ADG5412BF have an internal oscillator?

Dear all,

In my prototype board, where there are a lot of ADG5412BF devices, in the D2 (or S1, the switch 1 is closed) pins there is an oscillation of about 48/49 MHz of frequency and 50 mVpp. Is possible that the devices produce itself this oscillation? The power supplies (+ - 7.3 V) are free from this oscillation.

Thank you
Davide Badoni