which ic should i use from Texas instrument for DSP, ADC and DAC??
Sounds like a failed question.
First off - why do you want to limit yourself to Texas? If there is anything magic with a Texas chip that makes it important for you to select one, then your description of your needs should have specified what that magic was.
Second - DSP? There are some chips that have nothing more than a mul-add function. Then there are chips that have lots and lots and lots of DPS functionality. Your needs haven't been specified.
Third - ADC? How do we know if you need 8-bit or 16-bit, and if you need to sample at 10 Hz or att 100kHz? Or if you need one or eight channels. Or ability to sample negative voltages?
DAC? Yes - exactly the same thing there. We don't know anything about of number of channels, or number of bits or sample rate or other things that may be required.
Besides all above, you haven't said anything about needed computation speed, support for code space. Support for data space. Any need for non-volatile storage. Need for IAP, or debugger interface or a large number of other factors that are normally very important when selecting a chip.
In short: You don't seem to have the faintest idea what your needs are. Then you can't expect anyone else to be able to help you by mentioning any suitable chip.
You (!) - yes, the one sitting behind your keyboard - need to do some form of pre-study to figure out your needs.