[Hackrf-dev] RF path: replacing MAX5864 with MAX5865

[Michael Ossmann]

Frank,

I've tried without success to disable the baseband filter.  If it works for
you, please let me know how you did it.

Thanks,

Michael


On Tue, Sep 19, 2017 at 05:53:56PM -0700, Frank Liu wrote:
>
> Thanks for the quick reply! For the MAX2837, we were actually thinking of
> just disabling the baseband filter via the LPF register. We'll be operating
> in transmit mode for most of the time anyway, and we can apply digital
> filters to any received signals we need to clean up.
> 
> --Frank
> 
> On Tue, Sep 19, 2017 at 10:39 AM, Michael Ossmann <mike at ossmann.com> wrote:
> 
> > Frank,
> >
> > Yes, you can replace MAX5864 with MAX5865.  However, you may still run into
> > bandwidth limitations from the MAX2837 (31 MHz maximum baseband filter
> > bandwidth) and SGPIO (our implementation tops out at about 25 Msps).
> >
> > Michael
> >
> >
> > On Mon, Sep 18, 2017 at 06:58:19PM -0700, Frank Liu wrote:
> > >
> > > Hey folks,
> > >
> > > We're hoping to extend the existing HackRF design to support a wider
> > > bandwidth. Looking at datasheets, it seems that we can simply replace the
> > > MAX5864 (22Msps) with a MAX5865 (40Msps) with pretty much no change in
> > > hardware design.
> > >
> > > Was wondering if anybody had tried this already. Our HackRF will be
> > > "standalone", meaning that we won't be constrained by USB2.0's I/O speed.
> > >
> > > Thanks!
> >
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> >
> >