well i have reconsidered the IC . Freescale also have a really nice IC . which is truly compatible . it is MC44BS373CA . here is the link
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MC44BS373CA#orderables
It has frequency selection with 250Khz steps for VHF to UHF and has a slightly higher RF Ouput Level . 82dbuV .
The only problem with is the I2C Bus
How in the world i am going to program it using the I2C Bus . It is really complicated . I have to study a lot about I2c . But for now i am preparing for the exams.