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  • TI Thinks Resolved

DS10BR150: Unused pin and output voltage with external termination resister

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Replies: 3

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Part Number: DS10BR150

Hi

 

Our customer is considering the one of the below and therefore would like to use same layout.

 

DS25BR110

DS25BR120

DS10BR150  

DS25BR100  

DS25BR150  

 

 

1pin and 4pin of DS10BR150 / DS25BR150 are NC.

Are there any issues if these pins were connected to GND or VCC ?

 

All the above 5 products could output 350 mV with external 100 ohm termination resister ?

Our customer assume it would be OK because the datasheet describe differential output voltage is 350 mV with test condition RL = 100 ohm.

Thank you and best regards,

Michiaki

  • Hi Michiaki,

    There is no issue connecting the NC pins to GND or VCC.

    With a RLoad = 100 Ohms the peak to peak voltage measured across the load will be 700mV.  Each pin (OUTP and OUTN) individually has a 350mV output swing.  Since they are differential the swings are 180 degrees out of phase.  The resulting waveform OUTP - OUTN will be a 700mV waveform if measured by an oscilloscope.

    Regards,

    Lee

  • In reply to Lee Sledjeski:

    Hi

     

    Please let me make sure why differential voltage is 700mV.

     

    Customer thinks that the differential voltage would be 175mV due to be connected internal 100 ohm with external 100 ohm with parallels.(=3.5mA * 100 ohm // 100 ohm).

     

    I would much appreciate you double check why it is 2*350mV.

     

    Thank you and best regards,

    Michiaki

  • In reply to Michiaki Tanii:

    Hi Michiaki,

    The attached graphic shows the output amplitudes of the DS25BRxxx devices.

    Regards,

    Lee

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