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WM8740 single power supply output buffer
WM8740 single power supply output buffer
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Old 15th June 2017, 09:07 PM   #1
zdr is offline zdr  Belgium
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Default WM8740 single power supply output buffer

I am looking for recommendations for single supply (5V) compact output buffer for WM8740 which has differential voltage outputs. I could not find any specs for these signals, but I am guessing they must be between 0 and 5V, which is the power supply of the DAC. I would like to run whole board (USB->Audio Widget->I2S->ADAU1701 DSP->I2S->WM8740 on USB power.
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Old 16th June 2017, 02:00 AM   #2
didiet78 is offline didiet78  Indonesia
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Why not take one output?
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Old 16th June 2017, 03:19 AM   #3
chris719 is offline chris719  United States
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WM8740 single power supply output buffer
Not for sale yet I think, but the lazy (minimum component) approach for single supply headphone drive.

http://www.akm.com/akm/en/file/datasheet/AK4205EN.pdf
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Old 16th June 2017, 08:12 AM   #4
zdr is offline zdr  Belgium
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Quote:
Originally Posted by didiet78 View Post
Why not take one output?
Now that you mentioned it, do I need a buffer at all in that case? WM8740 already has a low pass filter embedded...
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Old 16th June 2017, 08:25 AM   #5
Mayday is offline Mayday  Sweden
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WM8740 single power supply output buffer
Just a thought, it isn't possible to use an AD8606 as buffer? It is one already working on a 5Vdc supply on the boards, so that should not be an issue?
There are several other low supply voltage opamps, I don't know how they behave on a single supply though.
I have some, don't remember which though, I'd have to check my parts-drawers and look at the datasheets.
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Old 16th June 2017, 09:05 AM   #6
didiet78 is offline didiet78  Indonesia
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Quote:
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Now that you mentioned it, do I need a buffer at all in that case? WM8740 already has a low pass filter embedded...

If you need 2vrms out, you need diff output.
First, try single ended out with just cap for dc blocking
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Old 16th June 2017, 09:13 AM   #7
chris719 is offline chris719  United States
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WM8740 single power supply output buffer
I would not bother with single supply if you're going for "high-end". Look into Jens' SilentSwitcher to get a negative supply from the 5V input. Or build your own using similar ICs if you're up for it.

If you want excellent load drive capabilities I would look at OPA1622.
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Old 17th June 2017, 10:37 PM   #8
zdr is offline zdr  Belgium
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This one should work on single supply with output cap added:

DAC with WM8740

unless I am missing something.
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Old 18th June 2017, 09:11 PM   #9
zdr is offline zdr  Belgium
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Quote:
Originally Posted by didiet78 View Post
If you need 2vrms out, you need diff output.
First, try single ended out with just cap for dc blocking
Not really, Adau1701 dacs already have 0.9vrms and sound great.

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