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AFE7950: JESD 204B LMFSHd

Kazuto Odajima
Prodigy 150 points
Part Number: AFE7950

Tool/software:

This is about the JESD parameter LMFSHd.

The AFE7950 has 8 lanes and 4 converters for TX/RX. The resolution is 14 bits.

If LMFSHd=48810, why is F=8?

There are 2 octets (14 bits) per converter, so if M=8, I think F=16.

Please tell me how to think about this.

L = number of lanes for the link
M = number of logical converters
F = number of octets per frame
S = number of samples per frame
Hd = High density

  • 0
    TI__Expert 4865 points

    Hi Kazuto,

    While the ADC has a 14-bit resolution. Because the DDC is basically zooming into the captured bandwidth by filtering. This will filter part of the captured noise leaving you with a higher SNR. Which will lead to having 16-bit resolution after the DDC.

    For the DAC case, while the DAC has 14-bit resolution. Because the DUC is capable of leveraging a 16-bit granularity we provide 16-bits through the JESD interface. This makes it so that the granularity of the DUC is of 16-bits which will then apply to the samples as they pass through it. This then gets limited by the DAC.

    In regards to the LMFSHd question. Where are you seeing the 48810? Maybe you are referring to 88210 or 48410?

    Best,

    Camilo