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How to suppress AD9364 leakage

Category: Software
Product Number: AD9364

I use DDS to generate one channel of cos and one channel of sin signals with both 1MHz, which are transmitted to AD9364 through a digital data interface in LVDS mode. The local oscillator frequency transmitted by AD9364 is 2400MHz, and the image suppression seen on the spectrograph is only 20dB (Figure 1). Moreover, it can be seen that the power is 4dB lower than the manual at 2.4GHz (Figure 2). However, I use Ad9364 for loop testing, and the transmission and reception are consistent (Figure 3), ruling out the interface problem, I don't know how to suppress this leak

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