AD9434 driven with a VGA

Hi.  I would like to use the AD9434 (500 MSPS) with a variable gain front-end.  The input signal is broadband with relevant content between 5 MHz and 250 MHz.  The LPF before the ADC should be a 3rd or 4th order Bessel.  Two channels will run in parallel so the ADL5202 dual VGA seems like a good fit.

Is there an appropriate reference design I could get started with (e.g. VGA --> Bessel LPF --> high-speed ADC)?

Are there filter design application notes or software that would help with the Bessel filter design?


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