SLAU898A june   2023  – july 2023

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Setup
      1. 2.1.1 Electrostatic Discharge Caution
      2. 2.1.2 Power Configurations
      3. 2.1.3 Jumper Information
    2. 2.2 Hardware Description
      1. 2.2.1 Theory of Operation
        1. 2.2.1.1 Digital Interface
        2. 2.2.1.2 Analog
        3. 2.2.1.3 Proto Space
        4. 2.2.1.4 LED Biasing Sub Circuit
  9. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layout
    3. 3.3 Bill of Materials
  10. 4Additional Information
    1.     Trademarks
  11. 5Related Documentation from Texas Instruments

2.2.1.2 Analog

Most Smart DACs can either output a steady DC signal, a custom waveform or PWM. DIY EVM contains two different areas to measure performance of a DC signal output and an area to measure the performance of wave generation.

The analog sigmal testing area is always connected and has corresponding headers and test points on the board to be accessible using any lab equipment.

The waveform testing section is disconnected from the rest of the board. Place the following 0 Ohm resistors:

ResistorFunction
R13, R14DAC Channel 0
R15, R16DAC Channel 1
R17, R18DAC Channel 2
R19, R20DAC Channel 3

Each DAC channel is connected to a corresponding SMA connector on the board through the CHANNEL_X_FEEDBACK_SELECT header. Please refer to a table above for jumper configurations. If custom feedback signal is required, then disconnect the jumper, and connect feedback signal to the FBX pin of the header. Most smart DAC EVMS have 0 ohm resistor populated that connects feedback to the output. Make sure to disconnect those resistors before using these features.