Overview

The LA1193M and LA1193V are front-end ICs developed for use in car radios. It incorporates an extremely wide dynamic range mixer and a new AGC system consisting of a dual-system wide-band AGC and a new keyed AGC to provide excellent interference suppression characteristics.

Features

• Improved interference characteristics

— Expanded mixer input dynamic range Mixer input usable sensitivity : 15dBµ Mixer input I.M. QS : 90dBµ (The dynamic range has been increased by 6dB over the earlier LA1175M.)

— Development of a new wide-band AGC circuit

Improved interference characteristics for both nearchannel interference and far-channel interference Improved interference characteristics for the TV band

— Development of a 3D-AGC system

The adjacent channel two-signal interference characteristics can be effectively improved without degrading the strong-field three-signal interference characteristics during keyed AGC operation.

• Improved stability design

— AGC circuit local oscillator isolation

Measures were taken to prevent the deterioration of AMR, noise level, THD and other characteristics during AGC operation.

— AGC circuit incorrect operation measures

The LA1193M provides methods to prevent incorrect operation due to local oscillator injection and loss of DC balance.

• Improved temperature characteristics

— Conversion gain

— AGC sensitivity

— Antenna damping drive output current

Functions

• Double-balance mixer

• Pin diode drive output

• Differential IF amplifier

• Dual-system wide-band AGC circuit

• Local buffer output

• 3D-AGC system

• FET gate drive AGC output

• IF amplifier gain control pin