DF1704 with the Sony transport - diyAudio
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Old 9th February 2002, 10:10 AM   #1
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Default DF1704 with the Sony transport

Hi all:

Would like to know how to set the DF1704 using with the Sony transport? Which setting should be suitable for this?

I decide to using the PCM1702PK+DF1704. Please advice!

The clock of the sony transport is 16.9344MHz! Thanks!
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Old 9th February 2002, 11:11 AM   #2
hifiZen is offline hifiZen  Canada
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for a 16.9344MHz master clock and sample rate (fs) of 44.1kHz, the DF1704 should automatically go into 384fs mode. I don't know what format the input I2S bus signals will be, but chances are good that it'll be the standard Sony format shown on the DF1704 datasheet here:

http://www-s.ti.com/sc/ds/df1704.pdf

You should be able to set all these modes without a micom, just by pulling the appropriate pins high or low, and putting the chip in Hardware mode.

hope that helps...
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Old 11th February 2002, 05:07 AM   #3
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Thanks for the reply!

Actrally I read the datasheet before. But I still confuse that is the Sony transport must not output the I2S format?

Then which mode should I choose for this on DF1704? 16bit,20bit??

Thanks!
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Old 15th February 2002, 08:37 AM   #4
hifiZen is offline hifiZen  Canada
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the input data will likely be 16 bit for CD-DA. you can set the output word width to match the DAC (20 bit for the PCM1702).

There is a difference between the I2S *bus* and I2S *data format*. Almost all digital audio chips are connected with the I2S bus, which just defines the wires. The format of the data being sent over the I2S bus may be in any of several formats. As you can see from the datasheet, only one of the data formats for the DF1704 is I2S. So, test the other formats to see if they work. I would start with the Sony format setting.
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Old 15th February 2002, 08:48 AM   #5
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Hi! Many thanks on your help!
But I just confuse which setting is for Sony format?
Thanks!

I am going to get the DF1704. BTW, I still have the PMD100.... But I dont want to use it on this CDP.
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Old 16th February 2002, 06:09 AM   #6
hifiZen is offline hifiZen  Canada
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see datasheet page 7, Figure 4 (a). But, this is not guaranteed to be the correct format. You may need to try all of them to find the one that works. A scope would be very handy here...
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Old 16th February 2002, 04:14 PM   #7
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Is the Sony a dedicated transport or a CD player you plan to use as a transport. If it is a transport what ic generates the digital output and if it is a CD player wnat chip is used for the dac.
Knowing the answer to the above would make helping you easier.
Meanwhile, referring to page 7 of the DF1704 datasheet.
4A. 16,20 & 24bit Sony/BB format. If I had to guess what format you should use I would go with 16 bit Sony/BB.
An i2s bus with the Sony/BB format like having coffee flavoured tea. The i2s bus IS the i2s format. It is a proprietary standard for transmitting digital audio data developed by Philips. The spec is available on the philips website.
As for the output to the PCM1702 dacs assuming you will be running the DF1704 from the 16.9344 MHz clock then you need to use the 20 bit option of Fig 6B on page 8. as 16.9344 = 384Fs

ray
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