SBAU251B July   2017  – February 2023 ADS8331 , ADS8332

 

  1.   ADS8332EVMV2-PDK User's Guide
  2.   Trademarks
  3. 1Overview
    1. 1.1 ADS8332EVMV2-PDK Features
    2. 1.2 ADS8332EVMV2 Features
  4. 2EVM Analog Interface
    1. 2.1 ADS8332EVMV2 Onboard Reference
  5. 3Digital Interfaces
    1. 3.1 ADS8332 Digital Interface
  6. 4Power Supplies
  7. 5ADS8332EVMV2-PDK Initial Setup
    1. 5.1 Default Jumper Settings
    2. 5.2 EVM Graphical User Interface (GUI) Software Installation
  8. 6ADS8332EVMV2-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 Tool
    5. 6.5 Linearity Analysis Tool
    6. 6.6 Input Amplifier Configurations
  9. 7Bill of Materials, PCB Layout, and Schematics
    1. 7.1 Bill of Materials
    2. 7.2 PCB Layout
    3. 7.3 Schematics
  10. 8Revision History

6.6 Input Amplifier Configurations

The ADS8332EVMV2 is designed so the user can configure the input amplifier in many different topologies. The EVM comes with the input as a unity gain buffer because this is applicable to the majority of SAR ADC designs. All eight of the input amplifiers have unpopulated components that allow for configurability.

Figure 6-9 shows three different input amplifier options for the ADS8332EVMV2. First, is the buffer configuration and this is how the EVM will initially be populated. Next, is an inverting configuration for when the dc offset of the input signal is zero. This topology will superimpose the input signal onto the voltage REF/2. Lastly, the bottom inverting configuration should be used for an input signal with the dc offset of VREF/2. This amplifier will maintain the dc offset of VREF/2.

The input amplifiers can be adjusted in many different ways to produce gains, filters, and a number of other functions. These input configurations are not tested and may require a higher bandwidth amplifier than what is populated on the ADS8332EVMV2.

Figure 6-9 Input Amplifier Configuration Examples