8.1 Overview

The integrated PLL on the device provided adds the flexibility to remove the system clock (commonly known as master clock), allowing a 3-wire I²S connection and reducing system EMI. In addition, the PLL is completely programmable, allowing the device to become the I²S clock master and drive a DSP serial port as a slave. The PLL also accepts a non-standard clock (up to 50 MHz) as a source to generate the audio related clock (for example, 24.576 MHz).

Powersense undervoltage protection utilizes a two-level mute system. Upon clock error or system power failure, the device digitally attenuates the data (or last known good data) and then mutes the analog circuit.

Compared with existing DAC technology, the PCM512x devices offer up to 20 dB of lower out-of-band noise, reducing EMI and aliasing in downstream amplifiers/ADCs (from traditional 100-kHz OBN measurements to
3 MHz).

The PCM512x devices accept industry-standard audio data formats with 16-bit to 32-bit data. Sample rates up to 384 kHz are supported.