Overview

The LA3401 is an MPX IC for FM car stereo use. It contains the VCO non-adjusting function, skip noise eliminating function, and pilot cancel function and is packaged in a 16-pin SIP.

Features

• Non-adjusting VCO : Eliminates the need to adjust free running frequency.

• VCO is stable to ambient temperature changes : ±0.1 to 0.15 for ±50°C change.

• Low distortion (0.07 typ./300mV input, mono).

• Good ripple rejection of power supply (35dB typ.).

• Wide operating voltage range (VCC=6.5 to 13V).

• Good space factor due to single-end package.

• Easy to draw printed circuit pattern due to pin-to-pin space of 3mm.

Functions

• VCO non-adjusting function.

• Pilot cancel function (Level follow-up type).

• Stereo noise control function (SNC function).

• High cut control function (HCC function).

• Stereo - monaural automatic select (Pilot input prioritized).

• VCO oscillation stop function.

• Forced monaural function for reception mode (Stereo lamp unlighted, pilot cancel function and HCC function held). This function is provided by disconnecting pin 10 from VCC.