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Regarding DS90LV012A

vivek vishwanath
Prodigy 110 points
Other Parts Discussed in Thread: DS90LV012A

I am using DS90LV012A in my design to convert a HCSL input to CMOS output. I have the below queries. The datashheet states that it can have a Vcm in the range of 0.05 to 2.35 volt .  HCSL is ground referenced with a Vcm of 350mV . This is within the limits as specified in the datasheet and hence no AC coupling is required. Is my assumption correct.

The DS90LV012A datasheet also states that the max differential swing is 350mV while for HCSL it 700mV. Hence i need to attenuate the signal by adding a series resistor. What is the value I should choose

  • 0
    TI__Genius 13475 points

    You are correct - there should be no AC coupling required.

    The differential inputs to the DS90LV012A has an internal 100Ohm termination resistor.   What I would do is to add an external network with an additional 100Ohm resistor in parallel with the inputs (dropping the impedance between the two input pins to 50Ohms), and a second, series 50 Ohm resistor, so the transmission line from the HCSL driver still sees a 100Ohm termination.  The result will be an attenuation at the input to the DS90LV012A by a factor of 2, but we will maintain the 100 Ohm termination properties.