Re: ES9018S vs AK4399 and ES9008S
The ESS DACs are voltage output just like the AK4399 or AK4397, except that they have a small resistance (~200 ohm) in series with their output, which means that they can be used as a current output DAC. They are not true current output DACs like the PCM1794 or AD1955 however.
nagaesan said:
The ESS DACs are voltage output just like the AK4399 or AK4397, except that they have a small resistance (~200 ohm) in series with their output, which means that they can be used as a current output DAC. They are not true current output DACs like the PCM1794 or AD1955 however.
Re: ES9018S vs AK4399 and ES9008S
I have read only one comparison between 9008 and 9018, and I'm waiting for more. I think the improvements in sound are in the right direction.
The purpose of 32bit input? Ask ESS
For me, it could make sense only if somebody makes a firewire device out of it and then the extra bits can be used for digital volume control in the computer software.
Otherwise, just marketing.
nagaesan said:
I have read only one comparison between 9008 and 9018, and I'm waiting for more. I think the improvements in sound are in the right direction.
The purpose of 32bit input? Ask ESS
For me, it could make sense only if somebody makes a firewire device out of it and then the extra bits can be used for digital volume control in the computer software.
Otherwise, just marketing.
Re: Re: mono playback
thank you both for the replies.
there is no opposite face.
for input i tried the pc and a dvd player via toslink.
some result with both.
my other dac works fine.
i see more problems.
sometimes the sound is distorted and i have a constant hum like
ground loop.
maybe the distorted sound is because of the missing filter?
i use it without output waiting for counterpoint or ivy2.
how can the pic4 be installed wrong?
is it the one on the base?
Russ White said:
thank you both for the replies.
there is no opposite face.
for input i tried the pc and a dvd player via toslink.
some result with both.
my other dac works fine.
i see more problems.
sometimes the sound is distorted and i have a constant hum like
ground loop.
maybe the distorted sound is because of the missing filter?
i use it without output waiting for counterpoint or ivy2.
how can the pic4 be installed wrong?
is it the one on the base?
Re: Outside I/V comverter
The onboard DSP is operated in the same clock domain as the incoming data, but the rest of the DAC is operated in the domain of the master clock. The DSP does asychronous conversion between these two clock domains.
So to answer your question, yes, the master clock can be operated completely asychronous from the incoming data stream.
No. The AK4399 and all other switched capacitor DACs are voltage output by nature, so you cannot use an external I/V converter.
FuriousD said:
The onboard DSP is operated in the same clock domain as the incoming data, but the rest of the DAC is operated in the domain of the master clock. The DSP does asychronous conversion between these two clock domains.
So to answer your question, yes, the master clock can be operated completely asychronous from the incoming data stream.
nagaesan said:
No. The AK4399 and all other switched capacitor DACs are voltage output by nature, so you cannot use an external I/V converter.
I like outside I/V DAC-IC
Cauhtemoc,
We can select ES9008S(ES9018) output signal, voltage mode or current mode.
But AK4397(AK4399) ouput is only voltage mode.
I like outside I/V DAC-IC.
And may I ask a question? I'm sorry to ask several time.
What is "True current output"?
Post #1323
nagaesan wrote,
>AK4399 and AK4397, these DAC-IC are "Voltage Output DAC"
>I love current output DAC for sound quality improvement.
>But ES9018 is "Current Output DAC"...
Post #1324
Cauhtemoc wrote,
>The ESS DACs are voltage output just like the AK4399 or AK4397,
>except that they have a small resistance (~200 ohm) in series with their output,
>which means that they can be used as a current output DAC.
>They are not true current output DACs like the PCM1794 or AD1955 however.
Post #1332
nagaesan wrote,
>May I ask a question? Can AK4399 have outside I/V comverter?
Post #1336
Cauhtemoc writes
>No. The AK4399 and all other switched capacitor DACs are voltage output by nature, so you cannot use an external I/V converter.
ES9008S and ES9018, we can choice Voltage output or current output mode. As you know, if we choice current mode, I/V converter is inverting amp. So, please set ES9008S(ES9018) inverting signal with resister 13. Voltage mode, set non-inverting.
Cauhtemoc,
We can select ES9008S(ES9018) output signal, voltage mode or current mode.
But AK4397(AK4399) ouput is only voltage mode.
I like outside I/V DAC-IC.
And may I ask a question? I'm sorry to ask several time.
What is "True current output"?
Post #1323
nagaesan wrote,
>AK4399 and AK4397, these DAC-IC are "Voltage Output DAC"
>I love current output DAC for sound quality improvement.
>But ES9018 is "Current Output DAC"...
Post #1324
Cauhtemoc wrote,
>The ESS DACs are voltage output just like the AK4399 or AK4397,
>except that they have a small resistance (~200 ohm) in series with their output,
>which means that they can be used as a current output DAC.
