Need audio converter for speech synthesis and tone generation ( Mono Speaker output )

Hello all,

I have  audio converter requirements for medical device. It will be used in the life-saving medical device. So I am looking for reliable chip ( First time working in the audio  convertor selection )

         I need to choose the audio converter for speech synthesis (To provide auditory commands ) and tone generation (beep or continuous tone)  (Mono Speaker output is prefered). I have checked the TLV320AIC3107  and TLV320AIC3120. 

So I need suggestion to select the best audio converter with Mono Speaker output  (In stereo,One channel will used )

suggest If the any alternative audio converter parts

Kindly share the suggestion

Thanks for the support