1.3.1 Ground Pin (GND)

For optimal noise and Power Supply Rejection Ratio (PSRR) performance, the GND pin of the LDO should be tied to an electrically “quiet” circuit ground. This will ensure optimal PSRR and noise performance. For applications that have switching or noisy inputs, tie the GND pin to the return of the output capacitor. Ground planes help lower the inductance and, as a result, reduce the effect of fast current transients.