AD9837 Vout voltage dropt Vs frequency

Hello All, 

I'm trying to test an AD9837 and I don't understand Vout.

At 1Khz, the Vout is 640mVpp. but this Vpp decrease with frequency.

at 5Khz I have 480mVpp

I want to work at 30Khz and at this frequency, the Vout is 142mVpp.

i want to know why I don't have the max rating, 0,6Vpp?

and second question, to amplifie this signal, an Amp op with 1kOhms resistor input is it correct (due to the 200Oms internal resistor for the output)

thank for your helps.

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