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Old 3rd June 2009, 06:31 AM   #1
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Default NOS Dac stacking

1541's and 1543 nos chips I've seen in multiple stacked arangments in dacs.

My question is this...

can the AD1865 chip be stacked? has anyone already done so?


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Old 3rd June 2009, 12:36 PM   #2
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Every chip that has Iout can be stacked.
But be sure to know which pins must be paralleled and which ones must not.
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Old 1st April 2012, 12:09 AM   #3
gupsta is offline gupsta  United Kingdom
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I too am interested in this, how it might be acheived, has any tried it already ? I'm guessing its going to be more complicated than the tda1543 towers ?
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Old 1st April 2012, 01:41 AM   #4
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As Bernhard points out, you can stack the AD1865 if you're using the current outputs (that's pins 4,21). Don't use the internal opamps, choose a suitable external I/V stage. I'd not parallel the Trim and MSB pins (2,3, 22 & 23) or the internal opamp connections (6,7,8,17,18 & 19) but all other pins should be good to stack.
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Old 1st April 2012, 02:27 PM   #5
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Definitelly stacking would have to leave out the internal OpAmps and the trimming part. The cips work with nothing connected to trim terminals.
Now... in my experience (PCM61P) trimming reduced visibly (on spectrum analyzer) the 2nd and 3rd harmonics - it was like 4-6db for each. Didn't really took screen grabs so don't hold me to it.
I think is more than stacking up to 4 can do.

Last edited by SoNic_real_one; 1st April 2012 at 02:30 PM.
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Old 1st April 2012, 07:09 PM   #6
gupsta is offline gupsta  United Kingdom
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Thanks, this is the schematic for the DAC and DOS. I'm guessing I would need to change some resistors.

https://skydrive.live.com/?cid=6a26b...D70C940478!150
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Old 1st April 2012, 07:29 PM   #7
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Yep, the trimming option is not used anyway.
The resistors series with data signals would have to be reduced (even zero is OK). The I/V stage with resistor is crap IMO, but definitely paralleling the IC's with reducing the value of resistor would help.
BTW: At U5, -ROUT is incorrect connected.
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Old 3rd April 2012, 04:32 AM   #8
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Quote:
Originally Posted by gupsta View Post
Thanks, this is the schematic for the DAC and DOS. I'm guessing I would need to change some resistors.

https://skydrive.live.com/?cid=6a26b...D70C940478!150
once you get your final schematic figure out would you mind if I used it to create a DAC?
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Old 7th April 2012, 08:12 AM   #9
gupsta is offline gupsta  United Kingdom
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It's not my schematic, I purchased the dac off ebay.
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