>They are not true current output DACs like the PCM1794 or AD1955 however.
Post #1332
nagaesan wrote,
>May I ask a question? Can AK4399 have outside I/V comverter?
Post #1336
Cauhtemoc writes
>No. The AK4399 and all other switched capacitor DACs are voltage output by nature, so you cannot use an external I/V converter.
ES9008S and ES9018, we can choice Voltage output or current output mode. As you know, if we choice current mode, I/V converter is inverting amp. So, please set ES9008S(ES9018) inverting signal with resister 13. Voltage mode, set non-inverting.
Attachments
Re: I like outside I/V DAC-IC
The ESS DACs are a bit special. They are voltage output DACs, but they have a small resistance (~200 ohm) in series with their output. This means that they can be used either into a high impedance as a voltage output DAC, or into a low impedance as a current output DAC.
A "true current output" DAC is one which can only be used as current output, for example the PCM1794 or AD1955.
nagaesan said:
The ESS DACs are a bit special. They are voltage output DACs, but they have a small resistance (~200 ohm) in series with their output. This means that they can be used either into a high impedance as a voltage output DAC, or into a low impedance as a current output DAC.
nagaesan said:
A "true current output" DAC is one which can only be used as current output, for example the PCM1794 or AD1955.
Thanks for the Master Clock confirmation.
Additionally....
On the SPDIF input of the demo board, there is a note on the applications note on the ESS website stating that the SPDIF input has a 75 OHM in series with the input and that this shows an incorrect input impedance to the SPDIF input.
However, it does not specify how this should be remedied. Any ideas anyone, as I have a demo board ready to go and would like to get it setup correctly before I start.
cheers
D.
Additionally....
On the SPDIF input of the demo board, there is a note on the applications note on the ESS website stating that the SPDIF input has a 75 OHM in series with the input and that this shows an incorrect input impedance to the SPDIF input.
However, it does not specify how this should be remedied. Any ideas anyone, as I have a demo board ready to go and would like to get it setup correctly before I start.
cheers
D.
Re: Re: Re: mono playback
after some experimentation i found out that the dip switches
don`t work properly.
when i put them in the middle the sound is clear but mono
playback continues.
if i put them anywhere except the middle + or - the sound is
distorted.
maybe a firmware problem?
what is the next step i must do?
maybe sent it back to you or maybe you can sent me another pic?
thanks george.
back said:
after some experimentation i found out that the dip switches
don`t work properly.
when i put them in the middle the sound is clear but mono
playback continues.
if i put them anywhere except the middle + or - the sound is
distorted.
maybe a firmware problem?
what is the next step i must do?
maybe sent it back to you or maybe you can sent me another pic?
thanks george.
Re: Has ES9008S 200ohm series register inside IC?
No its not exactly like that.
Each symmetrical DAC segment has a fixed output impedance (R). Hint, "R" is a pretty high value.
There are "S" segments per channel. You could probably guess this number pretty easily.
4 channels in parallel per DAC.
Now its just simple math.
R / S / 4 = 195.3125 ohms
I can't give any more details.
Cheers!
Russ
nagaesan said:
No its not exactly like that.
Each symmetrical DAC segment has a fixed output impedance (R). Hint, "R" is a pretty high value.
There are "S" segments per channel. You could probably guess this number pretty easily.
4 channels in parallel per DAC.
Now its just simple math.
R / S / 4 = 195.3125 ohms
I can't give any more details.
Cheers!
Russ
Re: Has ES9008S 200ohm series register inside IC?
What I said is true from a functionality standpoint, but I simplified it somewhat to make it easier to understand.
But if you want the gritty details, the output of each DAC consists of 64 MOSFET switches, and each MOSFET switch has a resistance of 50k Ohms. This means that each channel has an output impedance of 50k / 64 = 781,25 Ohms, and 4 channels connected in parallel has an output impedance of 781,25 Ohms / 4 = 195,3125 Ohms.
Russ, you already knew this, but others probably did not. Dustin has also previously revealed this information publicly, so I don't think I'm violating any NDAs by posting it.
Russ White said:
What I said is true from a functionality standpoint, but I simplified it somewhat to make it easier to understand.
But if you want the gritty details, the output of each DAC consists of 64 MOSFET switches, and each MOSFET switch has a resistance of 50k Ohms. This means that each channel has an output impedance of 50k / 64 = 781,25 Ohms, and 4 channels connected in parallel has an output impedance of 781,25 Ohms / 4 = 195,3125 Ohms.
Russ, you already knew this, but others probably did not. Dustin has also previously revealed this information publicly, so I don't think I'm violating any NDAs by posting it.