Part Number: PCM1794A
Other Parts Discussed in Thread: PCM1793
Hello,
We're currently designing a compact PCM1794A DAC board, and PCB space around the VCOML and VCOMR pins is quite limited.
The datasheet recommends 47 µF for each VCOM pin. Would it be acceptable to use a smaller capacitor, such as 1 µF to 2.2 µF?
In this previous discussion regarding the PCM1793, it was mentioned that the VCOM node is formed by two internal 15 k resistors in parallel, giving an equivalent resistance of approximately 7.5 k for the RC filter:
https://e2e.ti.com/support/audio-group/audio/f/audio-forum/957365/pcm1791a-vcom-capacitors?utm_source=chatgpt.com
Could you please advise whether the PCM1794A uses a similar internal resistor network? If so, what is the approximate equivalent resistance seen at each VCOML and VCOMR pin?
I would also appreciate any information regarding whether the main impact would be increased VCOM noise, reduced SNR, higher distortion, or possible stability issues.
Thank you very much for your help.