Unfortunately, DigiKey has canceled my order of the AK4458 chips because of long delivery time, so I need to make a new order >50€. I do not really like this politics, but I have no other choice to purchase the ICs...🙁
So, there is the question: would someone buy this DAC too? Possibly a group buy?
(if needed I have some PCBs too, because of minimal ordering amount /10 pcs./)
So, there is the question: would someone buy this DAC too? Possibly a group buy?
(if needed I have some PCBs too, because of minimal ordering amount /10 pcs./)
I would be interested in the DAC board. But I already have the Twisted Pair IVY boards. Do you know if the are compatible? It uses the balanced outputs of the es9018 in current mode.
The DAC has 8 channels, 5,6V p-p (2Vrms) balanced (symetrical) voltage output, and needs a low-pass 2nd order filter @ about 100-200kHz f3.
There is an option to use it in mono mode, you have then a little better distortion parameters and only 4 channels.
I'll see the compatibility with TP-IVY in the evening...
There is an option to use it in mono mode, you have then a little better distortion parameters and only 4 channels.
I'll see the compatibility with TP-IVY in the evening...
It seems to be working...🙂
I've made only one small mistake on the pcb (thanks for god no more), but it could be easily corrected.
The very first listening impressions (in parallel mode, tested with a cheap passive speaker) are very impressive (detailed, full-body sound)!!
I've made only one small mistake on the pcb (thanks for god no more), but it could be easily corrected.
The very first listening impressions (in parallel mode, tested with a cheap passive speaker) are very impressive (detailed, full-body sound)!!
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My only small problem is for testing in parallel mode:
"After AVDD and TVDD are powered-up, the PDN pin should be "L" for 150ns."
It means I need to delay the PDN pin setup from "L" to "H", or make it by hand 🙂.
But soon will be the Arduino installed, so this will be no more problem then...
"After AVDD and TVDD are powered-up, the PDN pin should be "L" for 150ns."
It means I need to delay the PDN pin setup from "L" to "H", or make it by hand 🙂.
But soon will be the Arduino installed, so this will be no more problem then...
DimDim,
if I'd like to control the AK4458 with Arduino, can I simply connect the SDA, SLC, GND pins together or are there some specialities to care about?
if I'd like to control the AK4458 with Arduino, can I simply connect the SDA, SLC, GND pins together or are there some specialities to care about?
I haven't read the AK4458's datasheet in detail, but from a quick scan it looks like you'd need to start by using the PDN pin to do a reset on power-on and then use the I2C pins to connect to the Arduino. Beware that the I2C pins are expecting 3.3V levels, not 5V. So it would be a good idea to use either a 3.3V Arduino or voltage conversion devices.
Of course I'm assuming that you have set the chip up for I2C control.
Of course I'm assuming that you have set the chip up for I2C control.
Some listening with my LXmini system:
The sound seems to be a little raw and not so sophisicated, airy like my older PCM1794.
Ground noise level any dynamics are very good.
Perhaps the capacitors needs time to burning in, and/or I should try other digital filter setups (if I make the controller ready for use).
The sound seems to be a little raw and not so sophisicated, airy like my older PCM1794.
Ground noise level any dynamics are very good.
Perhaps the capacitors needs time to burning in, and/or I should try other digital filter setups (if I make the controller ready for use).
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PCM1794 is better to compare with AK4490/93/95/97 and not with AK4458.
But in any case, AK4458 sound is rather good for 8ch chip.
Much better then AK4440 (I have both).
So, you mean that you do not have an AK4458 vs PCM1794 experience, but the PCM1794 seems to be better than the stereo AK chips...?
You have a nice hompage with intresting projects!
Can I ask how do you make the DAC analog power supply?
You have a nice hompage with intresting projects!
Can I ask how do you make the DAC analog power supply?
No, because last time I made DAC with PCM/DSD-1792/94 more then 10 years ago, and do not have any one now.
It depend which chips.
I think PCM1794 is comparable with AK449x (and AK is better to my mind).
But AK4458 is more simple then AK449x also then PCM1794.
Thanks.
In AK4458 DAC I used LP2985 for AK and lm317/333 for OP in LPF.
Can I ask why exactly the LP2985? There are some types with much lower noise and small enough package (e.g. LT3042)...