The LA1833N/NM is an AM/FM IF and MPX system-on chip IC that supports electronic tuning for home stereo systems. It is optimal for use in auto-seek systems that use SD (station detect) and IF counting in parallel.
• Improvements over the LA1832
— The MPX VCO circuit has been integrated on the same IC (no ceramic element required)
— Built-in adjacent channel interference reduction function (114 kHz, 190 kHz)
— Built-in pilot canceler function (19 kHz)
— AM and FM output levels can be set independently
— Improved FM reception characteristics (IF beating improved)
• Other features
— Pin arrangement nearly identical to that of the LA1832
— AM coil specifications can be the same as those used for the LA1832.
— ST operating dynamic range improved over that of the LA1833
— FM total harmonic distortion detuning characteristics and signal-to-noise ratio improved over those of the LA1833