Overview
The LA1805 is a characteristics-improved version of the LA1810, with the same pin assignment and package as those of the LA1810. Improvements are made on the following point :
• Separation (35dB→48dB) and its dependence on free running frequency (Sep – fF Characteristic on page 4).
• FM main distortion (0.8%→0.45%).
• AM detection output (approximately 5dB increased).
   The constants on five external parts are changed as shown on page 10.
  
Features
• FM/AM/MPX functions contained on a single chip.
• Minimum number of external parts required.
• On-chip FM muting function.
• High sensitivity.
• Less carrier leak of MPX.