PCM2707 -> TAS3004 - I2S doubt

zumba · 10th June 2007, 12:12 PM

Hello,

I'm new to this forum, and I've searched for a similar threads but I did not find any answer to my question.

My project will have a PCM2707 as interface from USB and a TAS3004 for audio signal processing and a AD1954 as DAC.
The TAS3004 will also be used to switch to other input devices.

I've checked the datasheets and between them all the only component that does not accept to be a slave device is the PCM2707, wich means that this device will have to be the Master for the whole board, and this brings me to ask:

Does anyone know if the PCM2707 pin BCK (aka MCLK) stays always active, even if there is no streaming from the PC or the USB is not connected?

I would really be a pain to have to use an extra clock when the USB is detached or not active.

Can anyone please check with a scope on there own circuit if this pin stays active all the time?

Thank you that would be very appreciated

Cheers

Zumba

zumba · 10th June 2007, 12:35 PM

I've just noticed a mistake in my thread, I'm refering incorrectly to BCK pin, I instead mean pin SYSCK.

analog_sa · 10th June 2007, 02:11 PM

MCLK runs at all times

zumba · 10th June 2007, 08:33 PM

Thank you, that saves me quite a bit of sleepless nights!

10th June 2007, 12:12 PM	#1
zumba diyAudio Member Join Date: Jun 2007	PCM2707 -> TAS3004 - I2S doubt Hello, I'm new to this forum, and I've searched for a similar threads but I did not find any answer to my question. My project will have a PCM2707 as interface from USB and a TAS3004 for audio signal processing and a AD1954 as DAC. The TAS3004 will also be used to switch to other input devices. I've checked the datasheets and between them all the only component that does not accept to be a slave device is the PCM2707, wich means that this device will have to be the Master for the whole board, and this brings me to ask: Does anyone know if the PCM2707 pin BCK (aka MCLK) stays always active, even if there is no streaming from the PC or the USB is not connected? I would really be a pain to have to use an extra clock when the USB is detached or not active. Can anyone please check with a scope on there own circuit if this pin stays active all the time? Thank you that would be very appreciated Cheers Zumba

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10th June 2007, 12:35 PM	#2
zumba diyAudio Member Join Date: Jun 2007	I've just noticed a mistake in my thread, I'm refering incorrectly to BCK pin, I instead mean pin SYSCK.

10th June 2007, 02:11 PM	#3
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	MCLK runs at all times

10th June 2007, 08:33 PM	#4
zumba diyAudio Member Join Date: Jun 2007	Thank you, that saves me quite a bit of sleepless nights!