Forum Post: RE: LM96551

Hi Mariusz,

For TX circuit I STRONGLY recommend a multilayer PCB. VPP/VNN should be a plane and VPF/VNF should be a splitted plane of VPP and VNN, respectively.

 Regarding your suggestion mentioned above I have one doubt.

I am designing Tx circuit for ultra sound system. I could not understanding " VPP/VNN should be a plane and VPF/VNF should be a splitted plane of VPP and VNN".

Here VPF/VNF = VPP-10/VNN+10 , So for LM96551 , vpf/vnf pins of IC ae connected to VPP/Vnn power rail with capacitor. so how the vpf=vpp-10 and vnf= vnn+10 are derived for the internally?

Here I think no power supply required for vpf,vnf pins just be connected to vpp/vnn power rails Am I right in this sentence.

Thank you very much.

Regards,

chandu.