Post Go back to editing

Hi !

For example , ADuM140D/E's supply current is this.

1)

I think this data is 50%-duty.

Is it correct?

2)

And about OOK, I think if I input Low only , oscillator will stop.

So, I will be able to decrease supply current.

Is my understanding is correct?

3)

And if No.2 question is correct, will ADuM14* 's supply current will proportional to DUTY?

4)

And do you have a schedule to release smaller package.

For example ,SSOP or more smaller.

Best regards.

Kawa

• Hi Brian!

These answer will help us very much!

I have few question about datasheet.

1)

What is V15 ?

=> I couldn't understand what 5 is.

2)

What is 1(E0 ,D0), 1(E1,D1)6 ?

=> I think E0,Do,E1,D1 is the device model.

1 and 0 is input signal.

What is 6 ?

3)

And also you said "for at least the lower frequency like 1Mbps" ,

what value is lower frequency ?

Lower than 1Mbps?

4)

And I think the supply current will proportional to frequency?

Best regards.

Kawa

• Kawa:

1. The supply current data is 50% duty cycle (BTW, it also says this above Table 1).

2. For the ADuM14xE1 or ADuM14xD1 versions, the oscillator is off when the input is low and the supply current goes down. The oscillator is off for the ADuM14xD0 or ADuM14xE0 when the input is high and the supply current goes down.

3. Yes, for at least the lower frequency like 1Mbps, the supply current will follow the duty cycle. Using typical 5V IDD1 datasheet Table 1 Quiescent supply current 1.2mA 0% duty, 2.0mA at 100% duty, and Table 2 supply current at 1Mbps of 6.8mA, the attached curve shows the straight line.

4. We will soon release smaller package, the SOIC-N 16 pin narrow body package.

Regards, Brian

• Hi Brian!

Best regards.

Kawa

1. The 5 is a footnote below the table which states:

VI is the voltage input.

2. The 6 is a footnote below the table which states:

3. Lower frequency is 1Mbps or lower.

4. The supply current will be proportional to frequency, like the curve you made.  Other figures of supply current vs data rate are shown in the datasheet.

Regards, Brian

• Hi Brian.

1)

I think the datasheet is wrong.

Best regards.

Kawa

• Hi Brian.

I have another two questions.

I made the graph with 1Mbps and 100Mbps , 0-100% Duty.

2)

Why is there difference between Idd1 and Idd2?

I think ADuM142 has to be same supply current.

3)

Why the supply current increase when Frequency is higher at Duty-50%?

Best regards.

Kawa

• Hi Brian.

Best regards.

Kawa

• Hi Brain.

with my customers and this supply current problem　is critical for them.

Also can you answer why IDD1 and IDD2 is different?

Best regards.

Kawa

• Kawa-san:

You are right - there is a typo in the ADuM14x datasheet. For the Quiescent current tables for the ADuM141 and ADuM142 the Test Conditions for the ADuM140 is correct, the ADuM141 and ADuM142 Conditions need to be changed to match the ADuM140.  We will change this when we next revise the datasheet.

Regards, Brian

• Kawa-san: These curves at 1Mbps and 100Mbps Vs duty cycle do not look right.  I will review these with the designer and respond back to you.

Regards, Brian