SBAU411 February   2023 ADS127L21

 

  1.   Abstract
  2.   Trademarks
  3. 1EVM Overview
    1. 1.1 ADS127L21 EVM Kit
    2. 1.2 ADS127L21EVM Board
    3. 1.3 ADS127L21EVM-PDK-GUI Unsupported Features
    4. 1.4 Related Documentation
  4. 2Analog Interface
    1. 2.1 EVM Analog Input Options
    2. 2.2 ADC Connections and Decoupling
    3. 2.3 ADC Input Drive Amplifiers
    4. 2.4 VCOM Buffer
    5. 2.5 Onboard Voltage Reference
    6. 2.6 External Voltage Reference
    7. 2.7 Clock Tree
  5. 3Digital Interface
    1. 3.1 Serial Interface
    2. 3.2 I2C bus for Onboard EEPROM
  6. 4Power Supplies
    1. 4.1 Power Connection and Configuration
    2. 4.2 Low Dropout Regulator (LDO)
  7. 5ADS127L21 EVM Software Installation
  8. 6EVM Operation
    1. 6.1 Connecting the Hardware
    2. 6.2 Optional EVM Connections
    3. 6.3 EVM GUI Global Settings for ADC Control
    4. 6.4 Time Domain Display
    5. 6.5 Frequency Domain Display
    6. 6.6 Histogram Display
    7. 6.7 Digital Filter Configuration
    8. 6.8 Digital Filter Response
  9. 7Bill of Materials, Schematics, and Layout
    1. 7.1 Bill of Materials
    2. 7.2 Schematics
    3. 7.3 Board Layout

6.8 Digital Filter Response

#GUID-1D7DB8D7-0785-4286-A5C2-A87F108D63B7 shows the user-programmed filter response. This frequency response includes all upstream filter stages in the ADS127L21. The filter response allows for a quick visual check of the desired filter.

There are several prebuilt filters available that can be downloaded to the ADS127L21. These prebuilt filter files can be used as a template for custom filter designs when using the EVM GUI to download to the ADS127L21. The prebuilt filters are copied to the C:\Users\Public\Documents\Texas Instruments\ADS127L21\Configuration Files\Coefficients\ directory when the EVM GUI is installed.

GUID-20230125-SS0I-ZVF4-XWJW-ZNTK8KCH3FRT-low.png Figure 6-9 Digital Filter Response