Overview
The LA1806 is a characteristics-improved version of the LA1811, with the same pin assignment and package as those o the LA1811. Improvements are made on the following points:
.Separation (35 dB→48 dB) and its dependence on free-running frequency (Refer to the separate catalog of the LA1805.)
.FM main distortion (0.8%→0.45%)
.AM detection output (approximately 5 dB increased) The constants on five external parts are changed as LA1811

Functions
.FM-IF: IF amplifier quadrature detector, soft muting, tuning indicator
. MPX: PLL stereo decoder, stereo indicator, forced monaural, VCO stop
. AM: RF amplifier, MIX, OSC (with ALC), IF amplifier, detector, AGC, tuning indicator

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