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#1 Posted : Friday, July 15, 2011 12:11:46 AM(UTC)

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Joined: 6/14/2011(UTC)
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Hello Russ,
Current I want to replace the DAC of my current CD player(Teac VR25)with the COD module + legato IV converter, but have problems in 'stealing' the signal from my CD Player. My current CD player is using AD1893 for upsampling. I look at AD1893 data sheet and I can only find XTAL-O DATA_I, BCLK_I, WCLK_I and LR_I which I think may be most situable pins for getting I2S for inputting to the COD.

I think DATA_I of my CD player should connect to DIN of the COD module
BCLK_I of my CD player should connect to BCK "
LR_I of my CD player should connect to LRCK "

but for the rest, i.e XTAL-O and WCLK_I of my CD player then I am not sure whether it should be connected to SCK and no connection at all to the COD module respectively.

Look forward to hearing from you.
#2 Posted : Wednesday, February 21, 2018 7:05:06 PM(UTC)

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United States

I have a similar question regarding I2S input --

Will the COD board accept 16-bit data? and what about a master clock signal?
The TI data sheet for 1794a indicates that it might, but I want to be sure before I get a COD board.

My plan is to remove a Philips TDA 1543 chip in an old Philips-base CD player, and tap into the digital data at or near the chip socket, which has the following inputs:

BCK (bit clock input)
WS (word select input)
DATA (data input)
GND (ground)

The TI 1794 has similar digital inputs that match the above:

BCK (bit clock input)
LRCLK (left-right clock, same as WS)
DATA (serial audio data)
DGND (digital ground)

Plus others, most notably SCK (system clock).

The COD board requires BCK, LRCLOCK, and DIN (DATA in), and digital ground. The COD board also requires a SCK input. Can I use a clock signal from one of the decoders in the CD player (Philips SAA7210), which has two XTAL outputs? Can I use the BCK signal for the SCK, which seems to be the original I2S standard? I can measure clock rates etc. with a scope to make sure they are correct, but it would be good to know if the COD will work with an old CD player, even if it takes some extra work.


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