How about something like the [AD654][1]?  The freq range is 0-500kHz.  It's tunable with an RC pair, where \$ f=\frac {V}{10RC} \$ .  If you can't get the range right, you can always pop a divide-by-10 on the output.


  [1]: http://www.analog.com/static/imported-files/data_sheets/AD654.pdf