SBAU493 October   2026

 

  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 Specification
    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 ADS125R14 EVM With an External Controller
  9. 3Software Installation and Hardware Connections
    1. 3.1 ADS125R14 EVM GUI Installation
    2. 3.2 ADS125R14 EVM Hardware Connections
  10. 4GUI Operation
    1. 4.1 GUI Navigation and Home Page
    2. 4.2 ADC Configuration
    3. 4.3 Register Settings
    4. 4.4 Analysis Page
      1. 4.4.1 Time-Domain Plot View
      2. 4.4.2 Frequency-Domain Plot View
  11. 5Hardware Design Files
    1. 5.1 Schematics
    2. 5.2 PCB Layouts
    3. 5.3 Bill of Materials (BOM)
  12. 6Additional Information
    1.     Trademarks
  13. 7References

2.7 Using the ADS125R14 EVM With an External Controller

The ADS125R14 EVM is designed to easily connect to an external controller. This design enables the user to test application code and firmware on the ADS125R14 without having to develop a custom PCB. This section describes the specific connections required to use the ADS125R14 EVM with an external controller. Figure 2-8 shows the location of various headers, connectors, and terminal blocks described in this section.


ADS125R14EVM-PDK Connecting an External Controller to the ADS125R14 EVM

Figure 2-8 Connecting an External Controller to the ADS125R14 EVM

Complete the following steps to prepare the ADS125R14 EVM for use with an external controller:

  1. Remove the PHI board if still connected to the EVM.
  2. Connect the external controller ground and bench supply ground to the GND pins on the EVM.
  3. Connect an external bench supply to the ADC AVDD pin by performing only one of the following two options:
    1. Remove the shunt on jumper JP11 and apply 5.5V to the "LDO IN" pin on jumper JP11.
    2. Remove the shunt on jumper JP12 and apply the AVDD voltage to the "AVDD" pin on jumper JP12.
  4. Connect an external bench supply to the ADC DVDD pin by removing the shunt on jumper JP1 and applying the DVDD voltage to the "DVDD" pin on jumper JP1.
  5. Apply digital communication signals to header J2 on the EVM:
    1. Connect POCI (peripheral out, controller in) from the controller to the DOUT pin.
    2. Connect PICO (peripheral in, controller out) from the controller to the DIN pin.
    3. Connect SCLK from the controller to the SCLK pin.
    4. Connect CS from the controller to the CS pin.
    5. Connect an I/O pin from the controller to the DRDY pin. DRDY is an output from the ADC that indicates when new data are ready to be clocked out of the ADC. Write a user-defined data collection routine that monitors this pin (polling or interrupt) and only transfers data after a falling edge.
    6. (Optional) Connect I/O pins from the controller to the SYNC/PWDN and RESET pins to control conversions and reset the device, respectively.
  6. (Optional) Connect an external Voltage Reference or Clock.
  7. Connect the signal source to the terminal blocks.

Verify that the external power supply voltages, communication signal levels, and applied input signals meet the specifications listed in Table 1-1.