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Old 27th June 2002, 09:34 PM   #11
tiroth is offline tiroth  United States
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You can hand-solder SSOPs with an iron if you are careful. Tin the pads, load up a small amount of solder on the iron, and just move down the pins w/o worrying about shorts. If you go back with a fine desoldering braid you can remove only the shorts, then resolder anything that has gone open.

Using cold spray to keep the die temperature low is probably not a terrible idea.
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Old 27th June 2002, 09:41 PM   #12
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I've finally tried this method out --

http://www.seattlerobotics.org/encod...6/oven_art.htm

It's very clever, but... it doesn't work. At least, I tried it last night and I just couldn't get the temperature high enough to get the solder to melt properly. It just sort of solidified into a big crumbly block of powdery stuff.

If one _could_ get it to work, this would solve lots of problems for DIYers.

-b
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Old 3rd July 2002, 06:39 AM   #13
dorkus is offline dorkus  United States
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Default best DSD-input DAC?

hmm, so i'm looking to build a new analog board for my Sony SCD-C222ES SACD changer. because Sony was kind enough to put the DAC on the analog board instead of w/the digital circuitry, i even have the option to change the DAC chip entirely. so i'm looking for suggestions... the obvious choices are:

AD1955
BB PCM1738
Crystal CS4397

the stock DAC is a DSD1702. i'm assumming the 3 chips above will offer improved performance over the 1702 but i'm not sure if it's worth the extra implementation hassle.

thoughts?
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Old 3rd July 2002, 12:42 PM   #14
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My opinion is that the "easiest" implementation would be with the CS4397; I've been working with that chip, and combining it with an 8420 as an SRC/de-jitter device; you won't need a receiver, of course. It comes down to how much of a drawback is the built in opamp and I/V converter; if you do everything else right, even the "humble" 4390 can be made to sound better than an SCD777ES on Redbook. I'm using transformer coupling and a NLFB buffer, with balanced outs. Capacitor selection is important, I think; I settled on OSCONs and stacked films for the digital and analog sections with additional small value ceramic on the digital.

I do like the sementated DAC architecture chips from BB, and I'll try that with my own I/V converter next, but a couple of other projects stand in the way. If I was starting from scratch again, I'd probably go that route first, though it will present additional challenges.

In either case, unlike the 4390, a four layer board was inevitable and necessary to get the best performance.

Happy building....


Jon
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Old 15th July 2002, 12:55 PM   #15
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Default Re: Monster DAC from AD AD1955

Quote:
Originally posted by peranders
When I have read the datasheets, Crystal seems to be the leader, followed by AKM but Analog is catching up. The chip has a nice performance despite the "third" place.
Crystal and AKM seem to share a common development center. You will find that most Crystal parts have a very similar or sometimes even 100% functionally identical AKM sister part. The data sheets are most certainly written by different teams who seem to have a completely different philosophy of compiling documents. The measured or guaranteed values are also different. I am not sure whether this is due to different measurement equipment and procedures, different pcb prototyping or even differences in the chip production process.

What Crystal and AKM parts are you referring to that are superior on paper to an AD1955? The CS43122 is hardly on par even with an AD1853.

Eric
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