Audio Controller Integrated Circuits - HK728

 Audio volume controller IC .
 Built in 2 channels in IC body, 
   attenuation can be control by 
   digital signal attached to the 
   strobe ( ST ) , data , clock 
   pins . 
 0 dB ~ 66 dB changing with 2
   2 dB attenuation each step .
 Both of dual power supply of (
   + ) and ( - ) or single power 
   supply can be used .