If your Baseband Bandwidth (I'm assuming you're using IQ Mode) is up to 300MHz then I would be concerned about the 2*RF-8*LO (LO frequency referenced from ADMV1014 LO ports) frequency at 600 MHz. The datasheet spur table suggests that this would be approximately 60dBc lower than the main baseband output. Even so the Mini Circuits filter has a very poor VSWR (~12) at 600MHz and all the power at 600MHz will be reflected back into the part. If you already have these filters then I would strongly recommended adding a 3dB or even better 6dB attenuator in line between the filter the and IQ pins.
Thanks for your detailed reply!
I am indeed using IQ mode. What happens to the power reflected back to the ADMV I/Q pins? Is it absorbed internally?
The reflected signal will be absorbed back in to the part. There is a BB amplifier after the mixer so there is less chance of self mixing and degrading the DC offsets.
However, the reflected signal could degrade the SNR and impact the common mode voltage generation circuitry on the BB amplifiers.