SBAU230C August   2014  – March 2021 ADS8688

 

  1. 1 Trademarks
  2. 2 ADS8688EVM-PDK Overview
  3. 3 EVM Analog Interface
    1. 3.1 ADC Analog Input Connections and Filter
    2. 3.2 Voltage Reference, Aux Input, and Supply Decoupling
  4. 4 Digital Interface
    1. 4.1 Serial Interface (SPI)
    2. 4.2 I2C Bus for Onboard EEPROM
  5. 5 Power Supplies
  6. 6 ADS8688 Initial Setup
    1. 6.1 Software Installation
  7. 7 EVM Operation
    1. 7.1 Connecting the Hardware
    2. 7.2 Modifying Hardware and Using Software to Evaluate Other Devices in the Family
    3. 7.3 EVM GUI Global Settings for ADC Control
    4. 7.4 Time Domain Display
    5. 7.5 Frequency Domain Display
    6. 7.6 Histogram Display
  8. 8 Bill of Materials, Schematics, and Layout
    1. 8.1 Bill of Materials
    2. 8.2 Board Layout
    3. 8.3 Schematic
  9. 10Revision History

3.1 ADC Analog Input Connections and Filter

The circuit shown in Figure 3-1 shows a typical analog input connection for the ADS8688 ADC. This circuit is reapeated eight times for all eight input channels. The resistor R01 can be used for input float detection but is not populated in the default configuration. The TVS diode D01, can be used for input protection, but is not populated. Refer to Video Series on Electrical Overstress. C01, R03, and R04 form the 79.5kHz low pass input the input filter for the ADC. R05 connects the negative input to ground. R05 can be removed and the negative input can be accessed in the header J6.

GUID-9DA01B8D-9430-49E5-A780-DE63FEA14E23-low.gifFigure 3-1 ADC Analog Input Connections and Filter