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Old 22nd January 2013, 04:17 PM   #151
glt is offline glt  United States
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Quote:
Originally Posted by KlipschKid View Post
...
With the 125Mhz clock, the 12R drops 3.2V from the unregulated voltage of 10.7V, so that means the wm8805 + DAC's digital use 266mA with a 125Mhz clock.

At the other extreme, the 12R drops 1.51V from 11.8V = 126mA with a 22.5792Mhz clock.

I was really surprised by the difference so I double checked those voltages - they are correct. I know the wm8805 board uses 70mA so we have a 56mA to 196mA range just by changing the clock. This is at 3.76V AVCC, which is independent . 196mA is close to the ADP151 limit so the 125Mhz clock is risky.

...
That is too close to max current of the ADP regulator. With a 100 Mhz clock, the current would be around 160 mA. Perhaps it is a good idea to have two regulators (right and left) feeding the 1.2v core supply

There is also the increased temperature in the DAC chip

Which 8805 module are you using?
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Last edited by glt; 22nd January 2013 at 04:28 PM.
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Old 22nd January 2013, 08:38 PM   #152
glt is offline glt  United States
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There is also the additional power requirement if playing higher sample rate material.

I had measured the current consumption for the BII-80 and there is a 30 mA increase (total current for the board) if playing 192K vs playing 44.1K
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Old 23rd January 2013, 01:03 AM   #153
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Yeah, it seems I should not go over 50Mhz for the adp's sake, or use an ADP7104 (15uV noise) that can handle 500mA.

The WM8805 is some "crap" I got on Taobao that I spent a week "fixing" so it works really well, and damn, it sounds great with this DAC and a Crystek.

WM8805 多功能解码接收切换板 带8种音频数据输出格式-淘宝网

I want to feed the spdif from the CM6631A into the Wolson so I can isolate it. The CM6631A output is CMOS or TTL so I'm using a potential divider to drop the levels so the wm8805 can get a lock. I've done this with a CM6631, no problems. The CM6631A is not the same it seems because its volume is 6dB higher. So get distortion unless I turn the volume down -6dB in Foobar.

Any idea how I can solve this issue ? It can't be bit-depth issues because 16 to 24 is 8 bits which is far more than 6dB. I think it must be either the firmware or the driver ?
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Old 23rd January 2013, 01:14 AM   #154
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Quote:
Originally Posted by KlipschKid View Post
The WM8805 is some "crap" I got on Taobao that I spent a week "fixing" so it works really well, and damn, it sounds great with this DAC and a Crystek.

WM8805 多功能解码接收切换板 带8种音频数据输出格式-淘宝网
That Taobao guy (who lives in JiaXing) is the OEM behind Raindrop_hui (if you hadn't figured that out already)
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Old 23rd January 2013, 01:24 AM   #155
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Hi,

Yes, I have bought a couple of things from these guys. The Wolfson is the only thing I've kept. I found it on Ebay - it's been redesigned.

Multi-input/converter module for DAC 8805X-J | eBay

Any ideas about how to fix spdif volume problems ? (other than damage the data by using a PC-based 16 bit volume control...)
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Old 23rd January 2013, 01:28 AM   #156
qusp is offline qusp  Australia
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I did mention all of this current/power consumption vs clock speed ages ago, but nooo qusp only posts negative useless information....

assuming that your regulator outputs its max datasheet current rating in your usage is also a bad assumption
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Old 23rd January 2013, 01:29 AM   #157
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What do you mean by spdif volume problems?

Ah you mean you've got 6dB too much gain? Shifting the phase of the WS by one BCK cycle will divide by 2 - use a flip-flop.
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Last edited by abraxalito; 23rd January 2013 at 01:31 AM.
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Old 23rd January 2013, 01:40 AM   #158
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Thanks. I'm trying to avoid more ICs but I guess that's the only way, unless the seller changes the firmware/driver to fix the problem....
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Old 23rd January 2013, 02:11 AM   #159
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I should explain - if I add another IC, it will be a demux/mux switch for the i2s so I can auto switch between the wolfson and cm6631. Plug in the usb and it switches to usb...

3B20 4Channel 2:1 Mux/DeMux Switch IC 16pin TSSOP QTY-1 | eBay

but I'd rather just feed the isolated spdif into the wolfson w/o issues so no extra ICs.
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Old 23rd January 2013, 03:39 AM   #160
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Fixed the problem - register setting on the WM8805, and nothing to do with CM6631.
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