Re: Fw: [soft_radio] QSD direct to A/D

Tue, 16 May 2006 08:04:53 -0700

Hi Jim

These 9958, 9959 look verry promising but
I am afraid they are impossible to solder
without a reflow process.

Anyone who has used this devices successfully ?

Cheers
Michael

>From: "mdgolfbum" <[EMAIL PROTECTED]>
>Reply-To: [email protected]
>To: [email protected]
>Subject: Re: Fw: [soft_radio] QSD direct to A/D
>Date: Mon, 15 May 2006 17:30:45 -0000
>
>This will be my first attempt using the DDS chips in my "own"
>design. Obviously I'm borrowing from everywhere I can. From what I
>understand the 9958, 9959 are better even with their 10bit vs 14bit
>DACs. I'm going on faith...
>
>BTW, take note of the release date of the datasheet. I was fooled by
>looking only at the rev level. The 9958, 9959 are from late 2005 vs
>2003 or so for some of the other chips.
>
>As far as soldering goes, I don't think AD will go backwards to fine
>pitch leads so it looks like learning to solder the LFCSP is the
>only way to stay up with the latest and greatest.
>
>The conductor does wrap around the side a bit. My first attempt will
>be to do the soldering pin by pin to that area. If necessary I'll
>try the paste and oven approach. I've got an oven I bought just for
>SMD work but haven't yet tried it.
>
>It's only money...
>
>73
>
>jim ab3cv
>
>--- In [email protected], [EMAIL PROTECTED] wrote:
> >
> > Looks like the AD9951 part is gaining in popularity in a dual
> > configuration and I was wondering why the AD9859 part couldn't be
>used in
> > a dual configuration ? Does it not have the same lower spur
>level ?, it's
> > a 10bit DAC, cheaper, etc. I would also think the AD9958 dual part
>offers
> > too many package problems (for me anyway) with it's LFCSP vs the
>other
> > TQFP. Since my applications are digital and I look for the high
>speed
> > comparators like on the AD9952, what's a good external comparator
>to use
> > ?
> >
> > 73 Kees K5BCQ
> >
>
>
>
>





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