SBAU435 February   2024 ADS127L18

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1  EVM Analog Input Options
    2. 2.2  Power Requirements
    3. 2.3  ADC Connections and Decoupling
    4. 2.4  ADC Input Amplifiers
    5. 2.5  VCOM Buffer
    6. 2.6  Voltage Reference
    7. 2.7  Reference Buffer
    8. 2.8  Clock Tree
    9. 2.9  Serial Interface
    10. 2.10 EEPROM
    11. 2.11 Power Supplies
    12. 2.12 Low Dropout Regulator (LDO)
  9. 3Software
    1. 3.1 Software Description
    2. 3.2 ADS127L18 EVM Software Installation
  10. 4Implementation Results
    1. 4.1 EVM Operation
      1. 4.1.1 Evaluation Setup
      2. 4.1.2 Optional EVM Connections
      3. 4.1.3 EVM Register Settings
      4. 4.1.4 ADC Capture Settings
        1. 4.1.4.1 ADC Configuration
        2. 4.1.4.2 Clocking Configuration
        3. 4.1.4.3 SPI and Data Port Configuration
        4. 4.1.4.4 Filter Configuration
        5. 4.1.4.5 Channel Configuration
      5. 4.1.5 Time Domain Display
      6. 4.1.6 Spectral Analysis Display
      7. 4.1.7 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

2.11 Power Supplies

Figure 3-11 shows the connection options for the external power supply that is required for normal EVM operation.

The EVM supports two different power configurations: unipolar, where the ADS127L18 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. Please refer to Section 2.2 for more details.

In unipolar operation mode, a single external supply voltage can be used. Either an external lab supply set to +6V can be connected to screw terminal J7, pin 1 (+6V) and pin 2 (GND), or an external power adapter can be connected to barrel connector J6.

In bipolar operation mode, a dual output lab supply must be used. The external lab supply must be set to +6V, -6V and connected to screw terminal J7, pin 1 (+6V), pin 2 (GND), and pin 3 (-6V).

GUID-20240108-SS0I-1KXB-TQR9-25DLPTG7D5WD-low.svgFigure 2-11 External Power Supply Connections