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

3.4 Voltage Reference

The ADS1263 can accept an external reference in addition to the internal and supply reference options. The external reference inputs are shared with pins AIN0 through AIN5. See Table 3-1 to determine which pins correspond to RMUXP and RMUXN. ADC1 and ADC2 can share a reference source, though an independent reference source can be selected for ADC2.

Figure 3-12 shows that the ADS1263EVM also includes an optional external voltage reference circuit that is not installed by default.

GUID-20221111-SS0I-RKDV-ZJKQ-2KLCFTF6CLCB-low.svgFigure 3-12 ADS1263EVM External Voltage Reference Circuit (Optional)

The external reference circuit includes several resistors and capacitors that are not installed by default. A discrete voltage reference is also required. The recommended component is Texas Instruments' REF7025. This voltage reference offers very low noise, a very low temperature drift coefficient (2 ppm/°C), and high accuracy (±0.025%). Use the REF7025 with the ADS1263 in precision applications where performance is critical. The REF7025 output voltage is connected to analog inputs AIN0 and AIN1.