SBAU353 October   2021

 

  1.   Trademarks
  2. 1EVM Overview
    1. 1.1 ADS131A04EVM Kit
    2. 1.2 ADS131A04EVM Board
  3. 2ADS131A04EVM Quick Start Guide
  4. 3EVM Analog Interface
    1. 3.1 ADC Analog Input Signal Path
    2. 3.2 ADC External Clock (XTAL1/CLKIN and XTAL2) Options
  5. 4Digital Interface
    1. 4.1 SPI Communication
    2. 4.2 Connection to the PHI
    3. 4.3 Digital Header
    4. 4.4 LaunchPad Connectors
  6. 5Power Supplies
  7. 6ADS131A04EVM Initial Setup
    1. 6.1 Default Jumper Settings
    2. 6.2 EVM Graphical User Interface (GUI) Software Installation
  8. 7ADS131A04EVM Software Reference
    1. 7.1 EVM GUI Global Settings for ADC Control
    2. 7.2 Register Map Configuration Tool
    3. 7.3 Time Domain Display Tool
    4. 7.4 Spectral Analysis Tool
    5. 7.5 Histogram Tool
  9. 8ADS131A04EVM Bill of Materials, PCB Layout, and Schematic
    1. 8.1 Bill of Materials
    2. 8.2 PCB Layout
    3. 8.3 Schematic
  10. 9References

7.4 Spectral Analysis Tool

The spectral analysis tool, shown in Figure 7-4, is intended to evaluate the dynamic performance (SNR, THD, SFDR, SINAD, and ENOB) of the ADS131A04 ADC through single-tone sinusoidal signal FFT analysis using the 7-term Blackman-Harris window setting.

GUID-20210924-SS0I-LWND-FKWT-HFFKQJ7GZGT1-low.jpgFigure 7-4 Spectral Analysis Tool

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 using a rectangular window) and is not recommended.