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-   -   how to connect the TDA1541A to the DF1706 ?? (http://www.diyaudio.com/forums/digital-source/16076-how-connect-tda1541a-df1706.html)

weissi 5th June 2003 06:19 PM

how to connect the TDA1541A to the DF1706 ??
 
Hi!

reading the datasheets made no wise man out of me ;-)

So, is there a way to connect them?
I think it does need only some HCT logikīs, but as I sayed: Iīm not a wise.....

rfbrw 9th June 2003 12:10 AM

Have you considered a SM5841A and a microcontroller no glue logic required ?
The datasheet for the TDA1541A gives 6.4MHz as the maximum bitclock rate and at 8Fs bitclock from the DF1706 is 11.2896MHz.

ray.

weissi 9th June 2003 01:02 AM

Hi!

the SM5841A was in fact my first thought.... itīs available at farnell and costs about 12€......
but then curiosly 2 DF1706 arrived from TI ;-) of course for free....
I might use them in conjunction with my WM8716īs, itīs my first approach to diy sigmadelta converters so I will use 2 WM8716 in differential mode feeded by the DF1706 thats gets the signal from a DIR1703 .... the only problem: 4 SSOPīs to solder :( unfortunately I am not able to produce PCBīs with that fine resolution, 1mm is the best I can get.....

Iīm still in the phase to find the right DAC concept..... what I have tested yet where the TDA1543,TDA1541A, PCM1716....
And the TDA1541 was definetly the best....
what is next:
PCM1730
2xWM8716
and maybe PCM56

What do you use?

rfbrw 9th June 2003 05:51 AM

As far as digital audio goes I'm still in the Stone Age. I use an old Audionote PCM63 based dac complete with evil oversampling.
I plan to replace that with one built around a DIR1701,DF1706, 8xPCM1738 and a large FPGA for even more oversampling.
On the subject of PCB's why not get them made? The prices seem quite reasonable now.
Going back to the TDA1541A and the DF1706 you could experiment with running the TDA1541A above its rated bitclock specs
or do what Cambridge Audio and Wadia did (and Wadia may still do) and Teac does and use 2 TDA1541A's per channel with each dac decoding alternate samples.

ray.

weissi 9th June 2003 12:59 PM

8 PCM1738?? but still cheaper than 2 PCM1704...

rfbrw 9th June 2003 10:22 PM

I note you include the TDA1543 and the TDA1541 in your list. Assuming you tried them in non-os, did you try them balanced?

ray.

weissi 11th June 2003 04:42 PM

Hi!

I used the TDA1543 in "normal" non-os config (with active I/V) but I didnīt liked the sound of it..... with headphones, the highs sound more or less terrible compared to the TDA1541A.
I also tried the TDA1541A in parallel via a summing amplifier ->
I couldnīt say whatīs better......
But how to implement two TDA1541 in a balanced configuration without a digital filter? (Iīm only to lazy to think of it seriously, and as far as I know it only improves SNR significantly, thatīs not a matter to me....)
But any (cheap,hehe)suggestions are very welcome!
I really donīt want to spend much money on that....
It gives me satisfaction to build all my stuff out of mostly recycled components :-)

wssi.

Jocko Homo 11th June 2003 04:56 PM

Cheap suggestions????
 
Did you try inverting the data to one of them yet????

Balanced increases signal 6 dB, noise 3 dB.

Jocko

weissi 11th June 2003 07:13 PM

Hi!
Oh, wow, inverting one signal :scratch: :bawling:
I had to find a 04
but first I will finish my df1706/WM8716īs differential combo.....
I'm really interessted in how "good" delta/sigma converters may sound.... only those fu**in SSOPīs :bawling:

another thing: I never heared any difference between NE5534īs and AD797īs or OPA604īs..... only esotheric stuff??? but I encountered some HF problems with the OPA604, generally spoken my circuitry causes FET-opamps to oscillate, maybe some capacitive influences in conjunction with the high input impedance?

wssi

rfbrw 12th June 2003 01:09 AM

Quote:

Originally posted by weissi
Hi!

I used the TDA1543 in "normal" non-os config (with active I/V) but I didnīt liked the sound of it..... with headphones, the highs sound more or less terrible compared to the TDA1541A.
I also tried the TDA1541A in parallel via a summing amplifier ->
I couldnīt say whatīs better......
But how to implement two TDA1541 in a balanced configuration without a digital filter? (Iīm only to lazy to think of it seriously, and as far as I know it only improves SNR significantly, thatīs not a matter to me....)
But any (cheap,hehe)suggestions are very welcome!
I really donīt want to spend much money on that....
It gives me satisfaction to build all my stuff out of mostly recycled components :-)

wssi.


To create L+/L- in one dac and R+/R- in the other as in fig 28 on pg15 of the AD1852 datasheet requires one 4517,one 74HC14 and one 74HC157, probably less than 3Euros for all 3 chips. Is that cheap enough?

ray.


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