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PCM1798: Termination resistors

Part Number: PCM1798


I have a few quick questions. Are the termination resistors required for this DAC? In the datasheet (page 23, figure 34) it shows that for clock and data line termination they recommend 27 Ohm resistors (excl. master clock, which has a 10 Ohm termination resistor) are those really necessary? Or can I just leave them out? Is it based on track length? (I am using an ADAU1452 DSP as the data source)