SBAU408 august   2023 ADS7953

 

  1.   1
  2.   ADS7953EVM-PDK Evaluation Module
  3.   Trademarks
  4. 1Overview
    1. 1.1 ADS7953EVM-PDK Features
    2. 1.2 ADS7953EVM Features
  5. 2Analog Interface
    1. 2.1 Connectors for Analog Inputs
    2. 2.2 ADC Input Signal Driver
      1. 2.2.1 Input Signal Path
  6. 3Digital Interfaces
    1. 3.1 SPI for the ADC Digital I/O
  7. 4Power Supplies
    1. 4.1 ADC Voltage Reference Configuration
  8. 5ADS7953EVM-PDK Initial Setup
    1. 5.1 Default Jumper Settings
    2. 5.2 EVM Graphical User Interface Software Installation
  9. 6ADS7953EVM-PDK Operation
    1. 6.1 EVM GUI Global Settings for ADC Control
    2. 6.2 Time Domain Display Tool
    3. 6.3 Spectral Analysis Tool
    4. 6.4 Histogram Analysis Tool
    5. 6.5 Device Configuration
    6. 6.6 Alarm Configuration
  10. 7Schematic, Bill of Materials, and Printed-Circuit Board Layout
    1. 7.1 Schematic
    2. 7.2 Bill of Materials
    3. 7.3 PCB Layout

2.2 ADC Input Signal Driver

The SAR ADC inputs terminate in switched-capacitor networks that create large instantaneous current loads when the switches are closed, which effectively makes the ADC inputs dynamically low impedance. The analog inputs of the ADC are therefore driven by an OPA192 used in a unity-gain buffer configuration to maintain ADC performance with maximum loading (1 MSPS) at full device throughput of the ADS7953.