SBAU434B November   2025  – April 2026 ADS125P08

 

  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 EVM Specifications
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Analog Inputs
    2. 2.2 ADC Connections and Decoupling
    3. 2.3 Digital Interface
    4. 2.4 Power Supplies
    5. 2.5 Voltage Reference
    6. 2.6 Clocking
    7. 2.7 Using the ADS125P08 EVM With an External Controller
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 ADS125P08 GUI Installation
  10. 4Implementation Results
    1. 4.1 Hardware Connections
    2. 4.2 GUI Operation
      1. 4.2.1 ADC Capture Settings and Sequencer Configuration
      2. 4.2.2 Time-Domain Display
      3. 4.2.3 Frequency-Domain Display
      4. 4.2.4 Histogram Display
      5. 4.2.5 EVM Register Settings
  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
  13. 7Revision History

2.5 Voltage Reference

Figure 2-5 shows an optional external voltage reference circuit included on the ADS125P08 EVM. The ADS125P08 integrates a low-noise, low-drift voltage reference that is sufficient for most applications. Alternatively, the EVM supports two external voltage reference options if desired. First, install header pin J11 and apply an external voltage source to this pin. Second, the EVM includes the 2.5V voltage reference REF6025 as well as the required passive components. However, these components are not included on the EVM by default and therefore must be installed by the user. Verify that any external reference voltage applied to the ADC meets the voltage requirements as described in Table 1-1. Additionally, the ADC registers need to be configured to use an external reference. See the ADC data sheet for more information.

ADS125P08EVM-PDK Optional External Reference Voltage CircuitFigure 2-5 Optional External Reference Voltage Circuit