I am thinking of using the AD831 in an Image Reject Mixer application.
Is there an application circuit available from ADI that I can use to achieve this please.
The Mixer is to be used to convert an RFin of 156MHz - 162MHz to an IF of 30MHz.
Sorry we don't have a specific application note for image reject mixer. Basically you need two of these mixers and feed them with I and Q signals. The differential output should be summed in that case. There should be a lot of resources available online showing how to use differential mixer for image rejection.