Overview

The LA3410 is a multiplex demodulator IC designed for FM stereo tuner. It features the VCO non-adjusting function that eliminates the need to adjust the free-running frequency of VCO.

Applications

• Home stereos, portable hi-fi sets.

Functions

• VCO non-adjusting function.

• PLL MPX stereo demodulator.

• Gain variable type post amplifier.

• VCO stop function.

• Separation adjust function.

Features

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

• Good temperature characteristic of VCO : ±0.1% typ. for ±50°C change.

• Low distortion at high frequencies in stereo main channel (0.06% at f=10kHz) (Non-adjusting PLL makes the capture range narrower, leading to improvement in beat distortion at high frequencies in stereo main channel.)

• Low distortion : 1kHz 300mV input mono 0.025% typ. main 0.02% typ.

• High S/N : 91dB typ. (mono 300mV input, LPF). 92dB typ. (mono 300mV input, IHF BPF).

• High voltage gain : Approximately 8.5dB (at standard constants).

• Wide dynamic range : Distortion 1.0% at mono 800mV, 1kHz input.

• Good ripple rejection of power supply : 34dB typ.