uC DAC tester? - Page 2

emuman100 · 11th July 2004, 11:33 PM

Well, after looking at it, I'll be choosing parts. Only part that I'm unsure of is the clock. What I plan on using to convert from i2s to S/PDIF is a DIT4096. Thing is, I need two extra clocks. First clock is the main clock, at 1.4112MHz which clocks the counter and binarey clock line. Second clock is The master clock to clock the DIT4096. I am not experienced in designing a PLL. Can I use a higher frequency crystal and use a counter to divide the clock? If I use a crystal that outputs a sine wave, I'll need to use some sort of IC to convert it to a square and divide the clock.

Thanks.

jobstens · 11th July 2004, 11:55 PM

a 4040 will do that

Regards

Jobstens

jobstens · 11th July 2004, 11:57 PM

Sorry, the 4040 will devide the 11.2896 or 22.5792 MHz by 4 or 8 to the needed 1.4112MHz (which is 44100*32)

till · 12th July 2004, 12:16 AM

what about making that I2S with a microcontroller and convert it with your DIT to SPDIF?

but same again, for the I2S signal you want, also first please a timing diagramm.

jobstens · 12th July 2004, 12:36 AM

It's me again ...

you don't need to delay the data for 1 bit to use i2s. the DIT4096 accepts left justified data with 0 SCLK delay (see page 7 in the manual) ISYNC should be set to 1.

Build an osc. with 11.2896 MHz
This is MCLK to the DIT
This goes to the 4040 too.
On Q2 (Pin 6) you got your SCLK (1.4MHz),
Q3-Q6 from 4040 equals to Q0-Q3 in the EPROM circuit
Q7 from 4040 is Q4 = LRCK (44.1kHz)

LRCK goes to a second 4040 which generates Q5-Q13 (Output on the second 4040 = Q0 - Q8). With D1 you are reseting only the second 4040 - but you must inverting D1 or I do in a new binary (attached)

Could I remove all clarities ? ;-)

Regards

Jobstens

jobstens · 12th July 2004, 01:26 AM

Quote:

Originally posted by till
what about making that I2S with a microcontroller and convert it with your DIT to SPDIF?

but same again, for the I2S signal you want, also first please a timing diagramm.

You asked for it ;-)
enjoy it !

Regards

Jobstens

rfbrw · 12th July 2004, 02:01 AM

Quote:

Originally posted by jobstens

You asked for it ;-)
enjoy it !

Regards

Jobstens

jobstens · 12th July 2004, 02:31 AM

Emuman - here is a new version of the circuit ...

Regards

Jobstens

emuman100 · 12th July 2004, 04:23 AM

jobstens,

You are a genious! I think you should assemble this too. I'll make a digikey parts list tonight. THANK YOU SO MUCH!

rfbrw · 14th July 2004, 05:22 PM

Quote:

Originally posted by till
what about making that I2S with a microcontroller and convert it with your DIT to SPDIF?

but same again, for the I2S signal you want, also first please a timing diagramm.

You would be better served considering the instruction cycle time of the microcontroller you intend to use.

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11th July 2004, 11:33 PM	#11
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	Well, after looking at it, I'll be choosing parts. Only part that I'm unsure of is the clock. What I plan on using to convert from i2s to S/PDIF is a DIT4096. Thing is, I need two extra clocks. First clock is the main clock, at 1.4112MHz which clocks the counter and binarey clock line. Second clock is The master clock to clock the DIT4096. I am not experienced in designing a PLL. Can I use a higher frequency crystal and use a counter to divide the clock? If I use a crystal that outputs a sine wave, I'll need to use some sort of IC to convert it to a square and divide the clock. Thanks.

11th July 2004, 11:57 PM	#13
jobstens diyAudio Member Join Date: Jun 2004 Location: near Hannover	Sorry, the 4040 will devide the 11.2896 or 22.5792 MHz by 4 or 8 to the needed 1.4112MHz (which is 44100*32)

12th July 2004, 12:16 AM	#14
till Banned Join Date: Apr 2002 Location: Germany, Clausthal	what about making that I2S with a microcontroller and convert it with your DIT to SPDIF? but same again, for the I2S signal you want, also first please a timing diagramm.

12th July 2004, 04:23 AM	#19
emuman100 diyAudio Member Join Date: Jan 2004 Location: US	jobstens, You are a genious! I think you should assemble this too. I'll make a digikey parts list tonight. THANK YOU SO MUCH!