Programmatically scaling CLKO

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hi, have external chip (ad5933 http://www.analog.com/static/imported-files/data_sheets/ad5933.pdf) interface arduino. ad5933 has own 16 mhz internal oscillator, need clock signals lower well, 4 mhz, 2 mhz, 1 mhz, 250 khz, 100 khz, 50 khz, , 25 khz. though, settle 2 mhz . there no way scale ad5933's internal oscillator. since interfacing ad5933 arduino, know can output arduino's clock changing bit 6 of "low_fuses" per post http://forum.arduino.cc/index.php?topic=148741.0 but, wondering if possible change clock output within arduino sketch since need dynamically change ad5933's clock input (which arduino). arduino responding serial events controlling other functions of ad5933, makes impossible use pwm this. great. thanks.

why not ds1077?

http://datasheets.maximintegrated.com/en/ds/ds1077.pdf


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