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ADC34RF52: JESD204B LaneRate

Hidemi Matsumura
Prodigy 40 points
Part Number: ADC34RF52

I am trying to calculate Lanerate when using ADC34RF52.
- L: number of lanes per link
- M: number of converters per device
- F: number of octets per frame clock period
- S: number of samples per frame
-Fs: sampling clock

The formula for calculating Lanerate would be
Lanerate = Fs × M × 8bit × F / S / L

Table 7-29. JESD Sample Frame Assembly: Bypass Mode
I plan to apply LMFS=8422.
fserdes=Lanerate?

Also,
Table 7-30. JESD Mode Options: Real Decimation D=4 LMFS=8422,
What is the formula for calculating Lanerate?
Lanerate = (Fs/D) × M × 8bit × F / S / L

  • 0
    TI__Mastermind 23780 points

    Hi Hidemi,

    In the ADC3xRF5x datasheets, we are trying to ease the lanerate calculations for users by providing a RATIO column in the JESD Mode Options tables. (see below example)

    For bypass LMFS=8422, the ratio is 10, so if sampling at 1.3GSPS, Fserdes = Fs * 10 = 13Gbps

    For decimation by 4 LMFS=8422, the ratio is 10 as well. But now, you have to incorporate the decimation factor into the equation as: Fserdes = Fs / D * 10 . So if sampling at 1.5GSPS now instead of 1.3GSPS, and decimating by 4, the equation is: Fserdes = 1.5GSPS / 4 * 10 = 3.75Gbps.

    Regards, Chase