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

2.3 Analog Input 1 Circuit

Figure 3-3 shows the front-end circuit to ADC input channel 1. Vocm supplies a DC shift to the differential inputs connected to header J3. In unipolar mode, differential-output sources with a common-mode voltage equal to ground (0V) are given a +2.5V DC shift. The DC shift raises the input signal common-mode voltage by the same amount (2.5V), and the signal at the inputs to the ADS1282 has a common-mode voltage close to mid-scale of the unipolar input range (0-5V). The mid-scale common-mode voltage makes analog input channel 1 best for bipolar differential signals centered around a 0V common-mode voltage.

ADS1282V2EVM-PDK Analog Input 1 Circuit Figure 2-3 Analog Input 1 Circuit