A high-quality, low-jitter clock source is recommended, such as a crystal oscillator or a clock generator IC. The clock source should be able to provide a stable clock signal with a frequency of 256fs or 512fs, where fs is the sampling frequency.
The PCM2903E can be configured for master mode or slave mode by setting the appropriate values for the M/S bit in the control register. In master mode, the PCM2903E generates the clock signal, while in slave mode, it receives the clock signal from an external source.
The maximum cable length for the I2S interface depends on the clock frequency and the signal quality. As a general rule, the cable length should be kept as short as possible to minimize signal degradation and noise pickup. A maximum cable length of 10 inches (25 cm) is recommended.
Clock domain crossing occurs when the PCM2903E receives a clock signal from a different clock domain than the one used by the digital audio interface. To handle clock domain crossing, use a clock domain crossing circuit or a FIFO buffer to synchronize the clock signals and ensure data integrity.
The recommended power-up sequence for the PCM2903E is to first apply power to the analog supply (AVDD), followed by the digital supply (DVDD), and then the clock signal. This sequence helps to ensure that the internal analog and digital circuits are properly initialized.
PCM2903E datasheet
by Texas Instruments
