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DS90UB954-Q1: BCC setting &PoC recommended circuitry for 4G FPD-LINK III

Lin Sen
Intellectual 260 points
Part Number: DS90UB954-Q1
Other Parts Discussed in Thread: DS90UB953-Q1

Hi，

In spec, there is a recommended circuitry for 4G FPD-LINK III, in Figure41. At the same time, it is said ' consisting of DS90UB953-Q1 and DS90UB954-Q1 pair with the bidirectional channel operating at 50 Mbps (½ fBCC = 25 MHz) and the forward channel operating at 4.16 Gbps (fFC ≈ 2.1 GHz)'.

I would love to know if the BCC setting 50Mbps MANDATORY? Can we set BCC as 25M, and keep the same circuitry?

Thank you very much and look forward to hearing from you soon.

/Sen

  • 0
    TI__Expert 5480 points
    Hi Lin,

    If you look at the 960 d/s, the PoC filter provided in Figure 40 of the 960 datasheet ensure impedance above 1kohm for the frequency range between ~10 MHz and more than 3 GHz. If you drop the 1/2 BCC to 12.5 Mhz it should still be covered within this band, so there will be no need to change the circuitry. The link below shows a thread with a similar question as yours.

    e2e.ti.com/.../755695