SBAU230C August   2014  – March 2021 ADS8688

 

  1. 1 Trademarks
  2. 2 ADS8688EVM-PDK Overview
  3. 3 EVM Analog Interface
    1. 3.1 ADC Analog Input Connections and Filter
    2. 3.2 Voltage Reference, Aux Input, and Supply Decoupling
  4. 4 Digital Interface
    1. 4.1 Serial Interface (SPI)
    2. 4.2 I2C Bus for Onboard EEPROM
  5. 5 Power Supplies
  6. 6 ADS8688 Initial Setup
    1. 6.1 Software Installation
  7. 7 EVM Operation
    1. 7.1 Connecting the Hardware
    2. 7.2 Modifying Hardware and Using Software to Evaluate Other Devices in the Family
    3. 7.3 EVM GUI Global Settings for ADC Control
    4. 7.4 Time Domain Display
    5. 7.5 Frequency Domain Display
    6. 7.6 Histogram Display
  8. 8 Bill of Materials, Schematics, and Layout
    1. 8.1 Bill of Materials
    2. 8.2 Board Layout
    3. 8.3 Schematic
  9. 10Revision History

7.5 Frequency Domain Display

The spectral analysis tool, shown in Figure 7-7, is intended to evaluate the dynamic performance (SNR, THD, SFDR, SINAD, and ENOB) of the ADS8688 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 using a rectangular window) and is not recommended.

GUID-20200901-CA0I-LRBP-JBH2-R8WHBVT1PP4M-low.gifFigure 7-7 Spectral Analysis Tool