SBAU431 July   2024 ADS1282

 

  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 Specifications
    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 1 Circuit
    4. 2.4  Analog Input 2 Amplifier
    5. 2.5  Voltage Reference
    6. 2.6  ADC Connections and Decoupling
    7. 2.7  Power Supplies
    8. 2.8  Low Dropout Regulators (LDO)
    9. 2.9  Flip-Flop/SYNC Circuit
    10. 2.10 Clocking
    11. 2.11 Serial Interface
    12. 2.12 EEPROM
  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
  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

2.5 Voltage Reference

Figure 3-5 shows the REF6050 voltage reference circuit. By default, the REF6050 connects to the ADS1282 through the 0Ω resistors R12 and R18. The REF6050 integrates a low output impedance buffer necessary for precision ADCs to maintain a steady reference voltage during the conversion process.

Use an external reference source in place of the REF6050 by removing R12 and R18, and installing header J4. The positive terminal of the voltage reference connects to header J4 pin 1, and the negative terminal to header J4 pin 2. The pins of header J4 can also be used as test points for the onboard REF6050. Use resistors R9 and R13 (not shown) as optional filter resistors when using an external voltage reference. Remove resistor R11 to disable the voltage output of the REF6050 voltage reference.

ADS1282V2EVM-PDK Onboard Voltage ReferenceFigure 2-5 Onboard Voltage Reference