Following our DAC modules based on ES9022/23 and PCM5102, both of which have I2S inputs to interface with the QA550 SD Player, as well as our own WM8804 SPDIF Receiver, we have made a new module for the AK4430 DAC.
This is the first picture of the first prototype, which works first time. It is still a bit messy, but that is usually the case for the first prototype. As ususal, it has ultra-low-noise LT1761 regulators on board, this time 2x for the DAC. The on-board low-jitter XO on the left hand side of the PCB, with its own LT1761 regulator, is not soldered in this prototype. Our usual frequency divider to enable use of 45MHz to drive the QA550 direct can also be used in this layout.
We shall make further refinements, and then comparison between the three different DACs.
The AK4430 is easily available, e.g. :
http://www.digikey.com/product-detail/en/AK4430ETP-E2/974-1017-1-ND/2333403
So it would make a good DIY project to get people to solder 0402 SMD components.
Here the link to the datasheet :
http://www.akm.com/datasheets/ak4430_f00e.pdf
🙂
Patrick
This is the first picture of the first prototype, which works first time. It is still a bit messy, but that is usually the case for the first prototype. As ususal, it has ultra-low-noise LT1761 regulators on board, this time 2x for the DAC. The on-board low-jitter XO on the left hand side of the PCB, with its own LT1761 regulator, is not soldered in this prototype. Our usual frequency divider to enable use of 45MHz to drive the QA550 direct can also be used in this layout.
We shall make further refinements, and then comparison between the three different DACs.
The AK4430 is easily available, e.g. :
http://www.digikey.com/product-detail/en/AK4430ETP-E2/974-1017-1-ND/2333403
So it would make a good DIY project to get people to solder 0402 SMD components.
Here the link to the datasheet :
http://www.akm.com/datasheets/ak4430_f00e.pdf
🙂
Patrick
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So do the ES9022 and the PCM5102 if done correctly. So difficult call which to choose.
We need some more testing and listening before making a judgement.
But as you said, it sounds great, and very easy to get.
Cheaper than the PCM5102 as well, and simpler to implement.
But not as flexible as the 9022/3.
Patrick
We need some more testing and listening before making a judgement.
But as you said, it sounds great, and very easy to get.
Cheaper than the PCM5102 as well, and simpler to implement.
But not as flexible as the 9022/3.
Patrick
cute little PCB, the trace layout looks almost 70's floral, if you know what I mean. yeah this dac is not bad, i've heard it in the fostex HP-P1
Our PCB layouts are done effectively by hand and not by PCB software.
So we can do things that are very difficult to copy.
And of course they are as they are for good reasons.
🙂
Patrick
So we can do things that are very difficult to copy.
And of course they are as they are for good reasons.
🙂
Patrick
Hi,
Have you ever looked directly at the output of the DAC at pins 9 / 10?
I have this DAC in a prototype, and I'm seeing quite a bit of noise on the output. My power supplies are clean, and I'm wondering if this is due to my layout or some inherent issue with the DAC. I can put a 20kHz LPF on the output and it gets rid of most of it, but I don't think it should be there in the first place. If you could find the time to scope the output, I'd appreciate it!
Have you ever looked directly at the output of the DAC at pins 9 / 10?
I have this DAC in a prototype, and I'm seeing quite a bit of noise on the output. My power supplies are clean, and I'm wondering if this is due to my layout or some inherent issue with the DAC. I can put a 20kHz LPF on the output and it gets rid of most of it, but I don't think it should be there in the first place. If you could find the time to scope the output, I'd appreciate it!
any news ?
will be nice if you have time.... to speak about difference of the this 3 dac
the pcb look nice too
will be nice if you have time.... to speak about difference of the this 3 dac
the pcb look nice too
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Have not spotted the recent posts. My apologies.
Not enough time to listen properly, so conclusion to come later.
But probably very subjective.
Shall measure the output noise and post some pictures in the next days.
Patrick
Not enough time to listen properly, so conclusion to come later.
But probably very subjective.
Shall measure the output noise and post some pictures in the next days.
Patrick
tinnitus
HI as i have a tinnitus and the out filter on the datasheet is similar for BB/Ess what can better for tinnitus ?
I and some around the world don't have problem with vinyl...in band noise or out band noise ?!?
thanks a lot
HI as i have a tinnitus and the out filter on the datasheet is similar for BB/Ess what can better for tinnitus ?
I and some around the world don't have problem with vinyl...in band noise or out band noise ?!?
thanks a lot
You can try Joachim Gerhard's filter for ES9023.
Alternatively there are various reconstruction filters on the internet to reduce DAC ringing.
But there will always be some, depending filter cut-off.
Patrick
Alternatively there are various reconstruction filters on the internet to reduce DAC ringing.
But there will always be some, depending filter cut-off.
Patrick
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