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

2.1 Terminal Blocks and Test Points

Analog inputs to the EVM can be connected to either terminal block associated with each ADC channel. The screw terminal blocks (J1 through J5) can interface directly with the leads of an external source. Table 2-1 lists the supported input options. Table 2-2 lists key test points.

An input must not be applied such that the voltage on the input pins of the ADS131B26-Q1 exceeds the absolute maximum ratings. For more details, see the ADS131B26-Q1 data sheet.

Table 2-1 Analog Input Terminal Blocks (J1 - J5)
Terminal Block Pin Function Input Range ADS131B26-Q1 Input Pins
J1 1 Unipolar voltage input 0 V to 10 V (Gain = 1) V1A
2 Unipolar voltage input 0 V to 1.25 V (Gain = 1) V0A
3 Differential voltage, positive input or general-purpose digital input/output –10 V to 10 V (Gain = 4) VPA/GPIO0A
4 Differential voltage, negative input or general-purpose digital input/output Shorted to AGND (default) VNA/GPIO1A
5 Differential current, positive input 0 mA to 12.5 mA (Gain = 1) CPA
6 Differential current, negative input Shorted to AGND (default) CNA
J2 1 AGND － AGND, AGNDA, and AGNDB
2 AGND － AGND, AGNDA, and AGNDB
J3 1 Differential voltage, negative input or general-purpose digital input/output Shorted to AGND (default) VNB/GPIO1B
2 Differential voltage, positive input or general-purpose digital input/output –10 V to 10 V (Gain = 4) VPB/GPIO0B
3 Differential current, negative input Shorted to AGND (default) CNB
4 Differential current, positive input 0 mA to 12.5 mA (Gain = 1) CPB
5 Unipolar voltage input 0 V to 1.25 V (Gain = 1) V0B
6 Unipolar voltage input 0 V to 10 V (Gain = 1) V1B
J4 1 Unipolar voltage input 0 V to 10 V (Gain = 1) V2B
2 Unipolar voltage input –10 V to 10 V (Gain = 4) V3B
3 Unipolar voltage input –10 V to 10 V (Gain = 4) V4B
4 Unipolar voltage input –8.5 V to 10 V (Gain = 2) V5B
5 Unipolar voltage input –8.5 V to 10 V (Gain = 2) V6B
6 Unipolar voltage input V7B
J5 1 Unipolar voltage input V7A
2 Unipolar voltage input –8.5 V to 10 V (Gain = 2) V6A
3 Unipolar voltage input –8.5 V to 10 V (Gain = 2) V5A
4 Unipolar voltage input –10 V to 10 V (Gain = 4) V4A
5 Unipolar voltage input –10 V to 10 V (Gain = 4) V3A
6 Unipolar voltage input 0 V to 10 V (Gain = 1) V2A
Table 2-2 Key Voltage Test Points
Test Point Function Input Range ADS131B26-Q1 Input Pins
TP1 Probe VNA or GPIO0A –10 V to 10 V (Gain = 4) VPA/GPIO0A
TP2 Probe VPB or GPIO0B –10 V to 10 V (Gain = 4) VPB/GPIO0B
TP3 Ground clip for scope / multimeter － AGND, AGNDA, and AGNDB
TP4 Ground clip for scope / multimeter － AGND, AGNDA, and AGNDB
TP5 Probe VNA or GPIO1A Shorted to AGND (default) VNA/GPIO1A
TP6 Probe VNB or GPIO1B Shorted to AGND (default) VNB/GPIO1B