SLVAFI8 February   2023 TLC6C5748-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Design Considerations for Low EMI
    1. 2.1 Design Considerations Overview
    2. 2.2 Considerations in Detail
      1. 2.2.1 Top-Level Architecture
      2. 2.2.2 High Frequency Signals
        1. 2.2.2.1  Original Setup
        2. 2.2.2.2  3.3 V I/O Voltage Instead of 5 V
        3. 2.2.2.3  Use Independent OSC for GSCLK With Spread Spectrum
        4. 2.2.2.4  Without Using Buffer on GSCLK
        5. 2.2.2.5  Using Snubber on GSCLK
        6. 2.2.2.6  Lower the Signal Frequency
        7. 2.2.2.7  Placement and PCB layout
        8. 2.2.2.8  ESD Enhancement
        9. 2.2.2.9  Demo and Test Results
        10. 2.2.2.10 Bench Test Results
  5. 3Summary
  6. 4References

2.2.2.1 Original Setup

Without using any EMC countermeasures, board design usually uses micro-controller to provide the TLC6C5748-Q1 desired signal, 5 V I/O voltage level and used buffer without RC snubber. #FIG_F2B_53L_FWB shows above setups test results in vertical direction from 45 MHz to 400 MHz with GMW3097 specification. In following test, we will measure the same frequency band to do the comparison

GUID-E7A89A43-DC37-4C94-999A-D171A53BC471-low.jpg Figure 2-3 Test Results of Original Setup (Vertical Direction) from 45 MHz to 439 MHz