SBAU382A November   2021  – January 2022 ADS7029-Q1 , ADS7039-Q1 , ADS7040 , ADS7041 , ADS7042 , ADS7043 , ADS7044 , ADS7046 , ADS7047 , ADS7049-Q1 , ADS7052 , ADS7054 , ADS7056 , ADS7057

 

  1.   Trademarks
  2. 1ADS704X-5XEVM-PDK Overview
  3. 2Introduction to the ADS704X-5XEVM
    1. 2.1 Analog Inputs
      1. 2.1.1 Single-Ended Input Path
      2. 2.1.2 Differential Input Path
    2. 2.2 Power Supplies
    3. 2.3 Digital Interface and Communication
    4. 2.4 I2C Bus for Onboard EEPROM
  4. 3ADS704X-5XEVM Software Installation
  5. 4EVM Operation
    1. 4.1 Connecting the Hardware
    2. 4.2 EVM GUI Global Settings for ADC Control
    3. 4.3 Time Domain Display
    4. 4.4 Spectral Analysis
    5. 4.5 Histogram Analysis
    6. 4.6 Updating EEPROM After ADC Replacement
  6. 5Bill of Materials, Layout, and Schematic
    1. 5.1 Bill of Materials
    2. 5.2 Layout
    3. 5.3 Schematic
  7. 6Revision History

4.4 Spectral Analysis

The Spectral Analysis tool shown in Figure 4-4 is intended to evaluate the dynamic performance (SNR, THD, SFDR, SINAD, and ENOB) of the 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 all ADCs included in Table 1-2. The None option corresponds to not using a window (or using a rectangular window) and is not recommended.

GUID-20211018-SS0I-HTLS-0DPW-TKMCCGCNP5TV-low.png Figure 4-4 Spectral Analysis in the ADS704X-5XEVM GUI
As noted in step 4.a in Section 4.1, Texas Instruments offers the PSIEVM as a precision signal generator if such a source is otherwise unavailable to the user. The PSIEVM can be used to generate clean sinusoidal input signals for the ADS704X-5XEVM to verify AC performance specifications.