Sascha1 schrieb:
also optimal kann es nicht sein, denke ich mir jetzt einfach mal so. Dafür müsste das ein Elektroniker hier mal besser erklären.
Hier ein Auszug aus der Application Note:
"A typical PCB floor plan for the PCM1793 is shown in Figure 30. A ground plane is recommended, with the analog
and digital sections being isolated from one another using a split or cut in the circuit board. The PCM1793 must be
oriented with the digital I/O pins facing the ground plane split/cut to allow for short, direct connections to the digital
audio interface and control signals originating from the digital section of the board. Separate power supplies are
recommended for the digital and analog sections of the board. This prevents the switching noise present on the digital
supply from contaminating the analog power supply and
degrading the dynamic performance of the D/A converters.
In cases where a common 5-V supply would be used for the analog and digital sections, an inductance (RF choke,
ferrite bead) must be placed between the analog and digital 5-V supply connections to avoid coupling of the digital
switching noise into the analog circuitry. Figure 31 shows the recommended approach for single-supply applications."
Verschlechterung der dynamischen Entwicklung der D / A-Wandler.
mal von den Fremdstöreinflüßen abgesehen