SLAU912 January   2024

 

  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 Power Requirements
    2. 2.2 Jumper Information
    3. 2.3 Setup
    4. 2.4 Test Points
    5. 2.5 High-Current Optional Stage
  9. 3Software
    1. 3.1 GUI Installation
    2. 3.2 Software Development
  10. 4Hardware Design Files
    1. 4.1 Schematics
    2. 4.2 PCB Layouts
    3. 4.3 Bill of Materials (BOM)
  11. 5Additional Information
    1. 5.1 Trademarks

2.5 High-Current Optional Stage

This output stage is designed to output high current (100-mA) for applications such as motor control. The design uses a class AB amplifier output with a diode-and-resistor-based constant current biasing.

Figure 5-3 shows the schematic of the stage.

GUID-20230914-SS0I-F0ZB-NGR7-B9DJ9L8LBTTW-low.svg Figure 2-1 DAC81404EVM High-current Output Stage Diagram

The power is disconnected to the high-current output stage by default. Refer to Table 3-4 for power connection information.

Table 2-4 DAC81404EVM High-Current Stage Headers
Header Name Function
J29 AVDD

ON

Short 1-2 – Connect AVDD to the high-current output stage.

Open – AVDD is disconnected from the high-current output stage (default).
J32 DAC

VOUT ON

Short 1-2 – Connect output of channel C of the DAC to the high-current output stage.

Short 2-3 – Connect the high-current output stage input to the ground.

Open – high-current output stage input is floating (default).
J35 AVSS ON

Short 1-2 – Connect AVSS to the system.

Open – AVSS is disconnected from the high-current output stage (default).
J27 LOAD

Short 1-2 – Connect high current output of the system to the on-board resistive load.

Open – The high current output stage is disconnected from the on-board resistive load (default).