PCM2707 Analogue Audio Out Confusion

wiredcharlie · 11th September 2010, 11:16 AM

I've been playing with a PCM2707, and I know from other threads that others on this board have too!

I've configured it as USB powered, because I figured there was less chance of blowing stuff up!

The thing I'm confused by is that I only get analogue audio out when FSEL (9) is tied high. According to the datasheet FSEL decides weather the data output is SPDIF (high) or I2S (low). Can anyone shed any light on this?

Tony

Noiseisgood · 13th September 2010, 05:46 AM

That means your DAC is working fine.

Its supposed to disable audio out when I2S output is enabled (because presumably you would want to use another better DAC for the actual digi-analog conversion if you were in I2S mode).

It says that somewhere in the datasheet...

wiredcharlie · 16th September 2010, 09:30 PM

...but that contradicts the example circuit on page 30 of the datasheet!

Mankysteve · 16th September 2010, 11:24 PM

There a set up configuration that lets you have both i2s and audio. I cant remember what pins but why worry about it you've got a working DAC

artur36 · 21st May 2012, 09:53 AM

Quote:

Originally Posted by wiredcharlie

I've been playing with a PCM2707, and I know from other threads that others on this board have too!

I've configured it as USB powered, because I figured there was less chance of blowing stuff up!

The thing I'm confused by is that I only get analogue audio out when FSEL (9) is tied high. According to the datasheet FSEL decides weather the data output is SPDIF (high) or I2S (low). Can anyone shed any light on this?

Tony

Hi was planning to have a pcm2707 chip outputting analogue line to an external amplifier, is this your setup? Can you please show me the schematics or the pcb design, so i can make one similar to you
Thanks

korben69 · 10:15 PM

Hi artur36
Have a look there :
The GrubDAC

You could use Analog output.
Easy and cheap

11th September 2010, 11:16 AM	#1
wiredcharlie diyAudio Member Join Date: Apr 2006 Location: Truro, Cornwall, UK	PCM2707 Analogue Audio Out Confusion I've been playing with a PCM2707, and I know from other threads that others on this board have too! I've configured it as USB powered, because I figured there was less chance of blowing stuff up! The thing I'm confused by is that I only get analogue audio out when FSEL (9) is tied high. According to the datasheet FSEL decides weather the data output is SPDIF (high) or I2S (low). Can anyone shed any light on this? Tony

22nd May 2012, 10:10 PM	#6
korben69 diyAudio Member Join Date: Nov 2006 Location: Near Lyon	Hi artur36 Have a look there : The GrubDAC You could use Analog output. Easy and cheap Last edited by korben69; 22nd May 2012 at 10:15 PM.

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13th September 2010, 05:46 AM	#2
Noiseisgood diyAudio Member Join Date: Mar 2009	That means your DAC is working fine. Its supposed to disable audio out when I2S output is enabled (because presumably you would want to use another better DAC for the actual digi-analog conversion if you were in I2S mode). It says that somewhere in the datasheet...

16th September 2010, 09:30 PM	#3
wiredcharlie diyAudio Member Join Date: Apr 2006 Location: Truro, Cornwall, UK	...but that contradicts the example circuit on page 30 of the datasheet!

16th September 2010, 11:24 PM	#4
Mankysteve diyAudio Member Join Date: Aug 2010	There a set up configuration that lets you have both i2s and audio. I cant remember what pins but why worry about it you've got a working DAC

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