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

2.7 Power Supplies

By default, the PHI powers the ADS1282EVM circuitry from the computer power supply through USB without requiring an external power supply.

The EVM supports two different power configurations: unipolar, where the ADS1282 AVDD supply is set to 5V and AVSS is connected to GND; and bipolar operation, where AVDD is set to +2.5V and AVSS is set to -2.5V.

Unipolar operation mode does not require an external power supply, as the ADS1282EVM receives power for all the onboard circuitry directly from the PHI through USB.

Optionally, enable bipolar operation of the ADS1282EVM by using an external power supply. To do so, install header J6 and provide a voltage from -5V to -3V to pin 2 of header J6 (-VIN) while grounding pin 1 of header J6 (GND). Then, switch the shunt position on jumper JP1 to short pins 1-2 together.

Figure 3-7 shows the connection options for the external power supply that is required for bipolar EVM operation.

ADS1282V2EVM-PDK External Power Supply ConnectionFigure 2-7 External Power Supply Connection