TLH5586

August 1989

LM3361A Low VoltagePower Narrow Band FM IF System

General Description

The LM3361A contains a complete narrow band FM de-

modulation system operable to less than 2V supply voltage

Blocks within the device include an oscillator mixer FM IF

limiting amplifier FM demodulator op amp scan control

and mute switch The LM3361A is similar to the MC3361

with the following improvements the LM3361A has higher

voltage swing both at the op amp and audio outputs It also

has lower nominal drain current and a squelch circuit that

draws significantly less current than the MC3361 Device

pinout functions are identical with some slightly different op-

erating characteristics

Features

Y

Functions at low supply voltage (less than 2V)

Y

Y

High audio output (increased 6 dB over MC3361)

Y

Y

Minimal drain current increase when squelched

Y

Low external parts count

Block Diagram and Test Circuit

TLH5586 – 1

T1-TOKO RMC-2A6597HM

CF-MURATA CFU 455E

Order Number LM3661AM

or LM3361AN

See NS Package Number

M16A or N16E

C1995 National Semiconductor Corporation

RRD-B30M115Printed in U S A