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DAC/Headphone Amp Design
DAC/Headphone Amp Design
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Old 13th January 2021, 07:07 PM   #1
Kdent is offline Kdent  United States
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Default DAC/Headphone Amp Design

Hello everyone,


I recently designed a dac and headphone amplifier combo and would like some thoughts/suggestions on it.



Much appreciated,


Kaden
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Old 13th January 2021, 09:43 PM   #2
Mark Tillotson is offline Mark Tillotson
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RIGHTINP and RIGHTINM of the TPA6130A2 are both connected to same output of DAC...
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Old 13th January 2021, 11:49 PM   #3
Kdent is offline Kdent  United States
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Quote:
Originally Posted by Mark Tillotson View Post
RIGHTINP and RIGHTINM of the TPA6130A2 are both connected to same output of DAC...

Good eye on that. The ES9023 outputs single ended, so the idea is to run the TPA6130A2 as a non-inverting single ended in, single ended out amplifier since there's no point of converting a single ended output (on the dac) to a differential to go to the amp, then get converted back again to single ended.



Thanks for the point out, I'll get that fixed



Kaden
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Old 14th January 2021, 04:23 AM   #4
jasonhanjk is offline jasonhanjk  Malaysia
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Re-check the DAC datasheet again.

Ground connection should not connect this way. Also the DAC output why there cap to ground?
Vreg short to AVcc?
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Last edited by jasonhanjk; 14th January 2021 at 04:48 AM.
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Old 14th January 2021, 02:32 PM   #5
Kdent is offline Kdent  United States
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Quote:
Originally Posted by jasonhanjk View Post
Re-check the DAC datasheet again.

Ground connection should not connect this way. Also the DAC output why there cap to ground?
Vreg short to AVcc?

I uploaded both the datasheet example and my schematic. They seem to be pretty similar but maybe I made a mistake in the schematic.



This DAC is a voltage-output DAC, so it there will be a little bit of DC voltage. The caps are AC-coupling capacitors to block the DC voltage.


Kaden
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File Type: png Schematic_Headphone Dac_amp_2021-01-14.png (71.4 KB, 162 views)
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Old 14th January 2021, 03:26 PM   #6
jasonhanjk is offline jasonhanjk  Malaysia
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I was hoping you have the complete datasheet. Normally all ground are shorted in 1 location. Datasheet will tell you where to short for best performance.
1st time sees 4.7nF connect to output without any series resistor.
R9 is open, R8 need to read datasheet.
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Old 14th January 2021, 03:40 PM   #7
Kdent is offline Kdent  United States
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Here's the complete datasheet:

https://www.mouser.com/datasheet/2/1...71-1923637.pdf


It mentions separating digital and analog ground for the charge-pump.



Kaden
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Old 14th January 2021, 04:35 PM   #8
bansuri is offline bansuri  Italy
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I only looked at the amp.
https://www.ti.com/lit/ds/symlink/tpa6130a2.pdf
just copy the layout and done.


A bit of action to find 16 ohm headphones, the Mackie only
usually only DJ models are 35-100 ohm, HiFi go up to 600
Anyway for high end not interesting
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Old 15th January 2021, 01:07 AM   #9
jasonhanjk is offline jasonhanjk  Malaysia
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Ok.
So for the Vreg, do follow the datasheet with 2 resistor.
Unmount the one that connects to supply.

You may still want to short both Agnd and Gnd somewhere on the board using resistor.
I recommend using 0 ohm resistor at you star ground. If don't need still can be remove.
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Old 20th January 2021, 02:14 AM   #10
tomchr is offline tomchr  Canada
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The TPA6130 is BGA or QFN only. That will be a bit of a challenge to solder. I recommend setting up a toaster oven for solder reflow. You want an oven that you can sacrifice as I highly doubt the flux residue is healthy to eat. You'll also need OSH Stencils or an QFN stencil that you can get from Digikey.
That said, it is perfectly possible to solder the QFN packages by hand. I've done it a few times. Just don't expect it to work the first time and include enough hooks in the circuit that you can debug it if the soldering doesn't go as planned.

An alternative would be the TPA6120A2. It does have an exposed pad on the bottom which will need soldering, but that's possible with a regular soldering iron if you leave a large enough hole in the board below the pad. An OPA1656 would work too and be easy to solder. Neither of these have a digital volume control, though.

I think you have the MUTE line on the DAC connected incorrectly. The data sheet has the 100 kΩ resistor to VCC.

If you haven't already, I suggest that you go through the documentation for the TPA6130 EVM. There're usually good tips in those. I'd also make sure that you can wiggle the I2C pins on the USB chip.

Neat project. It'll be fun to watch your progress.

Tom
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Last edited by tomchr; 20th January 2021 at 02:16 AM.
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