SLAU879 December   2022

 

  1.    DAC63004WCSP-EVM
  2.   Trademarks
  3. 1Overview
    1. 1.1 Kit Contents
    2. 1.2 Related Documentation from Texas Instruments
  4. 2System Setup
    1. 2.1 Software Setup
      1. 2.1.1 Operating Systems
      2. 2.1.2 Software Installation
    2. 2.2 Hardware Setup
      1. 2.2.1 Electrostatic Discharge Caution
      2. 2.2.2 Power Configurations and Jumper Settings
      3. 2.2.3 Connecting the Hardware
  5. 3Detailed Description
    1. 3.1 Hardware Description
      1. 3.1.1 Theory of Operation
        1. 3.1.1.1 Signal Definitions
        2. 3.1.1.2 Optional Current Source Circuitry
    2. 3.2 Software Description
      1. 3.2.1 Starting the Software
      2. 3.2.2 Software Features
        1. 3.2.2.1 High Level Configuration Page
          1. 3.2.2.1.1 Basic DAC Subpage
          2. 3.2.2.1.2 Margining Subpage
          3. 3.2.2.1.3 Functions Generation Subpage
        2. 3.2.2.2 Low Level Configuration Page
  6. 4Schematic, PCB Layout, and Bill of Materials
    1. 4.1 Schematics
    2. 4.2 PCB Layout
    3. 4.3 Bill of Materials

3.1.1.2 Optional Current Source Circuitry

The DAC63004WCSP-EVM has optional, nonpopulated components that can be used to evaluate the DACx3004W with external FemtoFET MOSFETs for high current source applications in a small, 4 mm × 4 mm area.

Figure 3-2 shows the block diagram for the optional circuit. The DACx3004W is a four channel device, so there are up to four high current outputs available with the optional circuitry. 3-Ω RSET resistors are used in this example. This circuit can achieve a current of 200 mA when the DAC outputs are set to 0.6 V. The RSET resistors used in this example are size 0603 with a power rating of 0.33 W. Larger resistors can be used to achieve a higher power rating which allows for a higher current output.

Figure 3-2 DAC63004WCSP-EVM High Current Output Stage Block Diagram

Figure 3-3 is a snip of the 4-mm × 4-mm high current output stage layout. The layout consists of the DACx3004W, four FemtoFET MOSFETs, and four size-0603 resistors. The DAC63004WCSP-EVM has footprints for 0805 resistors that are not a part of the example layout so that larger resistors can also be evaluated with the DAC63004WCSP-EVM.

Figure 3-3 DAC63004WCSP-EVM Optional Current Source Circuit Layout
Remove R5, R6, R7, and R8 on the DAC63004WCSP-EVM to disconnect the DAC_OUTx and DAC_FBx pins before populating the optional components for the high current output stage.