Overview

The LA1845N/1845NM is designed for use in mini systems and is a single-chip tuner IC that provides electronic tuning functions using SD/IF-count technigue. It incorporates a pilot canceler and an adjustment-free MUX VCO circuit, thus allows additional parts to be reduced.

Functions

• AM: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, SD, oscillator buffer, IF buffer,

stereo IF output, AGC time constant switch

• FM IF: IF amplifier, quadrature detector, S-meter, SD (signal detection), S-curve detection, IF buffer output

• MPX: PLL stereo decoder, stereo display, forced monaural, VCO stop, audio muting, adjacent

channel interference rejection function, pilot canceler

Features

• Integrated MPX VCO (ceramic resonators are no longer required.)

• Built-in adjacent channel interference rejection function(114 kHz, 190 kHz)

• Supports both SD and IF-count techniques

• Both FM SD sensitivity and bandwidth can be set

• Pilot canceler built in.