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SN75LVPE5412: inquiry of EQ boost

Part Number: SN75LVPE5412
Other Parts Discussed in Thread: DS160PR410

Tool/software:

hello 

We are comparing and evaluating ds160pr410 and SN75LVPE5412. We made an evaluation board with the same input and output loss and evaluated it.

We set the DS160 EQ index to 29 and the SN75 EQ index to 19 (both DC gain set to 0dB).

At 8GHz, the gain of DS160PR410 is about 2.5dB higher than that of SN75LVPE5412. The frequency characteristics of SN75LVPE5412 (EQ index 19) are similar to those of DS160PR410 (EQ index 23-24).

Is this the correct result?

The data sheet shows that both have a similar gain of 17dB at 8GHz, so I'm asking.

  • Hi Minho,

    I believe your measurement is correct. DS160PR410 is 16Gbps and thus would have a higher gain at 8GHz vs a 32Gbps(16GHz Nyquist) device(SN75LVPE5412. Please note DS160PR410 data sheet graph has de-embedded trace on the output of the device. On the other hand, SN75LVPE5412 this trace is not de-embedded. If possible. please let us know your application for these devices. If you like, you can send me friend request if this is confidential.

    Regards, Nasser

    Regards, Nasser

    1. Can you explain the comparison between Table 6-2 in the SN75LVPE5412 datasheet and Table 1 in the DS160PR410 datasheet? The gain at 8GHz listed in the datasheets appears to be the same. (I understand the explanation related to the Nyquist frequency.)

    2. Does it mean that the graph(Figure 1.) in the DS160PR410 datasheet is de-embedded, while the graph(Figure 5-1.) in the SN75LVPE5412 is not?

  • Hi Minho,

    Normally device by itself has - this is at the output pin of the device - 4-5dB gain at the lowest EQ index settings. Figure 5-1 shows about 4-5dB gain while figure 1 shows 0dB. Your understanding - comment #2 above - is correct. Reading my earlier comments above, actually it is the other way around. SN75LVPE5412 is de-embedded while DS160PR410 is de-embedded - as you noted. Apologize for confusion here. The same argument is true for table 6-2 and table 1 as well.

    Regards, Nasser

  • Thank you. If I summarize what you said, it is as follows, and please confirm it for the last time

    1. DS160PR410's table and graph are not de-embedded (including input and output loss). Although EQ0 is not expressed in the Figure1, you can see that the gain is close to 0 at EQ index 0 (actually has a gain of 4-5 dB) when you check the table 1.

    2. The table6-2 and Figure5-1 of SN75LVPE5412 are de-embedded (gain at the output pin of the device excluding input and output loss). If you check the graph and table, the gain is 4-5 dB at EQ index 0.

  • Hi Minho,

    Your understanding or #1 and 2 comments are correct. 

    Regards, Nasser