The recommended layout and routing for the PCM69AU involves keeping the analog and digital grounds separate, using a solid ground plane, and minimizing the length of the analog signal traces. It's also recommended to use a 4-layer PCB with a dedicated analog power plane and a dedicated digital power plane.
To optimize the performance of the PCM69AU in a noisy environment, use a low-pass filter on the analog input, use a shielded cable for the analog input, and consider using a common-mode filter on the analog input. Additionally, ensure that the power supply is well-regulated and decoupled.
The maximum clock frequency that can be used with the PCM69AU is 50 MHz. However, the actual clock frequency used may be limited by the specific application and the quality of the clock signal.
To ensure that the PCM69AU is properly powered and decoupled, use a high-quality power supply with low ripple and noise, and decouple the power pins with 0.1uF and 10uF capacitors. Additionally, use a 10uF capacitor on the analog power pin and a 10uF capacitor on the digital power pin.
The recommended method for programming the PCM69AU is to use a serial interface, such as SPI or I2C, to configure the device. The device can also be programmed using a parallel interface, but this is not recommended due to the complexity of the interface.
PCM69AU datasheet
by Texas Instruments
