Will This USB->I2S Module Work Well with AD1862?

[spaceman5]

Hi All


After being warmly recommended about the AD1862 DAC chip,
I ordered it, and would like to create a DAC from it.


My wish is to first bring it up to life ASAP,
so I would like to initially use some existing modules that can take out a part of the work on the PCB, (like the USB->I2S part, and later also Optical SPDIF->I2S part), and simply get them as ready-made modules.

This will enable me to create a working prototype faster,
and later on I can then also improve that part if needed.


So my question:

I found this nice module:

PCM2706 USB to I2S:

PCM2706 USB to I2S daughter card Italy Amanero the same size | eBay


It costs 9$.

Will it work well with the AD1862 chip?


Thank you all

 

[00940]

Read this: https://www.analog.com/media/en/technical-documentation/application-notes/383160163AN207.pdf , what you need to interface this board to your ad1862 is the fig 3 in there.

If you search ad1862 and I2S on the forum, you'll find some diy solutions.

 

[spaceman5]

Hi 00940

Thank you very much.

The reason for the need of this extra circuit, is because the AD1862 is 20bit, and the USB->I2S module is 16bit?
Or there's another reason?

 

[00940]

The reason is that the AD1862 doesn't support I2S as input format.

 

[spaceman5]

Oh..
I see.

Thank you for your help..

 

[rfbrw]

Read this: https://www.analog.com/media/en/technical-documentation/application-notes/383160163AN207.pdf , what you need to interface this board to your ad1862 is the fig 3 in there.

Are you sure about that ?

 

[00940]

@rfbrw: heck you're right, I forgot at first the ad1862 was 20bit (and I didn't think it through in my 2nd post).

@spaceman: have a look here: High End Audio - Digital decoder for NOS DAC or Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board

Or you could just get this pcb without the ad1862: AD1862 R2R Isolated nonoversampling NOS Audio DAC with FIFO reclock - DIYINHK

I'm sure happy modern dac have settled on I2S...

 

[spaceman5]

@rfbrw: heck you're right, I forgot at first the ad1862 was 20bit...

So I should forget about the AN-207 document?

@spaceman: have a look here: High End Audio - Digital decoder for NOS DAC or Drive NOS AD1865/62,PCM1704/02/63,TDA1541 from FIFO: Universal I2S-PCM driver board

Or you could just get this pcb without the ad1862: AD1862 R2R Isolated nonoversampling NOS Audio DAC with FIFO reclock - DIYINHK

Thanks, will check these options and choose one..

 

[00940]

Well you can read AN-207 for your education, just don't copy the schematic as is. The diyinhk DAC appears to use an adaptation of that schematic (see here)

 

[analog_sa]

This is perhaps the easiest solution.

I2SoverUSB - I2S over USB Audio

 

[spaceman5]

This is perhaps the easiest solution.

I2SoverUSB - I2S over USB Audio

Interesting..

They write there

Directly supports PCM1704, PCM63, PCM61, PCM58, PCM56, AD1862, AD1865, AD1861, AD1860, AD1851

If only it was not priced so high..

 

[lcsaszar]

I found a solution here.

 

[spaceman5]

Thank you lcsaszar

It says AD1865, it's good also for AD1862?

 

[weissi]

Do yourself a favor and get the Interface from JLsounds. It works perfectly, has good quality crystals, isolation and reclocking.

 

[miro1360]

If you want to test the AD1862 in cheap way, you can do it with the "PCM2706 USB to I2S" from your first post. But you will need more as that.
In addition, you will need:
- I2S/PCM converter for 20-bit, you can take it from this schematic:
https://www.diyaudio.com/forums/att...1862-dac-headphone-amp-easydac_1-2_01_sch-jpg (all the 74HCT164D chips, 74HCT164N is DIP version of that chip)
- clean power supply for digital part (+-5V) (LM317/337 or 7805/7905)
- clean power supply for analog part (+-12V ... alternatively +-5V can be used) (LM317/337 or 7812/7912)
- active I/V (start with the basic opamp I/V), you can feed it from the DAC power supply for analog part
- use only high quality capacitors
- create double-sided PCB with solid GND, logically arrange the digital and analog parts so that they do not cross

 

[analog_sa]

In addition, you will need:

Yup. You can easily spend more than the price of the JLSounds and end up with a bunch of pcbs, high jitter and the inability to play anything hires. But think about how much you can learn in the process

 

[spaceman5]

Thank you all for the tips
miro1360: what a helpful list, really appreciate it.


Yesterday I thought about something..
Is there any chance someone here in DIYaudio has an AD1862 board (without the DAC chips) that he might want to sell?

For example because he created several iterations, and reached the highest level of sound he can get,
and then all previous boards are unused? and one of which I can buy..

 

[miro1360]

I can check my house for the older version from diyinhk. But it comes without the DAC chips, without the I/V opamps and without power supplies.
I did something with the output I/V because diyinhk provided it with the output filters and if I remember right, I removed this filtering.
Can you get the I2S from ebay?

 

[spaceman5]

I see.
Thanks.
Maybe I'll ask in the Swap forum if someone has a full pcb..

 

[spaceman5]

BTW another thing that I thought about..

In this current thread, I asked about USB->I2S,
but then was told that the AD1862 doesn't take I2S but something different, and hence the need for a conversion after getting I2s,
or, for the JLsounds module.

If I change my input requirement, from USB, to SPDIF Optical,
so Toslink->AD1862 (and not to I2S), is there a simple and good solution for that?
(that hopefully doesn't cost 63Euro...)