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Old 23rd August 2011, 04:33 PM   #181
UnixMan is offline UnixMan  Europe
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Quote:
Originally Posted by 2A3SET View Post
I am not sure if we can design a good CCS with low dropout of 1.7V (5v-3.3v) and good PSRR to work with shunt.
Although for best quality I'd definitely use an indipendent power supply with (much) higher voltage, doing that would be great for portable use. Problem is, available voltage is really too small.

Perhaps for portable use you should consider a dedicated DC/DC converter which is completely disabled when providing an external power supply? (I'd say at least 12V!).
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Old 23rd August 2011, 05:30 PM   #182
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Default AW USB/I2S with TP "Buffalo" instead of AB?

In the AW thread on our italian forum a friend asked about the possibility to use the AW digital board (USB/I2S module) with the TP "Buffalo" DAC that he already owns. See post #94655, post #p94671, etc.

I'm not sure about all the details, so I ask it here 'cause I bet that there are quite many owners of a Buffalo DAC which may be interested to the answer...

Q: is it possible to use a Buffalo (I, II or III) in place of the AB? how easy/hard would it be to do so?

Q: What modifications needs to be done to the Buffalo and/or to the AW?

Q: What extra circuitry needs to be added?

(perhaps we should start another thread dedicated to this subject?)
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Old 23rd August 2011, 06:18 PM   #183
borges is offline borges  Norway
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Could you point me to an updated schematic for the Buffalo?

The signals that pass throgh the USB-I2S module are I2S (11.2896 or 12.288MHz bit clock) out and MCLK (same two frequencies) in. The module can be VBUS powered or use an external power supply. The latter case might pose some challenges to bootup and enumeration. But that is only speculation from my side.

BÝrge
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Old 23rd August 2011, 06:41 PM   #184
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Originally Posted by borges View Post
Could you point me to an updated schematic for the Buffalo?
no idea where to find it.

On the TP site there is the page about the new Buffalo III, but I can't find the schematics for it. At the end of the page there are a few links to old Buffalo's (I, II & 32s) documentation, but no schematic whatsoever (except perhaps for the very 1st one).
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Old 23rd August 2011, 06:44 PM   #185
2A3SET is offline 2A3SET  Canada
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Hopefully this helps, wiring from Musiland to Buffalo II.

Musiland 03 I2S to Buffalo II DAC: Playing 352.8Khz Music H i F i D U I N O

And the Buffalo III manual,

http://www.twistedpearaudio.com/docs...ide_V1.0.1.pdf

Quote:
Originally Posted by UnixMan View Post
no idea where to find it.

On the TP site there is the page about the new Buffalo III, but I can't find the schematics for it. At the end of the page there are a few links to old Buffalo's (I, II & 32s) documentation, but no schematic whatsoever (except perhaps for the very 1st one).
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Old 23rd August 2011, 06:50 PM   #186
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Hi Borge,

The Buffalo III uses the ES9018. Between the users manual and the spec sheets you have you have enough info.

I thought the MCLK from your I2S module ran 22/24 mhz ?
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Old 23rd August 2011, 07:28 PM   #187
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Hi George,

yes, the MCLK to the DAC is 22/24. But the serial output of the MCU won't run that fast, so there's a /2 JK flip-flop between the XO and the module.

The ES9023 needs to run its sigma-delta modulator at 22/24 in order to have high enough oversampling rates for 176.4/192 input. We could use 44/48MHz MCLKs too. The AB-1.1 board allows for that by coupling two JKs in series to divide by 4. Higher frequencies mean more jitter but also higher oversampling rates. Might be a profitable and audible trade off.

BTW, what is your clock setup like? AB-1.1 MUXes two fixed-frequency XOs from Golledge.

11/12MHz is sufficient for 24 + 24 bits at 176.4 / 192. I use the same rate in my CD player for 24 bits at 352.8 / 384. That leaves 8 dead bits which is practical since running I2S bumper-to-bumper can be a little uncomfortable.

BÝrge


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Originally Posted by GeorgeBoudreau View Post
Hi Borge,

The Buffalo III uses the ES9018. Between the users manual and the spec sheets you have you have enough info.

I thought the MCLK from your I2S module ran 22/24 mhz ?
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Old 23rd August 2011, 07:32 PM   #188
borges is offline borges  Norway
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The manual says:

"The Buffalo III DAC board uses a custom on-board ultra low jitter, low phase noise 100Mhz clock from
Crystek. The clock module lowers jitter significantly when compared to normal clocks. The clock is placed
on the board near the DAC chip to keep phase noise at low levels."

That is not immediately compatible with the USB-I2S module. But I'll have to read a bit more to tell.

BÝrge

Quote:
Originally Posted by 2A3SET View Post
Hopefully this helps, wiring from Musiland to Buffalo II.

Musiland 03 I2S to Buffalo II DAC: Playing 352.8Khz Music H i F i D U I N O

And the Buffalo III manual,

http://www.twistedpearaudio.com/docs...ide_V1.0.1.pdf
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Old 23rd August 2011, 07:38 PM   #189
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Hi BÝrge

I use a Si532 dual output clock into a divider to feed the cpu. Output freq is selected by the cpu depending on the bit rate requested.

Although it makes for a compact board the clock is custom ordered at $20 a pop not including shipping. warning::: do not order small quantities as the courier costs at almost $90 are a killer.

George
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Old 23rd August 2011, 09:24 PM   #190
UnixMan is offline UnixMan  Europe
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Quote:
Originally Posted by GeorgeBoudreau View Post
The Buffalo III uses the ES9018.
as does version two. IIRC Buffalo II by default had a slower clock, either 40 or 80 MHz.
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