SBAU427 July   2025 ADS131E08

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Device Information
    4. 1.4 Specification
  8. 2Hardware
    1. 2.1 EVM Analog Inputs
    2. 2.2 Power Supplies
    3. 2.3 ADC Connections and Decoupling
    4. 2.4 Voltage Reference
    5. 2.5 Op Amp Common-Mode Bias
    6. 2.6 Digital Interface
    7. 2.7 EEPROM
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 Software Installation
  10. 4Implementation Results
    1. 4.1 Hardware Connections
    2. 4.2 Optional EVM Configuration
    3. 4.3 GUI Software Operation
      1. 4.3.1 EVM Register Settings
      2. 4.3.2 GUI Settings for ADC Control
      3. 4.3.3 Time Domain Display
      4. 4.3.4 Frequency Domain Display
      5. 4.3.5 Histogram Display
  11. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Additional Information
    1. 6.1 Trademarks

2.4 Voltage Reference

The ADS131E08 has an integrated voltage reference that provides a 2.4V or 4V reference voltage to the device. Alternatively, power down the internal reference and apply an external reference voltage on the VREFP pin of JP3. Apply the voltage reference externally by installing JP3 and providing the externally generated reference through JP3. Figure 2-4 shows the EVM circuitry for an external voltage reference (U3) such as the REF6241. The external voltage reference must be installed by the user. Set the external reference voltage between 2V and AVDD, depending on the analog supply voltage.

ADS131E08EVM-PDK External Reference CircuitryFigure 2-4 External Reference Circuitry