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DS90UB921-Q1: AC couple capacitor selection

Rory Wu
Intellectual 1050 points
Part Number: DS90UB921-Q1

Hi Team,

My customer asked if they can use other value rather than 330nF for C1, like 220nF. Because the supply of 330nF cap was not good. And  whether they can use 10V or 16V voltage rating cap(with 7V POC supply) instead of 50V in the D/S?

Could you please help here? Thanks. BR,

Rory

  • 0
    TI__Guru** 103215 points

    Hello Rory,

    0.1uF caps would be acceptable for 921 as well and may have better supply. It is suggested to select 50V rated caps to avoid any significant derating under DC bias especially for PoC applications. 

    Also for coax configuration the DOUT+ cap should be 0.1uF and the DOUT- cap should be 47nF 

    Best Regards,

    Casey