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Old 6th February 2010, 10:48 AM   #801
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Hey Russ,

Haven´t read the whole thread so maybe this has been answered before.

Does the new Buffalo have provision for to be used in dual mono configuration, ie one card/channel?
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Old 6th February 2010, 12:27 PM   #802
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Hi Lars, Yes. The Buffalo II supports a "Dual Mono" configuration with the on-board firmware and there will be Volumite firmware for that configuration as well.
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Old 6th February 2010, 12:38 PM   #803
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It looks like both the Buffalo-2 and the IVY III has dual connector possibilities, at least where it can be done. Both 5.08 and 2.54mm connectors can be used, am I correct? Nice if you stack the boards so you can skip running wires.
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Old 6th February 2010, 12:39 PM   #804
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I intend to preorder and I'd like to be clear about PSU's options.
1. For Buffalo II without any of your IVY's, if I got the picture correct, Buffalo II can use only 1 external PSU, like single-pole Placid and whatever IVY will be used will need it's own PSU. Is that correct?
2. Or does Buffalo II requires also double-pole (+/-) PSU for AVCC?
3. There is an optional stackable AVCC shunt reg module. Is that correct?
4. The optional stackable AVCC shunt reg module can be powered either from 1 external PSU connected to Buffalo II's VD in, or from 1 external PSU connected directly to the AVCC shunt reg module. Is that correct?
5. How many external PSU's can the AVCC shunt reg module utilize?
6. What is/are the expected benefit(s) from the optional stackable AVCC shunt reg module?
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Old 6th February 2010, 12:43 PM   #805
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Quote:
Originally Posted by MrMajestic View Post
It looks like both the Buffalo-2 and the IVY III has dual connector possibilities, at least where it can be done. Both 5.08 and 2.54mm connectors can be used, am I correct? Nice if you stack the boards so you can skip running wires.
Yes, that was a customer request and out new standard for input/output connectors.
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Old 6th February 2010, 12:46 PM   #806
muizel is offline muizel  Netherlands
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Hi Brian,

Don't forget to put combo's on th site.

René.
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Old 6th February 2010, 12:53 PM   #807
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I updated the web site last night to (hopefully) cover some of these questions, but here are the answers...

Quote:
Originally Posted by Joshua_G View Post
I intend to preorder and I'd like to be clear about PSU's options.
1. For Buffalo II without any of your IVY's, if I got the picture correct, Buffalo II can use only 1 external PSU, like single-pole Placid and whatever IVY will be used will need it's own PSU. Is that correct?
Yes. In standard form, the Buffalo uses a single 5V input. That feeds three onboard regulators for the digital sections, as well as the AVcc shunt regulator. Each of the supplies can be bypassed by removing a ferrite (for each) and power supplied to each's header.

Quote:
2. Or does Buffalo II requires also double-pole (+/-) PSU for AVCC?
No.

Quote:
3. There is an optional stackable AVCC shunt reg module. Is that correct?
The AVcc module comes with the Buffalo (I am building them as we speak). It is optional in the sense that you could use something else to power AVcc if you wanted.

Quote:
4. The optional stackable AVCC shunt reg module can be powered either from 1 external PSU connected to Buffalo II's VD in, or from 1 external PSU connected directly to the AVCC shunt reg module. Is that correct?
Yes. The AVcc uses a pin header and socket to mount to the DAC. These are not pre-soldered, so you would just not use the pin that connects the module to Vd, then supply power to the header pad externally.

Quote:
5. How many external PSU's can the AVCC shunt reg module utilize?
I believe just one.

Quote:
6. What is/are the expected benefit(s) from the optional stackable AVCC shunt reg module?
Lower noise for the critical analog section of the DAC.
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Old 6th February 2010, 01:20 PM   #808
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Thanks Brian,
I'm still unclear.
1. Is the stackable AVCC shunt reg module included with the Buffalo II as default, or should it be ordered separately?
2. Will the stackable AVCC shunt reg module benefit from an additional PSU, separate from the one feeding Buffalo II?
3. Will there be any benefit from using external quiet PSU's, instead of the 3 onboard regulators?
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Old 6th February 2010, 01:28 PM   #809
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Quote:
Originally Posted by Joshua_G View Post
Thanks Brian,
I'm still unclear.
1. Is the stackable AVCC shunt reg module included with the Buffalo II as default, or should it be ordered separately?
2. Will the stackable AVCC shunt reg module benefit from an additional PSU, separate from the one feeding Buffalo II?
3. Will there be any benefit from using external quiet PSU's, instead of the 3 onboard regulators?
1) Yes its included.

2) Not in any tangible way because it is a shunt regulator that is already pre-regulated (with another shunt regulator if you use placid). It also has excellent PSRR and a very well filtered VREF.

3) Purely subjective. We are in the final stages of design for a little three pin shunt reg that will plug into each of the headers in case people want to go that route.

All of the supplies are important of course, and the approaches taken for each are deliberate, not just convenient.

The most critical supply in the cct is AVCC, and I *VERY* carefully designed the solution there. It is the result of 2 years research and development.

Keep in mind the maximum input voltage for the AVCC module is 5.5V and the minimum is 5V.

Cheers!
Russ
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Last edited by Russ White; 6th February 2010 at 01:31 PM.
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Old 6th February 2010, 01:38 PM   #810
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Also of note, although the AVCC header has four pins, only three are used by our AVCC module.

The AVCC module does not use the DVCC pin. It is there as a convenience to any who might want to use an ESS demo board style AVCC supply (where DVCC is a VREF).

Our AVCC module uses its own low noise VREF, not DVCC.

Cheers!
Russ
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