SBAU351 April   2021

 

  1.   Trademarks
  2. 1EVM Overview
    1. 1.1 ADS127L11EVM Kit
    2. 1.2 ADS127L11EVM Board
    3. 1.3 ADS127L11EVM-PDK-GUI Unsupported Features
  3. 2EVM Analog Interface
    1. 2.1 EVM Analog Input Options
    2. 2.2 ADC Connections and Decoupling
    3. 2.3 ADC Input Drive Amplifiers
    4. 2.4 VCOM Buffer
    5. 2.5 Onboard Voltage Reference
    6. 2.6 External Voltage Reference
    7. 2.7 Clock Tree
  4. 3Digital Interface
    1. 3.1 Serial Interface (SPI)
    2. 3.2 I2C Bus for Onboard EEPROM
  5. 4Power Supplies
    1. 4.1 Power Connection and Configuration
    2. 4.2 Low Dropout Regulator (LDO)
  6. 5ADS127L11EVM Software Installation
  7. 6EVM Operation
    1. 6.1 Connecting the Hardware
    2. 6.2 Optional Connections to the EVM
    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. 7Bill of Materials, Schematics, and Layout
    1. 7.1 Bill of Materials
    2. 7.2 Board Layouts
    3. 7.3 Schematics
  9. 8References

2.1 EVM Analog Input Options

For best performance, differential analog input signals can be connected through the SMA connectors (J3 and J6). There is also a header, J4, that can be used to directly connect inputs for dc measurements, or where best ac performance is not needed. For single-ended inputs, header J4 can be used to connect AINN or AINP to GND using the supplied shunt. Then use either J3 or J6 as the single-ended input. The input driver circuit uses the THS4551 fully-differential amplifier in a unity-gain configuration with a single-pole RC filter at the output. Multiple passive components around the amplifier are intentionally left uninstalled to give users the flexibility to customize the input drive circuit for their specific application.

When differential inputs are connected to the SMA connectors (J3 and J6), make sure header J4 does not have any connection to pins 1 or 3. Only connect the included shunt to pin 2, and not between pins 1-2 or 1-3 for differential inputs.