SBAU489 June   2025 AMC23C15 , AMC3302

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Hardware Overview
    2. 2.2 Assembly Instructions
    3. 2.3 Interfaces
      1. 2.3.1 Analog Input
      2. 2.3.2 Digital Interface
    4. 2.4 Power Requirements
      1. 2.4.1 AVDD Input
      2. 2.4.2 DVDD Input
    5. 2.5 Test Points
    6. 2.6 Lug Information
    7. 2.7 Best Design Practices
  9. 3Implementation Results
    1. 3.1 Evaluation Procedure
      1. 3.1.1 Equipment Setup
      2. 3.1.2 Test Procedure
      3. 3.1.3 Full Signal Chain Evaluation Procedure
    2. 3.2 Performance Data and Results
      1. 3.2.1 Shunt Selection Calculations
      2. 3.2.2 Filter Selection
      3. 3.2.3 Thermal Results
  10. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks
  12. 6Related Documentation

3.2.2 Filter Selection

Figure 2-3 shows a diagram identifying three filters. Use these three circuit filters to adjust the AMC-MOD-50A-EVM performance. With each filter, there is a tradeoff between noise and propagation delay. The weaker the filter, the shorter the propagation delay.

AMC-MOD-50A-EVM AMC-MOD-50A-EVM Filter DiagramFigure 3-5 AMC-MOD-50A-EVM Filter Diagram

The following equation calculates the cutoff frequency for the input filter.

Equation 11. .    FC=12πRC=12π×32Ω×10nF=497kHz

Selecting a shunt resistor with high inductance when measuring a high frequency signal potentially causes overshoot in AC measurements. Overshoot caused by parasitic inductance is compensated for with proper design of the differential RC filter. Best input filter design is dependent on the inductance of the resistor and PCB design. Figure 3-6 shows an example simulation for TINA-TI.

AMC-MOD-50A-EVM Input Filter TINA-TIFigure 3-6 Input Filter TINA-TI

The following equation calculates the cutoff frequency for the DOUT and CLKIN filters. Modify as needed for bandwidth limitations.

Equation 12. .    FC=12πRC=12π×100Ω×30pF=53MHz