Features
1. On-chip IF count buffer circuit and microprocessor
   controlled switch circuit for ETR.
2. Compared to the LA1140, the LA1145, 1145M offer:
   1 Improved signal meter output linearity;
   2 Improved band mute temperature stability;
   3 Improved S/N ratio;
   4 Improved sound quality at weak signal input when    noise is present, and;
   5 Improved AMR characteristics during weak signal    input.
3. Reduced parts’ count simplifies design:
   1 On-chip IF count buffer circuit;
   2 On-chip SD circuit — sensitivity can be set
      independently of soft mute characteristics, and;
   3 Variable S-meter gradient — three pin S-meter output
      (pins 5, 16 and 17) facilitates independent control of
      SNC and HCC.