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

2.2 ADC1A and ADC1B

The ADS131B26-Q1 features two high-precision, 24-bit ADC channels that are intended for battery current-shunt measurements (ADC1A and ADC1B). For demonstration purposes, the EVM includes a 100-Ω, 1206-footprint resistor on ADC1A and ADC1B to function as a current-shunt resistor (R8 and R9, respectively). A more realistic application uses a much smaller shunt resistor value (that is, 50 μΩ) that is not practical to include on the EVM hardware. A small current up to 12.5 mA at gain = 1 can be applied to the positive channel input (CPA and CPB), and the low-side of the shunt resistor is connected to AGND by default. Figure 2-3 shows the current input schematic for ADC1A.

GUID-20220921-SS0I-CM5T-ZRK2-GSKQFD86BZKR-low.svgFigure 2-1 ADC1A Current Input Circuit (Schematic)