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

2.2 Common-Mode Amplifier

Figure 3-2 shows the OPA379 op-amp circuit used to generate the common-mode voltage that the ADS1282 requires from the input signals. The circuit output, Vocm, provides a voltage that is mid-scale with respect to the selected input range of the ADS1282. In unipolar mode, Vocm is +2.5V relative to ground. In bipolar mode, Vocm is 0V relative to ground.

ADS1282V2EVM-PDK Common-Mode AmplifierFigure 2-2 Common-Mode Amplifier