ADM2682E unnecessary “L” output

I am FAE in Japanese distributor.

Our customer evaluate ADM2682E and found unnecessary “L” output.

Please see figure1, Figure2 and Figure3.

Could you tell me why RXD output unnecessary “L” ?

PDF

Best regards

N.Kokubo

Parents
  • +1
    •  Analog Employees 
    on Mar 29, 2021 8:45 AM

    This behavior is related to the dv/dt of the A/B waveform when the driver changes from output H state to high impedance (which happens on the falling edge of the DE signal) 

    This unnecessary L output can be removed by placing a 1nF capacitor between the A and B pins of the ADM2682E driver. In many applications, the inherent capacitance of the bus cable will be more than 1nF and a discrete capacitor may not be needed, 

    Regards,

    Neil 

Reply
  • +1
    •  Analog Employees 
    on Mar 29, 2021 8:45 AM

    This behavior is related to the dv/dt of the A/B waveform when the driver changes from output H state to high impedance (which happens on the falling edge of the DE signal) 

    This unnecessary L output can be removed by placing a 1nF capacitor between the A and B pins of the ADM2682E driver. In many applications, the inherent capacitance of the bus cable will be more than 1nF and a discrete capacitor may not be needed, 

    Regards,

    Neil 

Children