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DS25CP114: DS25CP114 compatible output drivers

Richard Pitt
Prodigy 90 points
Part Number: DS25CP114
Other Parts Discussed in Thread: LMH0303,

Is the DS25CP114 output suitable for connection to the LMH0303 cable driver.

The differential output of the  DS25CP114 is 350mV with 1.2V Offset, however, this does not seem suitable for input to the LMH0303, could you confirm whether this is suitable or recommend a suitable alternative.

  • 0
    TI__Guru* 92040 points
    Hi Richard,

    There are a couple of ways of interfacing these two devices:

    1). You can AC couple using 4.7uF AC coupling capacitors. In this scheme, we don't have to worry about common mode voltage since input differential voltage is 350mV(LMH0303 minimum swing is 100mV).

    2). DC Coupling: Using 350mV input swing, we have the followings:
    a). LMH0303 max common mode voltage is VCC-(SDI/2). At 350mV, we have 3.3-(.350/2) = 3.125
    b). LMH0303 min common mode voltage is 1.6+(.350/2)=1.775
    c). DS25CP114 Common mode voltage range is 1.2+/-(350/2)= 1.375/1.025
    Given C and comparing to A & B, as you noted we cannot DC couple. So i believe we should AC couple these two devices and please use 4.7uF value caps.

    Regards,,nasser