SBAU193E June   2011  – May 2021 ADS8568

 

  1.   Trademarks
  2. 1EVM Overview
    1. 1.1 ADS8568EVM-PDK Kit Features
    2. 1.2 ADS8568EVM Board Features
    3. 1.3 Related Documentation From Texas Instruments
  3. 2EVM Analog Interface
    1. 2.1 ADC Supply, Input, Voltage Reference, and Digital Connections
    2. 2.2 ADC Amplifier Drive
  4. 3Digital Interface
    1. 3.1 Parallel Interface
    2. 3.2 Serial Interface (SPI)
    3. 3.3 Connections to PHI connector
    4. 3.4 Static Signals for ADS8568
    5. 3.5 I2C Bus for Onboard EEPROM
  5. 4Power Supplies
    1. 4.1 Low Dropout Regulator
    2. 4.2 Power Connections and LED Indicators
  6. 5Installing ADS8568EVM Software
  7. 6ADS8568EVM Operation
    1. 6.1 Connecting the Hardware and Running the GUI
    2. 6.2 Jumper Settings for ADS8568EVM
    3. 6.3 EVM GUI Global Settings for ADC Control
    4. 6.4 Time Domain Display
    5. 6.5 Frequency Domain Display
    6. 6.6 Histogram Display
  8. 7Modifying Hardware and Using Software to Evaluate ADS8548 and ADS8528
  9.   A Bill of Materials, Layout, and Schematic
    1.     A.1 Bill of Materials
    2.     A.2 Layout
    3.     A.3 Schematic
  10.   B Revision History

6.2 Jumper Settings for ADS8568EVM

The amplifiers and reference can be configured with jumpers. The amplifier jumpers (JP1-JP8) determine if the amplifier is used or if an external signal is directly connected to the ADC input. JP9 is used to select either the internal reference option or external reference option. Take care to make sure that the GUI configuration for the device reference matches the setting of JP9. The GUI software starts up in the "internal" reference mode, so make sure the JP9 is in the "INT" position.

Table 6-1 Jumper Settings
Jumper Setting Default Function
JP1 to JP8 wAmp / Bypass wAmp These eight jumpers determine if the amplifier is used to buffer the inputs signals or if it is bypassed. Choosing wAmp will connect the amplifier between each SMA connector (J1 to J8) and the ADC input. The default amplifier configuration is inverting (Gain = -1V/V). The amplifier gain configuration can be adjusted by soldering and de-soldering different resistors. Choosing the Bypass configuration will connect the SMA connectors directly to the ADC input.
JP9 EXT / INT INT This jumper will select internal vs external mode on the voltage reference. Using internal mode will disconnect the external reference. Using external mode will connect the external REF6025 2.5 V reference to the ADC reference input. Take care to make sure that the GUI settings for the voltage reference match this jumpers setting.