TMS320F280049: PGAx_OF can be cascaded to other PGAx_IN ?

Part Number:TMS320F280049

Dear all

I have some questions about F280049RSH,

1) I want to get gain 36x, so can I set gain of PGA1 to 6x, and gain of PGA2 to 6x, then I cascade PGA1_OF to PGA2_IN?

2) the output of the sensor is differential output, is there the measurement to be inputted by PGAx? is it possible to combine two PGAx to one PGA with the differential input?

3) if F280049 need connect ADS7946, the frequency of sck for ADS7946 is up to 80MHz, wether the GPIO of F280049 is supported?

thanks!

Br

jjl