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AK4458 multichannel DAC with I2S input
AK4458 multichannel DAC with I2S input
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Old 2nd February 2017, 09:16 AM   #11
zarandok is offline zarandok  Austria
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Just a preconcept....
The problems are the really big Vref caps:
- I can't leave the shunt panels in lying position (if I want to keep the 100x100mm panel size).
- If I use the shunts, I think they will be too big for them to work stable. But I need to make some tests before...
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Old 2nd February 2017, 10:52 AM   #12
Hsmeets is offline Hsmeets  Netherlands
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Originally Posted by zarandok View Post
Yes I have seen... I'l try simple with a pointed soldering iron and soldering paste. Bad idea?
I would use solderpaste and a oven.

Soldering iron, not sure? Depends on the QFN variant AKM uses, it might or might not expose the leads on the side (but very small if it is exposed).
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Old 2nd February 2017, 11:52 AM   #13
zarandok is offline zarandok  Austria
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I'll buy maybe a mini-soldering iron with 0,1mm tip, like: http://www.ersa-shop.com/ersa-l%C3%B...or-p-2859.html But an oven may be good to...
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Old 2nd February 2017, 12:40 PM   #14
fluid is offline fluid  Australia
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Quote:
Originally Posted by zarandok View Post
I'll buy maybe a mini-soldering iron with 0,1mm tip, like: http://www.ersa-shop.com/ersa-l%C3%B...or-p-2859.html But an oven may be good to...
The chip has an exposed pad on the backside which is connected to ground for thermal relief. To solder that you really need an oven or a hot air tool.

You could just put some thermal paste between the pcb and the pad and solder the sides by hand. Looking at the picture of the DAC on the green PCB earlier looks as if the pins go up the sides. I think you could just use lots of flux and drag a ball of solder around to fix it down like a BGA chip. Probably depends on how much practice you have had at doing it or how many chips you are willing to sacrifice to get it right.
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Old 2nd February 2017, 12:48 PM   #15
zarandok is offline zarandok  Austria
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The chip has pins going up the sides!
An idea is to place a 1,5-2mm hole in the middle and heating the thermal paste from the bottom to fix the exposed pad on the backside...
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Last edited by zarandok; 2nd February 2017 at 01:05 PM.
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Old 3rd February 2017, 12:06 AM   #16
fluid is offline fluid  Australia
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Originally Posted by zarandok View Post
The chip has pins going up the sides!
An idea is to place a 1,5-2mm hole in the middle and heating the thermal paste from the bottom to fix the exposed pad on the backside...
Yep that is another option that will work. If you used solder paste under the chip it would still be able to be removed easily but if you used regular solder through the hole it might be harder.

I was meaning to just use regular heat transfer paste like for mounting parts to heatsinks. As the DAC chip has no pins it won't actually stand up above the board height so a thin layer would aid the thermal relief without having to actually be soldered down.
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Old 3rd February 2017, 06:20 AM   #17
zarandok is offline zarandok  Austria
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So where I am not sure that the bottom pad of the chip is only by reason of thermal connection OR must be definitive grounded? The first case would be the easiest (could leave this big hole in the middle)...
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Old 3rd February 2017, 06:53 AM   #18
zarandok is offline zarandok  Austria
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Question: what do you think, should I use the built-in 1,8V LDO or rather an external one?
(or make it switchable...)

Last edited by zarandok; 3rd February 2017 at 06:56 AM.
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Old 3rd February 2017, 06:56 AM   #19
fluid is offline fluid  Australia
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Originally Posted by zarandok View Post
So where I am not sure that the bottom pad of the chip is only by reason of thermal connection OR must be definitive grounded? The first case would be the easiest (could leave this big hole in the middle)...
The datasheet lists two temperature ranges for connected or not connected which is why I thought the pad was for thermal relief only.

AK4458 multichannel DAC with I2S input-screen-shot-2017-02-03-3-52-17-pm-png
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Old 6th February 2017, 08:03 AM   #20
zarandok is offline zarandok  Austria
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Some minor changes... (still w/o copper pour)
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Last edited by zarandok; 6th February 2017 at 08:13 AM.
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