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

3.3 Clocking

Figure 3-11 shows the different clocking options for the ADS1263EVM. The default configuration connects a 0-Ω resistor (R44) between the ADS1263 CLKIN pin and ground. Shorting CLKIN to ground automatically chooses the ADS1263 internal 7.3728-MHz oscillator to be the ADC clock source.

GUID-20221111-SS0I-QRPV-MZQ5-Q5KXR1D62XNX-low.svg Figure 3-11 ADS1263EVM External Voltage Reference Circuit (Optional)

An external clock can also be provided to the ADC. Figure 3-11 shows multiple ways to apply an external clock. First, an external 7.3728-MHz oscillator can be installed by using component Y1. The supply voltage for the recommended clocking component can be a maximum of 3.3 V and is tied to DVDD as a result. Review the data sheet parameters for any alternate components to confirm operation with these settings. See Section 5 if the selected clock requires a different DVDD voltage. In all cases, using an external clock at Y1 requires installing a 0-Ω resistor at R31 and removing R44.

The ADS1263EVM also offers the option of connecting an external clock using SMA connector J7. Choosing this clock option also requires installing a 0-Ω resistor at R37 and removing R44. However, neither of these external clock options are installed by default.