SBAU433B November   2025  – April 2026 ADS125H18

 

  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 Specifications
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Analog Inputs
      1. 2.1.1 Differential Current Input Channels
      2. 2.1.2 Differential Voltage Inputs Channels
      3. 2.1.3 Combined Differential Current and Voltage Input Channels
      4. 2.1.4 Single-Ended Current Input Channels
    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 ADS125H18 EVM With an External Controller
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 ADS125H18 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

2.6 Clocking

Figure 2-9 shows an optional external clock connection on the ADS125H18 EVM using an SMA connector. The ADS125H18 integrates a high-accuracy oscillator that is sufficient for most applications. If necessary, the EVM includes component footprints to enable an external clock. By default, the SMA connector and series resistance are not installed, and therefore must be added to the EVM by the user. Verify that any external clock signal applied to the ADC meets the clocking requirements as described in Table 1-1. Additionally, configure the ADC registers as needed to use an external clock. Refer to the ADC datasheet for more information.

ADS125H18EVM-PDK Optional External Clock Connection Figure 2-9 Optional External Clock Connection