The DAC60501 was selected because the DAC has 12-bit resolution, can be powered using a 5V supply, and has a 0-5V output range with a 5V supply. The DAC7551 can be used in place of the DAC60501 if desired. Pin 1 of the XTR111 is connected to the +24V supply rail, and instead of using a separate 5V supply line for the DAC, this application uses the voltage regulator built in to the XTR111 configured for 5V using R₁ and R₂. In this case, R₁ is 2kΩ and R₂ is 3kΩ, resulting in a V_REGF of 5V. To improve the stability of the voltage regulator, C₂ needs to be 470nF or larger. In this application, a 470nF capacitor was selected. For more details on configuring the voltage regulator, see Section 6.3.6.

The error flag logic output (EF) is not used in this application and can be left unconnected. To keep the output of the XTR111 enabled, the output disable pin (OD) needs to be connected to GND. For additional information on the output disable and output error flag pins, see Section 6.3.5.

For a 5V full-scale input signal corresponding to an output current of 20mA, R_SET was set to 2.5kΩ.

To create the external current limit, the Infineon BSP170P and Onsemi MMBT2907A were chosen as the external transistors. For additional examples of P-Channel MOSFETs, see Table 6-1. To limit the current output of the IS pin, R₆ was set to 15Ω. R₇ and C₃ were added for additional output filtering. For more information on the external current limit and selecting external transistors, see Section 6.3.3.