The DACx0502 provides a 3-wire serial peripheral interface (SPI). The connections can be made to a processor, as shown in Figure 75. Connect the SPI2C pin to ground either directly or through a pulldown resistor. Pull the RSTSEL pin low or high based on the desired output state at power-up. Use a pullup resistor on the SYNC signal so that the signal is high by default. Use termination resistors at the digital source so that the transmission line reflections are minimized. The source termination resistors also help in slowing down the rise and fall times of the digital signals, and in turn, help in minimizing the digital feedthrough of the DAC.