SLAS831D March 2014 – March 2018 PCM1860 , PCM1861 , PCM1862 , PCM1863 , PCM1864 , PCM1865
PRODUCTION DATA.
Use the same plane for analog and digital grounds to avoid any potential voltage difference between these grounds. On the PCM186x EVM, maximum SNR performance is achieved by using a single ground plane, and making sure that the return currents for digital signals are not near the AGND pin or the input signals.
As shown in Figure 74, the pin layout of the PCM186x is partitioned into two sections: analog and digital. No digital return currents (for example, clocks) are generated in the analog circuitry, as long as the system is partitioned in such a way that digital signals are routed away from the analog sections.