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I250U in AD9119

Question asked by daisu on Oct 18, 2013
Latest reply on Nov 4, 2013 by daisu

Hello,

I'd like to ask you about I250U in AD9119.

Q1.
In Figure1 for datasheet, I250U connected 1.2V.
What does it mean?

Q2.
Pls check Figure1 and Figure149.
They have some differences around I250U, VREF and the comparator.
Which is correct?

Q3.
Description for I250U(A1) in the datasheet is the following.
Nominal 1.0 V Reference.
Tie this pin to VSSA via a 4.0 kΩ resistor to generate a 250μA reference
current.
In datasheet, I250U is 1V and VSSA is -1.5V.
Can it generate a 250μA?
If yes, could you please tell a theory for me?

Best regards,

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