Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board - Page 17 - diyAudio
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Old 30th December 2012, 05:37 PM   #161
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Quote:
Originally Posted by merlin el mago View Post
If no one for beta tester & regal lend the fifo, I'm offer as beta tester.
Quote:
Originally Posted by clivem View Post
You already offered! You were first to offer to test and you are second on the interested list. In my book, that makes you the prime candidate.

<cheeky>Ian, please hurry up and send him the board. Let's get this show on the road..... LOL.</cheeky>

PS. I've added myself to the list for 2 boards. I'll re-work my balanced dual AD1865 DAC with one of the boards and finally build the 1704 I've been putting off forever.
Yes, merlin el mago is the first one offering evaluate the daughter board on 1704. clivem is the second, but he recommend regal. regal said his time off from work is about to end

merlin el mago,
Is your 1704DAC ready to open the input ports? It comes with DF? The daughter board needs to be placed between the I2S source and the 1704.
Please let me know your configuration.

Thank guys.

Ian
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Old 30th December 2012, 05:45 PM   #162
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I have the Elektor HIF2000 DAC: 2 pcm1704 + 1 df1704 and in a separate board the receiver CS 8414/16.
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Old 30th December 2012, 06:16 PM   #163
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Ready to play.
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Old 30th December 2012, 10:20 PM   #164
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Quote:
Originally Posted by merlin el mago View Post
I have the Elektor HIF2000 DAC: 2 pcm1704 + 1 df1704 and in a separate board the receiver CS 8414/16.
Thank you so much merlin el mago for offering evaluating the daughter board for the community on your PCM1704 DAC. Please send me your shipping address to iancanada.mail@gmail.com.

I'll assemble another board and send it to you.

Happy New Year.

Ian
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Old 30th December 2012, 10:32 PM   #165
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Originally Posted by bisesik View Post
Ian, any experience with TDA154x (1541)?
TDA1541 can accept standard I2S signal. So normally we do not need the I2S to PCM daughter board to interface fifo with it.

However, it has a L/R simultaneous input mode(OB/TWO connected to VDD1) which I thinks might be better option for SQ. But the data format has to be in offset binary.

I know there are a lot of 1541 expert over there, any comment on this issue?

Regards,

Ian
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Old 31st December 2012, 10:25 AM   #166
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Quote:
Originally Posted by iancanada View Post
Thank you so much merlin el mago for offering evaluating the daughter board for the community on your PCM1704 DAC. Please send me your shipping address to iancanada.mail@gmail.com.

I'll assemble another board and send it to you.

Happy New Year.

Ian
Sent email with address.

Happy New Year 2u2.

Felipe
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Old 1st January 2013, 02:16 AM   #167
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by iancanada View Post
TDA1541 can accept standard I2S signal. So normally we do not need the I2S to PCM daughter board to interface fifo with it.

However, it has a L/R simultaneous input mode(OB/TWO connected to VDD1) which I thinks might be better option for SQ. But the data format has to be in offset binary.

I know there are a lot of 1541 expert over there, any comment on this issue?

Regards,

Ian
Hi Ian,

I'm no expert but I've been listening the the TDA1541A running at 16bit/44.1k using the FIFO for a bit over a month now. With the I2S to PCM convertor board you get the added "advantage" of oversampling of up to 8x (352.8k).

The 1541A will accept up to 4x oversampling in I2S mode, so the oversampling can be done before the FIFO, the benefit being less added jitter after the FIFO.

So you have a few options:
- Use FIFO connected directly to 1541A using 16/44.1
- Oversample 4x before the FIFO then to the 1541A
- Oversample after the FIFO up to 8x but with the added jitter of conversion.

Hope this helps. If i've made any errors anyone - please correct me.

Ryan
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Old 1st January 2013, 02:23 AM   #168
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Quote:
Originally Posted by ryanj View Post
Hi Ian,

I'm no expert but I've been listening the the TDA1541A running at 16bit/44.1k using the FIFO for a bit over a month now. With the I2S to PCM convertor board you get the added "advantage" of oversampling of up to 8x (352.8k).

The 1541A will accept up to 4x oversampling in I2S mode, so the oversampling can be done before the FIFO, the benefit being less added jitter after the FIFO.

So you have a few options:
- Use FIFO connected directly to 1541A using 16/44.1
- Oversample 4x before the FIFO then to the 1541A
- Oversample after the FIFO up to 8x but with the added jitter of conversion.

Hope this helps. If i've made any errors anyone - please correct me.

Ryan
Thanks Ryan,

In this case, we need running 1541 at L/R simultaneous input mode(OB/TWO connected to VDD1). But the data format has to be in offset binary, if I'm not wrong. Do you have any experience on this offset binary format?

Happy new year

Ian
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Old 1st January 2013, 03:22 AM   #169
ryanj is offline ryanj  Australia
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Quote:
Originally Posted by iancanada View Post
Thanks Ryan,

In this case, we need running 1541 at L/R simultaneous input mode(OB/TWO connected to VDD1). But the data format has to be in offset binary, if I'm not wrong. Do you have any experience on this offset binary format?

Happy new year

Ian
Happy new year to you Ian!

Im afraid we have reached the extent of my knowledge on this subject.

No i havn't used the 1541 in offset binary format.

Ill have to do some study on the subject.

happy new year all.

Ryan
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Old 1st January 2013, 05:45 AM   #170
erin is offline erin  Australia
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Quote:
Originally Posted by iancanada View Post
TDA1541 can accept standard I2S signal. So normally we do not need the I2S to PCM daughter board to interface fifo with it.

However, it has a L/R simultaneous input mode(OB/TWO connected to VDD1) which I thinks might be better option for SQ. But the data format has to be in offset binary.

I know there are a lot of 1541 expert over there, any comment on this issue?

Regards,

Ian
The L/R simultaneous mode is probably the most desirable way to use your board with the TDA1541. Very few TDA1541 designs use offset binary because of the complexity of the glue logic required to do this.

I have never tried it, but my understanding is that offset binary is the same as two's compliment, just with the MSB inverted.

These two links seems to explain it well.
C3Dformat
Offset binary - Wikipedia, the free encyclopedia


I will be interested to try offset binary with the TDA1541 this when the boards are finally ready.
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Last edited by erin; 1st January 2013 at 05:57 AM.
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