SBAU206B april   2015  – may 2023 ADS1262 , ADS1263

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1EVM Overview
    1. 1.1 ADS1263EVM Kit
    2. 1.2 ADS1263EVM Board
  5. 2Getting Started With the ADS1263EVM
  6. 3Analog Interface
    1. 3.1 Analog Input Options
      1. 3.1.1 ADS1263 Integrated Input Functions
        1. 3.1.1.1 ADC Inputs
        2. 3.1.1.2 IDAC Output
        3. 3.1.1.3 VBIAS Output
        4. 3.1.1.4 External Reference
        5. 3.1.1.5 Test DAC Output
        6. 3.1.1.6 GPIO
      2. 3.1.2 Analog Sensor Connections
        1. 3.1.2.1 Connecting a Thermocouple to J4 on the ADS1263EVM
        2. 3.1.2.2 Connecting a Thermistor to J3 on the ADS1263EVM
        3. 3.1.2.3 Using Thermistor RT1 for Thermocouple Cold-Junction Compensation
        4. 3.1.2.4 Connecting an RTD to J3 on the ADS1263EVM
          1. 3.1.2.4.1 Connecting a 2-Wire RTD
          2. 3.1.2.4.2 Connecting a 3-Wire RTD
          3. 3.1.2.4.3 Connecting a 4-Wire RTD
    2. 3.2 ADC Connections and Decoupling
    3. 3.3 Clocking
    4. 3.4 Voltage Reference
  7. 4Digital Interface
  8. 5Power Supplies
  9. 6Software Installation
  10. 7EVM Operation and GUI
    1. 7.1 Connecting the EVM Hardware
    2. 7.2 EVM GUI Global Settings for ADC Control
    3. 7.3 Time Domain Display
    4. 7.4 Frequency Domain Display
    5. 7.5 Histogram Display
    6. 7.6 Using the GUI to Control ADC2
  11. 8Bill of Materials, PCB Layout, and Schematics
    1. 8.1 Bill of Materials
    2. 8.2 PCB Layout
    3. 8.3 Schematics
  12. 9Revision History

3.1 Analog Input Options

The ADS1263 has a total of 11 analog input pins: AIN0 through AIN9 plus a common input, AINCOM. This design allows the ADS1263 to be configured for up to five differential input pairs, 10 single-ended inputs referenced to a common voltage, or a combination of single-ended and differential inputs. The flexible input multiplexer of the ADS1263 allows any two inputs to be selected for either the positive or negative ADC input.

Any AINx pin can be used as a common input when measuring single-ended signals. However, AINCOM is specifically designed to serve this purpose because AINCOM can provide a bias voltage (level-shift function). This voltage biases floating sensors to help meet the common-mode voltage requirements of the AD1263 PGA.

All ADC analog inputs are pinned out on the ADS1263EVM. The supporting circuitry provides filtering and ratiometric connections for a variety of sensors. Additionally, terminal block J4 can be used for thermocouple inputs (see Section 3.1.2.1). Terminal block J5 shows the connection and input filter for AINCOM. Figure 3-1 shows the schematic of the ADS1263EVM analog input circuitry.

GUID-20221111-SS0I-M0VT-TJZK-QBC3F42LKR47-low.svgFigure 3-1 ADS1263EVM Analog Input Channels and Filtering