SBAU431A July   2024  – 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 Performance Development Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1  EVM Analog Input Options
    2. 2.2  Common-Mode Amplifier
    3. 2.3  Analog Input Circuit
    4. 2.4  RTD Current Source
    5. 2.5  Voltage Reference
    6. 2.6  ADC Connections and Decoupling
    7. 2.7  Power Supplies
    8. 2.8  SYNC / Clock Divide Circuit
    9. 2.9  Clocking
    10. 2.10 Serial Interface
    11. 2.11 EEPROM
    12. 2.12 Using the ADS1282EVM With an External Controller
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 ADS1282 EVM Software Installation
  10. 4Implementation Results
    1. 4.1 EVM Operation
      1. 4.1.1 Evaluation Setup
      2. 4.1.2 EVM Register Settings
        1. 4.1.2.1 Channel Configuration
        2. 4.1.2.2 PGA Gain Selection
        3. 4.1.2.3 Data Rate Configuration
      3. 4.1.3 Time Domain Display
      4. 4.1.4 Spectral Analysis Display
      5. 4.1.5 Histogram Analysis Display
      6. 4.1.6 GUI Data Export
  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. 7Related Documentation
    1. 7.1 Supplemental Content
  14. 8Revision History

2.5 Voltage Reference

Figure 2-6 shows the REF54500 voltage reference circuit. By default, the REF54500 connects to the ADS1282 through 0Ω resistors R33, R34 and R41.

Use an external reference source in place of the REF54500 by removing resistors R34 and R41 and installing header J5. The positive terminal of the voltage reference connects to pin 2 on header J5, and the negative terminal to pin 1 on header J5. The pins of header J5 can also be used as test points for the onboard REF54500.

Install amplifier U4, OPA196, and remove resistor R33 to configure the ADS1282 EVM for ratiometric RTD measurements. This configuration uses amplifier U4 as a reference buffer with a nominal 1V level established by resistor R45. Refer to Figure 2-4 for more information.

ADS1282V2EVM-PDK Onboard Voltage ReferenceFigure 2-6 Onboard Voltage Reference