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MC3486: Waveform generation problem

user4862018
Prodigy 20 points
Part Number: MC3486
Other Parts Discussed in Thread: THVD1410, AM26LV32E, THVD1450


Hello there:        

                  When I did not connect the IC, the measured A and / A square waves were normal, but after connecting the signal to the IC, I found that the waveform would be distorted (such as photos),      

                  What should I pay attention to?                       

               The output voltage is a 5Vcc square wave. Is there a recommended IC that can be converted to 3.3V and supplied to the MCU?
             
               Note: There is a 100OHM resistor connected between lines 1A and 1B

                  N

  • 0
    TI__Guru 62920 points

    Hello,

    This looks normal to me. The differential signal amplitude is just reduced due to the additional loading of the 100 Ohm termination resistance. The signal doesn't seem distorted in shape and is still of sufficient amplitude for the receiver to reliably determine its state (high or low).

    Is there a concern you have that I am missing?

    Regards,

    Max

  • 0 in reply to Miguel Robertson
    Prodigy 20 points

    The output voltage is a 5Vcc square wave. Is there a recommended IC that can be converted to 3.3V and supplied to the MCU?

  • 0 in reply to user4862018
    TI__Guru 62920 points

    I understand now.  The simplest solution would be to use a receiver IC whose VCC level can operate at 3.3 V.  If you needed 4 channels, a good choice would be AM26LV32E.  If you just need a single channel, THVD1450 or THVD1410 could be considered.  Or, if you wanted to keep the current transceiver a level shifting IC could be used to translate between the 5-V logic and 3.3-V logic.

    Regards,
    Max