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REF6150: About REF6150 output impedance

Part Number: REF6150
Other Parts Discussed in Thread: REF6125


I am designing a circuit to convert single end signal(Vp2p:5V Bias:2.5V) to differential signal(Vp2p:2V, Bias 1V).

And the SNR requirement is 78 db.

So I need a 2.5v reference voltage with a very low output impedance(<100m ohm). I want to choose REF6150 as 2.5v reference voltage.


Here are the picture I pick up from the datasheet of REF6150

The design simulation say the output impedance is less than 25m ohm.(That is very low value)


But the test result show the output impedance is about 2 ohm(25mV ripple/9mA transient current) in figure 18.



Why is there the output impedance difference between the figure 16 and figure 18?