Re: [Xylo-SDR] Wolfson chip interface for S3 and Xylo

[KD5NWA <kd5nwa@cox.net>]

No virtual ground either, I think it's really needed to get most 
accurate readings, specially around the base band.

At 12:25 PM 12/26/2005, you wrote:
> On 12/26/05, Leon Heller <leon.heller@bulldoghome.com> wrote:
> > I've uploaded my S3 interface for the Wolfson chip to:
> >
> > http://www.geocities.com/leon_heller/adc2.pdf
> >
> > Comments, please.
> >
> > It's not quite complete, I need to add the op-amp -ve supply; I'll simply
> > bias them at 2.5V, to keep things simple.
> >
> > I could easily convert it to a Xylo interface, if anyone is interested.
> >
> > 73, Leon
>
> Isn't a TL082 a little too noisy for the ADC input amp? I think that
> all these high performance ADCs are quite sensitive to the input amps
> used as far as being able to approach the data sheet numbers.  I would
> not stray too much from their data sheet recommendations.
>
> Phil N8VB
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Cecil Bayona
KD5NWA
www.qrpradio.com

"I fail to see why doing the same thing over and over and getting the 
same results every time is insanity: I've almost proved it isn't; 
only a few more tests now and I'm sure results will differ this time ... "