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Hi !

Our customer are using AD8027 as voltage follower .

When they change load resistance , output voltage looks change.

So they want to know how output voltage changes when the load current changes.

Can you show us the Load current vs Output voltage graph or something?

It is OK even if the graph is only typical.

They want to think which value would they use for load resistance.

Best regards.

Kawa

• Hi Kawa,

There is a very good representation of AD8027's Output Voltage vs. Load Resistance in figure 50 of the the datasheet.

I hope this data will suffice. Thanks.

Regards,

Jino

• Hi Jino.

Can you show how you measured this graph?

Can you give your test circuit to measure this?

Best regards.

Kawa

• Hi Jino

Q1)

So I think this circuit can measure only the source side.

Is my understanding correct?

To measure sink side, you have to input 0V.

Is my understanding correct?

Q2)

What do you mean "LOAD RESISTANCE TIED TO MIDSUPPLY"?

Best regards,

Kawa

• Hi Kawa,

Here it is. Rload value is swept.

At + 5V supply, an RLOAD of less than 100ohms will result to a drastic decrease in the VOH and VOL of the part.

Regards,

Jino

• Hi Jino

So you mean the circuit you attached is just for ±5V supply?

Best regards.

Kawa

• Hi Kawa,

Q1. It can also measure the sink side. That will depend on the input, in that circuit I only have the source side but it will work on sink side as well.

Q2. For + 5V supply, connect it to ground. For +5V, at 2.5V or Vs/2.

Regards,

Jino

• Hi Jino

So when our customer are using 5V, the circuit will be this.

Is this correct?

Is Fugure50's tempeture is 25deg only?

Do you have some data for MIN to MAX temp?

Best regards,

Kawa

• Hi Kawa,

Yes. The test circuit is only for +5V.

Regards.

• Hi Jino.

Can you check the circuit image that I attached?

Best regards

Kawa

• Hi Jino

Thank you for your support !

Q1)

So is the circuit I attached is OK to measure Figure50 with single supply operations?

Yes ? or NO ?

Q2)

Q3)

I want to know that Figure 51 measurement result is Typ temperature.

Yes ? or no?

Q4)

If Figure51 is only for Typ-temp(25deg), do you have -40 to 125 deg result?

Best regards.

Kawa