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

["Leon Heller" <leon.heller@bulldoghome.com>]

----- Original Message ----- 
From: "Philip Covington" <p.covington@gmail.com>
To: "Xylo-SDR Discussion" <xylo-sdr@lists.ae5k.us>
Sent: Monday, December 26, 2005 6:25 PM
Subject: Re: [Xylo-SDR] Wolfson chip interface for S3 and Xylo


> 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.

It would be OK for use with the Softrock, as it already has a low-noise 
op-amp. Another amp may easily be substituted if there is a problem.

Leon