(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 donadona999s 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
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 ADIApproved

on Aug 2, 2017 2:38 AM
Kawa-san: I will discuss with the designer and respond back.

Regards, Brian
Cancel
Up 0 Down

Reply

Verify Answer

Cancel
0 donadona999s 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
Cancel
Up 0 Down

Reply

Verify Answer

Cancel

0 ADIApproved

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(2.8mAD + 0.01mA/MbpsMbps ) + num_of_out_vdd1 0.02mA/Mbps*Mbps
ADuM14x IDD2 Calculation:	IDD2 = IDD2(Q) + num_of_in_vdd2(3.4mAD + 0.01mA/MbpsMbps ) + 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