• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 394 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Some question about the output wavefrom in PCM1794A Digital Filter Bypass mode.

Ocean Chen
Prodigy 70 points
Other Parts Discussed in Thread: PCM1794A

Hi all:

I have two question about PCM1794A output waveform.

First, I have to use PCM1794A (Digital Filter Bypass Mode) to replace PCM1704 for my case.

Cause I have designed digital filter and that PCM1794A internal filter will crash my function, I have to use Digital Filter Bypass Mode.

I try to use MONO standard 24-b Mode, the performance must be grate!

So that I change the mode to Digital Filter Bypass Mode (MONO).

Start my controller, I find that only R-channel has differ voltage output.

Q1: Can I use L-channel in Digital Filter Bypass Mode?

Second. In the Digital Filter Bypass Mode, I saw a confusing waveform as below:

Vary serious noise can crash my performance.

There is a more interesting experiment.

I short the DATA(pin 5) ground. Saying in other word, put the DATA always 0x000000.

Finally, I got the waveform as blow figure.

I measure all OP section until I/V section. I found the problem should be generated by DA.

It has serious ripple, this incredible thing let me a headache.

Q2: Could you please tell me why and how to solve this problem?

Thank you vary much.

BR,

     Ocean