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(ADuM140E1)Supply current.

donadona999s
on Jul 31, 2017

Hi !

Q1)

Our customer want to know the supply current.

I already asked about this and you gave me ADuM142's spread sheet.

(ADuM140)Supply current with OOK. 

Can you give me the same thing for ADuM140?

Q2)

Also , ADI's newest iCoupler series is very difficult to calculate the supply power.

Do you have any plan to update the datasheet or make a new application note for this?


Best regards

Kawa

ADuM142typicalsupplycurrentwithdutycycleNov22015.xlsx
  • 0 on Aug 1, 2017 4:39 PM

    Hi Brian-san

    Thank you for your reply.

    We have not receive these questions from our customer yet.

    But I think they will ask this to us in future.

    So I am not hurrying that much but if you can help us about this, the information will be very useful.


    Best regards

    Kawa

  • 0
    •  Analog Employees 
    on Aug 2, 2017 2:38 AM

    Kawa-san: I will discuss with the designer and respond back.

    Regards, Brian

  • 0 on Aug 2, 2017 2:26 PM

    Hi Brian-san

    Thank you for your reply.

    I understood what you wrote and I think your information is very useful.

    If I have more questions about this , I will ask you later .

    Best regards

    Kawa

  • 0
    •  Analog Employees 
    on Aug 3, 2017 12:26 AM

    Kawa-san:

    I will show you here the formula for supply current from the designer.  I will be away on vacation for 1 week, but since you say it is not urgent perhaps you may ask your follow up questions when I return after August 10th.

    Regards, Brian

    ADuM14x IDD1 Calculation: IDD1 = IDD1(Q) + num_of_in_vdd1*(2.8mA*D + 0.01mA/Mbps*Mbps ) + num_of_out_vdd1* 0.02mA/Mbps*Mbps
    ADuM14x IDD2 Calculation: IDD2 = IDD2(Q) + num_of_in_vdd2*(3.4mA*D + 0.01mA/Mbps*Mbps ) + num_of_out_vdd2 * 0.02mA/Mbps*Mbps
    where 2.8mA = continuous oscillator on current of top coil
    where 3.4mA = continuous oscillator on current of bottom coil
    D = oscillator duty cycle
    IDDI(D) = 0.01mA/Mbps = dynamic input current
    IDDO(D) = 0.02mA/Mbps = dynamic output current

    Variables

    Definition

    ADuM140

    ADuM142

    Num_of_in_vdd1

        num of input on VDD1 side

    4

    2

    Num_of_out_vdd1

        num of output on VDD1 side

    0

    2

    Num_of_in_vdd2

            num of input on VDD2 side

    0

    2

    Num_of_out_vdd2: 

         num of output on VDD2 side

    4

    2