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
3.1.2.4.2 Connecting a 3-Wire RTD

Connect the two measurement leads of a 3-wire RTD to any of the following differential pairs on terminal block J3: AIN0 and AIN1, AIN2 and AIN3, or AIN6 and AIN7. Connect the remaining common lead to AIN4. Figure 3-8 shows an example where the 3-wire RTD is connected to differential pair AIN6 and AIN7. Two IDACs are used in this example, though this approach is not strictly necessary.

GUID-20221111-SS0I-LHSG-WPLZ-TGVJ4LNXPT0Q-low.svg Figure 3-8 3-Wire RTD Ratiometric Connection Example

In this configuration, connect external jumper wires between AIN7 (J3:8) to AINCOM (J5:1). An additional jumper wire is required between AIN6 (J3:7) to AIN3 (J3:4) if two IDACs are used. These jumper wires route the IDAC currents on AINCOM and AIN3 around the input filtering to prevent voltage drops in the input signal path. IDAC1 current flows across the RTD and then the combined current of IDAC1 and IDAC2 flows through R1. The ratiometric reference voltage is generated between AIN4 and AIN5. The IDAC currents are then routed to GND through resistor R2 when populated.