SBAU352 June   2020 ADS131B04-Q1

 

  1.   ADS131B04-Q1 Evaluation Module
    1.     Trademarks
    2. 1 EVM Overview
      1. 1.1 ADS131B04-Q1EVM Kit
      2. 1.2 ADS131B04-Q1EVM Board
    3. 2 EVM Analog Interface
      1. 2.1 ADC Analog Input Signal Path
      2. 2.2 ADC External Clock (CLKIN) Options
    4. 3 Digital Interface
      1. 3.1 SPI Communication
      2. 3.2 Connection to the PHI
      3. 3.3 Digital Header
      4. 3.4 LaunchPad Connectors
    5. 4 Power Supplies
    6. 5 ADS131B04-Q1EVM Initial Setup
      1. 5.1 Default Jumper Settings
      2. 5.2 EVM Graphical User Interface (GUI) Software Installation
    7. 6 ADS131B04-Q1EVM Operation
      1. 6.1 EVM GUI Global Settings for ADC Control
      2. 6.2 Register Map Configuration Tool
      3. 6.3 Time Domain Display Tool
      4. 6.4 Spectral Analysis Tool
      5. 6.5 Histogram Tool
    8. 7 ADS131B04-Q1EVM Bill of Materials, PCB Layout, and Schematic
      1. 7.1 Bill of Materials
      2. 7.2 PCB Layout
      3. 7.3 Schematic

6.5 Histogram Tool

Noise degrades ADC resolution and the histogram tool can be used to estimate effective resolution, which is an indicator of the number of bits of ADC resolution losses resulting from noise generated by the various sources connected to the ADC when measuring a DC signal. The cumulative effect of noise coupling to the ADC output from sources such as the input drive circuits, the reference drive circuit, the ADC power supply, and the ADC itself is reflected in the standard deviation of the ADC output code histogram that is obtained by performing multiple conversions of a DC input applied to a given channel.

As shown in Figure 16, the histogram corresponding to a DC input is displayed on clicking the Capture button.

histo_sbau352.gifFigure 16. Histogram Analysis Tool