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SN75LVCP412 Tx and Rx specs at 3GHz levels

Mark Pearson
Genius 12705 points

(1) What are the voltage levels at 3GHz for Rx & Tx? What the datasheet has is:

Receiver logic (differential): VCMRX, Common-mode voltage 1.6 V; VDiffRX, Differential input voltage PP (f = 150 MHz–300 MHz) range = 200 to 2000 mV/ppdiff

Transmitter logic (differential): DiffVppTX, Differential output voltage PP, (f = 1.5 GHz, D0/D1 = 0), 400min / 525typ / 600max mV/ppd

DiffVppTX_PE, Differential output voltage PP, (f = 1.5 GHz, D0/D1 = 1) 600min / 700typ / 800max mV/ppd

(I would like to see the spec data for these up to 3GHz.)

(2) What is the min that the receiver can tolerate on the input? The datasheet has:

VDiffRX, Differential input voltage PP (f = 150 MHz–300 MHz) range = 200mV/ppdiff minimum

* need the spec up to the 3GHz level

(3) Do you have any test data for max cable length that can be driven? (2meters is indicated in the 2nd page of the datasheet)

.

 

  • 0
    TI__Intellectual 1500 points

     

    Hello Mark,

    1. Voltage levels

      • Receiver Logic: Common Mode Voltage (VCMRX) is 1.6V independent of frequency. Differential Input Voltage PP (VDiffRX) is 200 to 2000 mV/ppdiff (measured in time-domain).  The f = 150 MHz–300 MHz frequency range given in the datasheet is incorrect and needs to be corrected.    

      • Transmitter Logic:  The recommended maximum frequency over which device can be used is 3.0Gbps or 1.5GHz and is in compliance with SATA 3Gbps (or SATA II) standard.  The values for DiffVppTX and DiffVppTX_PE at 1.5GHz  are listed in the datasheet.

    2. The minimum voltage that the receiver can tolerate at the input is 200mV/ppdiff.

    3. The maximum cable length depends upon the specifics of the application and the loss profile of the cable.  We can provide you with an encrypted HSPICE model of the device with which you can determine the actual length using your channel model. Maximum length of 20’’ as mentioned on Page 5 under Input equalization refers to the length of the FR4 PCB trace (from the device to the eSATA connector). The standard eSATA cables available in market are of 1m or 2m length. You may wish to run simulations to find out the supported length for your specific cable.

     

    Best regards,

    Ankur Verma

    High Speed Interface Applications