No AD1865 is also segmented dac structure. It is from datasheets. Someone alsi posted internal structure diagram...And what about AD1865 and PCM63, what is their internal structure?
AD1865 is mentioned everywhere as a pure R2R DAC. That's why it was first on my list, except that it's easy to get and not too expensive.
By digging a little on that site you may find a TDA1862 triple crown and with a little luck if the month's employee is managing your shipment you could receice a BMW320D ... oups D was not for Dac. ...firered!What do you think about PCM63P-K2 made in Hong Kong?
Is this site real ?
I put a link in my post for the published version, but it already has upgrades that have not been published yet.The Jung Shunt Regulator has already been published and is public property.
It is not wide band and gets inductive at HF. It only has low noise and lots of gain at LF.
There are better wide-band regulators around.
My 2 cents,
All good, I got in contact with them and could resolve the PayPal mess…Does anyone has a contact at JLSounds for me. I ordered their I2SoverUSB yesterday, or better said I tried…
PayPal crashed and didn’t send me back to jlsound homepage. The order is in, at least the money was send BUT PayPal sent a total wrong address! So I spent 112€ on something which will never reach me. Paypal declined my case of cancellation, for whatever reason. I am desperately trying to contact JLSound but didn’t get any response on my email. I didn’t got an order confirmation either. Just the money is gone. PLEASE HELP!
Honestly, I don't know. I always make sure that the distance from the regulator to the load is as small as possible, regardless of whether it is ADM7150 or Walt's shunt. For shunt I usually make small PCBs that are easy to place up to the load itself. For my new DAC with TDA1547 on the main PCB there will be six Walt shunts right next to the load.What is happening when these regs are far from the load VS another more little IC reg less good in but ultimatly nearer or close from the load ? Impedance, inductive long traces... long current loops...
Which one is winning when it comes to the listening test ?
Take a look at the simplified input format of AD1862. That is more like time simultaneous format without inverted MSB, and sign.@miro1360, looking a bit closer at your diagram I think it might not work that way. From the PCM1702/4 datasheets: "if BCLK is stopped between input data words, the last 20/24 bits shifted in are not actually transferred from the serial register to the parallel DAC register until WCLK goes LOW. WCLK must remain LOW until after the first BCLK cycle of the next data word to insure proper DAC operation." This is also shown in the PMD100 datasheet, see this screen shot:
An inverted DG also might work as WCKO. Here is what I think how your digram could look like:
The timing diagram of the AD1862 shows the same requirement: WCKO stays low until after first BCK cycle of DATA transfer, goes high, and goes low again only after last BCK cycle of DATA transfer:
What do you think?
Hi MiroThe "unwanted" DATA is not feeded into the DAC because the clock is stopped. Making it total clean adds to the complexity
PCM1702/4 is specific (because of the BCK requirement - the jitter in BCK can affect the sound), but the AD1862 has not this requirement and the output depends only on the low going LATCH (jitter in LATCH - LRCK can affect the sound) - That is why I don't want to modify the LRCK signal because the XMOS processor outputs it very clean
Sounds interesting. As long as there's not too much smd work this could be fantasticWith all the power supply discussions recently, seems like a perfect time to ask opinions about what types of psu would be favored to include onboard an AD1862 dac. After building several versions of MiroDac the common source of “clutter” always seems to be the multiple external power supply boards needed. I’d like to clean up this aspect of the build and leave off-board real estate options for I/V and output stages.
4 supplies would be minimum, +/-12v and +/-5v but possibly 6 supplies if onboard I/V (opamps) will be independent from dac chip supply.
In order to make an all inclusive board such as this, space would have to be used carefully thus requiring the use of some SMD components. What do you guys think?
Why are you bombarding the topic with digital filters ? I mean you're going in with the digital filter story to ruin the DAC theme that it doesn't have and shouldn't have. We have consciously rejected what should be at the DAC entrance outside the manufacturer's recommendations.That is why Pacific Microsonics did different from all other digital filter ICs...
We actualy dont know are the outputs of the XMOS are clean?
No?Why are you bombarding the topic with digital filters ? I mean you're going in with the digital filter story to ruin the DAC theme that it doesn't have and shouldn't have. We have consciously rejected what should be at the DAC entrance outside the manufacturer's recommendations.
Please understand that there is no galvanic isolation from the computer in case of just separate power supply to the USB interface. This is not true because +D and -D have to refer to the GND plane that is common even with external PS. Noise from motherboard transferring via ground plane into the USB interface too...That's why you have two power supplies on the JLSound I2SoverUSB - which are galvanically separated from the computer USB and its SMPS and any noise that the motherboard can produce. The goal is to have only D + and D- at the XMOS input. But if that's not enough for your purist mind, there are PCI USB cards with high-precision XO oscillators. And you don't need any filter in the world for this.