The recommended power-up sequence is to apply VCC first, followed by AVCC, and then DVCC. This ensures that the internal voltage regulators are powered up correctly.
To optimize ADC performance, ensure that the analog input signal is within the recommended range, use a low-pass filter to remove high-frequency noise, and adjust the ADC clock frequency to minimize jitter and noise.
The maximum allowed capacitance for the analog input pins is 10nF. Exceeding this value may affect the ADC's performance and accuracy.
The PCM1690DCAR outputs 24-bit data in I²S format. Ensure that your microcontroller or digital signal processor can handle this format and that you have implemented the necessary synchronization and data processing logic.
Keep analog and digital signals separate, use a ground plane to reduce noise, and route analog signals away from digital signals. Use a 4-layer PCB with a dedicated analog ground plane and a separate digital ground plane.
PCM1690DCAR datasheet
by Texas Instruments
