Re: AD561JN DAC compatibility

Following up on this, I got around to swapping the bad DAC on this Asteroids board. Here it is running the AD561JN on the X circuit:

http://i.imgur.com/4bA9x.jpg

I believe this is perfectly acceptable. I also purchased an AD561J to compare against, but unfortunately it appears to be defective, with instability on the far right edge of the image: http://i.imgur.com/q8LH0.jpg

The only thing I note with the JN vs. 561J is that the JN seems to output a somewhat smaller image, though it is correctable with the X trimmer pot, and could be due to differences from one production run to another.

On Oct 30, 2012, at 7:37 AM, Ian Eure wrote:

> 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 Fri Nov 30 01:13:48 2012