.

To design an appropriate PoC network, consider the frequency range that the network must be able to filter. The PoC network must effectively filter a frequency range from half the back-channel frequency to the forward channel frequency.

This reference design supports FPD-Link in synchronous and non-synchronous mode. The PoC filter needs to support the frequency range of 4.72MHz to 3.775GHz.

Table 3-1 PoC Filter Requirements
DESERIALIZERSERIALIZERMODEBC FREQUENCYFC FREQUENCYPOC FILTER FREQUENCY RANGE
DS90UB9724S-Q1DS90UB971S-Q1Synchronous47.19MHz3.775GHz23.59MHz to 3.775GHz
Non-Synchronous9.44MHz3.775GHz4.72MHz to 3.775GHz

The selected PoC Filter supports the frequency range of 5MHz to 4.2GHz with a current rating of up to 1000mA at a temperature rating of 115°C

Table 3-2 PoC Filter Component Selection
DESIGNATORDESCRIPTIONPART NUMBERVENDOR
L10

Inductor, 10μH

ADM45FDC-100MTDK
L11Inductor, 2.2μHADL3225VM-2R2M
L12
R1321kΩ
R133