LM5001: Can the LM5001 be externally clocked at 2.1 MHz?

Part Number:LM5001

I'm using the LM5001 at 1.2 MHz and it is interfering with nearby AM radio receivers.  Can the LM5001 be externally clocked at a higher frequency than the published 1.5 MHz?  If not, is there a pin compatible part that can be clocked over 2 MHz?