92706 / O3105 MS OT B8-3807 No.8271-1/9

LA1837M

Overview

The LA1837M is a single-chip AM/FM tuner IC that provides AM and FM IF and multiplex decoding circuits for

electronic tuning and was developed for use in home stereo systems. It provides both SD and IF counting techniques for

optimal implementation of automatic station selection.

Features

• On-chip MPX VCO circuit (no external components required).

• Adjacent channel interference rejection function (third order and fifth order).

• Supports both the SD and IF counting technique (built-in SD speedup function).

• The AM and FM SD sensitivity can be set independently.

• The AM and FM output levels can be set independently.

• Improved basic FM reception performance.

Functions

• AM: RF amplifier, mixer, oscillator, IF amplifier, detector, AGC, oscillator buffer, S-meter, narrow band SD, IF buffer

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

• Multiplex stereo decoding: PLL stereo decoder, stereo indicator, forced monaural, VCO stop function, post amplifier,

audio muting, adjacent channel interference rejection function

Specifications

Maximum Ratings at Ta = 25

°C

Parameter

Symbol

Conditions

Ratings

Unit

Maximum supply voltage

VCC max

12

V

Allowable power dissipation

Pd max

Ta

≤70°C*

550

mW

Operating temperature

Topr

-20 to +70

°C

Storage temperature

Tstg

-40 to +125

°C

*: Mounting board: 114.3

×76.1×1.6mm glass epoxy board

Ordering number : EN8271

Monolithic Linear IC

Single-Chip AM/FM Tuner IC for

Home Stereo Systems

Any and all SANYO Semiconductor products described or contained herein do not have specifications

that can handle applications that require extremely high levels of reliability, such as life-support systems,

aircraft's control systems, or other applications whose failure can be reasonably expected to result in

serious physical and/or material damage. Consult with your SANYO Semiconductor representative

nearest you before using any SANYO Semiconductor products described or contained herein in such

applications.

SANYO Semiconductor assumes no responsibility for equipment failures that result from using products

at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition

ranges, or other parameters) listed in products specifications of any and all SANYO Semiconductor

products described or contained herein.