RE: AD561JN DAC compatibility

Interesting - going back quite a few years for me - going from memory here -
Ceramic packages were used for better moisture resistance, thermal
conductivity and mechanical stability. In very high gain amplifiers, you
could actually induce a piezoelectric effect by squeezing or stressing the
pcb the plastic DIP package was attached - ceramic packaging was the
solution. Also, "parameter shift" for certain specs was greater for plastic
encapsulated versus ceramic packaged parts due to the molding stress that
was applied. But that would not be a factor to an end user as the parts had
already been tested and graded. But then again, over extended time, could
the plastic package stress be a factor?

>From my personal experience, I have not seen a difference on the boards that
I have repaired used vintage plastic or ceramic AD561s - but then my sample
size of a dozen and a half or so could be too small.

I'd be interested in the vintage of the parts that were used. Were they new
or old?

Bill

-----Original Message-----
From: owner-vectorlist@vectorlist.org
[mailto:owner-vectorlist@vectorlist.org] On Behalf Of Ian Eure
Sent: Tuesday, October 30, 2012 9:38 AM
To: vectorlist@vectorlist.org
Subject: Re: VECTOR: AD561JN DAC compatibility

Interesting. Well, I found a source for some cheap AD561JN chips, and I have
a PCB that needs a new X DAC.

I bought one of each, so I'm going to socket the bad location on this board
and try both.

On Oct 30, 2012, at 1:32 AM, Andrew Welburn <andy@andysarcade.net> wrote:

> Yes, however i have found thet the plastic versions can be a little
'noisier' ie, adding spikes to vectors. This might have just been the
particular one or two that i have seen, but i've had to replace plastic ones
with cermaic to fix problems before.
>
> Andrew Welburn
> http://www.andys-arcade.com
>
> On 30/10/2012 05:47, Ian Eure wrote:
>> Has anyone used an AD561JN in a vector board successfully? I poked around
the datasheet, and it looks like the only difference is that JN uses a
plastic housing instead of the ceramic used by the JD chips. They're rated
the same in every other regard, so I assume they will work the same, but I
thought I'd ask to see if anyone has done it.
>>
>>
>>
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Received on Tue Oct 30 11:27:21 2012