SBAU436B January   2024  – February 2025

 

  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 EVM Analog Input Options
      1. 2.1.1 Differential SMA Inputs
      2. 2.1.2 Single-Ended SMA Inputs
      3. 2.1.3 Differential Input Pins
    2. 2.2 Power Supplies
    3. 2.3 ADC Connections and Decoupling
    4. 2.4 ADC Input Amplifiers
    5. 2.5 VCOM Buffer
    6. 2.6 Voltage Reference
    7. 2.7 Clock Tree
    8. 2.8 Digital Interfaces
    9. 2.9 Using the ADS1278EVM With an External Controller
  9. 3Software
    1. 3.1 ADS1278EVM Software Installation
  10. 4Implementation Results
    1. 4.1 Hardware Connections
    2. 4.2 GUI Settings for ADC Control
    3. 4.3 Time Domain Display
    4. 4.4 Frequency Domain Display
    5. 4.5 Histogram Display
  11. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Additional Information
    1. 6.1 Trademarks
  13. 7References
  14. 8Revision History
  15. 9Revision History

4.4 Frequency Domain Display

The spectral analysis tool shown in Figure 4-4 is intended to evaluate the dynamic performance (SNR, THD, SFDR, SINAD, and ENOB) of the ADS1278 ADC through single-tone sinusoidal signal FFT analysis using the 7-term Blackman-Harris window setting. The FFT tool includes windowing options that are required to mitigate the effects of non-coherent sampling (this discussion is beyond the scope of this document). The 7-Term Blackman-Harris window is the default option and has sufficient dynamic range to resolve the frequency components of up to a 24-bit ADC. The None option corresponds to not using a window (or a rectangular window) and is not recommended.

ADS1278V2EVM-PDK Frequency Domain DisplayFigure 4-4 Frequency Domain Display