SBAU413A october   2022  – may 2023

 

  1.   Abstract
  2.   Trademarks
  3. 1EVM Overview
    1. 1.1 ADS131B26Q1EVM-PDK Features
    2. 1.2 ADS131B26Q1EVM-PDK Quick-Start Guide
  4. 2Analog Interface
    1. 2.1 Terminal Blocks and Test Points
    2. 2.2 ADC1A and ADC1B
    3. 2.3 ADC2A and ADC2B
    4. 2.4 ADC3A and ADC3B
  5. 3Digital Interface
    1. 3.1 Connection to the PHI Controller
    2. 3.2 Digital Header
    3. 3.3 Clock Options
  6. 4Power Supplies
    1. 4.1 DC/DC Converter Circuit
    2. 4.2 ADC Power Supplies
    3. 4.3 Power Supply and Voltage Reference Decoupling
  7. 5ADS131B26Q1EVM-PDK Initial Setup
    1. 5.1 Default Jumper Settings
    2. 5.2 EVM Graphical User Interface (GUI) Software Installation
  8. 6ADS131B26Q1EVM-PDK Software Reference
    1. 6.1 Global Settings for ADC Control
    2. 6.2 Register Map Configuration
      1. 6.2.1 Register Map Basics
      2. 6.2.2 ADC1A, ADC3A and ADC1B, ADC3B Configuration
      3. 6.2.3 ADC2A and ADC2B Configuration
    3. 6.3 Analysis Tools
      1. 6.3.1 Time Domain Display
      2. 6.3.2 Spectral Analysis Tool
      3. 6.3.3 Histogram Analysis
      4. 6.3.4 Sequencer Analysis
  9. 7ADS131B26Q1EVM-PDK Bill of Materials, PCB Layout, and Schematics
    1. 7.1 Bill of Materials (BOM)
    2. 7.2 PCB Layout
    3. 7.3 Schematics
  10. 8Revision History

2.3 ADC2A and ADC2B

The ADS131B26-Q1 features two multiplexed, 16-bit ADC channels that are intended to measure shunt temperature using external temperature sensors and other voltages in the system. For demonstration purposes, the EVM includes multiple resistor divider ratios to support unipolar and bipolar single-ended and pseudo-differential input measurements.

The V7A and V7B signals can serve as the common-mode voltage when measuring V5A and V6A or V5B and V6B, respectively. Alternatively, an external common-mode voltage can be generated from the analog supply voltage (ADC_AVDD) by installing the optional external VCM circuit shown in Figure 2-3. Figure 2-3 shows the input connections and resistor divider circuits for ADC2A.

GUID-20220921-SS0I-BFDH-PZSQ-2LLQNJBKWLVB-low.svgFigure 2-2 ADC2A Sequencer Input Circuits (Schematic)