DESCRIPTION
The SA1021 integrated radio receiver circuit is for portable radios, stereo as well as mono, where a minimum of periphery is important in terms  of  small  dimensions  and  low  cost.  It  is  fully  compatible  for applications using the low-voltage micro tuning system (MTS). The IC has  a  frequency  locked  loop  (FLL)  system  with  an  intermediate frequency  of  76kHz.  The  selectivity is  obtained  by active  RC  filters. The  only  function  to  be  tuned  is  the  resonant  frequency  of  the oscillator.Interstation  noise  as  well  as  noise  from  receiving  weak signals is reduced by a correlation mute system.

FEATURES
* RF input stage
* Local oscillator
* Frequency detector
* MTS compatible
* Internal reference circuit
* Field-strength dependent channel separation control facility.
* Mixer
* IF amplifier/limiter
* Mute circuit
* Loop amplifier
* LF amplifier for  mono earphone amplifier or MUX filter