How would you explain that the 3rd harmonic is so high with the ADA4841 compared to the AD8065?

My customer received the evaluation board at the beginning of the week and he performed several measures on it with the AD8065 mounted on the evaluation board and with the ADA4841.

Here are the results:

Fe = 384 kHz

F = 95 kHz

1) AD5452 + ADA4841, RLoad = 1 kOhms :

F = 95 kHz, +10.3 dBm

(Fe - 3F) = 99 kHz ---> - 45 dBc

(Fe - 5F) = 91 kHz ---> - 85 dBc

2) AD5452 + AD8065, RLoad = 1 kOhms :

F = 95 kHz, +10.3 dBm

(Fe - 3F) = 99 kHz ---> - 75 dBc

(Fe - 5F) = 91 kHz ---> - 82 dBc

How would you explain that the 3rd harmonic is so high with the ADA4841 compared to the AD8065?

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