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AD9361 phase discontinue when frequence offset is low

Question asked by cloudstone on Mar 12, 2016
Latest reply on Mar 15, 2016 by tlili

I use the AD9361 as RF front of the domodulater, it is set in a AGC mode and   the Rx LO is 390MHz. The IQ data rate is 50MHz.  A 390MHz , -50dBm pure carrier RF with a small frequence offset is fed to the AD9361. When the frequence offset is less than 400Hz. The phase of ADC (both I and Q channel )  output somtimes became discontinue. It does not look like a sine wave. Sometimes it seems jump to the maxim value. But when the offset is higher than 500Hz, the phonomenon disapeared. the ADC output became a pure sine wave again.

What is the problem?