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 R_SET 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 R_SET 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 3-3 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.

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.