Re: [Discuss-gnuradio] 4702 board

[David Bengtson]

Charles:

Where did you find the datasheet for the 4702? I've registered on the 
Microtune web page and found a selection guide, but no data sheet. I'm 
curious as to how you do channel selection on this.

Thanks


Dave


cfk wrote:

> Dear Akshay:
>    Fine, Akshay. Here is the current question. What should the circuitry
> look like between the IfOut1 & IfOut2 pins of the 4702 and the input
> circuitry of the usrb. The "Microtune 4702 RF Frontend" schematic at
> http://www.comsec.com/4702 shows one lone OPA681 going to a BNC. Near as I
> can tell from Burr-Brown, the OPA681 is now obsolete.
>
>    Should we use an OPA691 to drive a MAX2451 Quadrature Demodulator and
> take the I/I-,Q/Q- outputs of the MAX2451 and run them through 4 individual
> OPA691's? Should we use a Quad output opamp? Is there a better chip then the
> MAX2451 to use for the Quadrature decoder.
>
>    I have started the Orcad Capture and am gathering details together, but
> those particular details are the most mysterious right now.
>
> Charles
>
>
>
>
> ----- Original Message -----
> From: "Akshay Mishra" <address@hidden>
> To: <address@hidden>
> Sent: Saturday, February 07, 2004 8:44 PM
> Subject: Re: [Discuss-gnuradio] 4702 board
>
>
>  
>
> > Charles,
> >    I have some little exposure to DSP board design and can provide some
> > assistance on schematic (Orcad) if required.
> >
> > -Akshay.
> > On Sat, Feb 07, 2004 at 08:26:52PM -0800, cfk wrote:
> > |    Maybe Brian can jump in here with his Maxim knowledge and help us out
> > |with the schematic a bit as it fleshes out over the next week or so.
> > |
> > |Charles, WA6LWB
> >
> >
> > _______________________________________________
> > Discuss-gnuradio mailing list
> > address@hidden
> > http://mail.gnu.org/mailman/listinfo/discuss-gnuradio
> >    
>
>
>
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