The WM8955L can operate as a master or a slave, and includes an on-chip PLL. It can use most master clock frequencies commonly found in portable systems, including USB, GSM, CDMA or PDC clocks, or standard 256fs clock rates. Different audio sample rates such as 48kHz, 44.1kHz, 8kHz and many others are supported. The WM8955L operates on supply voltages from 1.8V up to 3.6V, although the digital core can operate on a separate supply down to 1.42V, saving power. Different sections of the chip can also be powered down under software control. The WM8955L is supplied in a very small and thin 5x5mm QFN package, ideal for use in hand-held and portable systems.