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

7.6 Histogram Display

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 7-8, the histogram corresponding to a DC input is displayed on clicking the Capture button.

GUID-20200901-CA0I-XLD0-XMN5-5CFSC2NHFHDM-low.gifFigure 7-8 Histogram Analysis Tool