NSC LM3189N Datasheet

LM3189 FM IF System

LM3189 FM IF System

April 1987

General Description

The LM3189N is a monolithic integrated circuit that provides
all the functions of a comprehensive FM IF system. The
block diagram of the LM3189N includes a three stage FM IF
amplifier/limiter configuration with level detectors for each
stage, a doubly balanced quadrature FM detector and an
audio amplifier that features the optional use of a muting
(squelch) circuit.

The advanced circuit design of the IF system includes desir­able deluxe features such as programmable delayed AGC
for the RF tuner, an AFC drive circuit, and an output signal
to drive a tuning meter and/or provide stereo switching log­ic. In addition, internal power supply regulators maintain a
nearly constant current drain over the voltage supply range

a

of

8.5V toa16V.

The LM3189N is ideal for high fidelity operation. Distortion
in an LM3189N FM IF system is primarily a function of the
phase linearity characteristic of the outboard detector coil.

The LM3189N has all the features of the LM3089N plus
additions.

The LM3189N utilizes the 16-lead dual-in-line plastic pack­age and can operate over the ambient temperature range of

b

40§Ctoa85§C.

Block Diagram

Features

Y

Exceptional limiting sensitivity: 12 mV typ atb3dB
point

Y

Low distortion: 0.1% typ (with double-tuned coil)

Y

Single-coil tuning capability

Y

Improved (SaN)/N ratio

Y

Externally programmable recovered audio level

Y

Provides specific signal for control of inter-channel mut­ing (squelch)

Y

Provides specific signal for direct drive of a tuning me­ter

Y

On channel step for search control

Y

Provides programmable AGC voltage for RF amplifier

Y

Provides a specific circuit for flexible audio output

Y

Internal supply voltage regulators

Y

Externally programmable ON channel step width, and
deviation at which muting occurs

All resistance values are in X

*L tunes with 100 pF (C) at 10.7 MHz, Q

(Toko No. KACS K586HM or equivalent)

C

1995 National Semiconductor Corporation RRD-B30M115/Printed in U. S. A.

j

0

TL/H/7960

75

TL/H/7960– 1

Absolute Maximum Ratings

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.

Supply Voltage Between Pin 11 and Pins 4, 14 16V

DC Current Out of Pin 12 5 mA

DC Current Out of Pin 13 5 mA

DC Current Out of Pin 15 2 mA

Electrical Characteristics T

Symbol Parameter

e

A

a

25§C, V

(See Single-Tuned Test Circuit)

STATIC (DC) CHARACTERISTICS

I

11

Quiescent Circuit Current 20 31 44 mA

DC Voltages:
V1 Terminal 1 (IF Input) 1.2 2.0 2.4 V
V2 Terminal 2 (AC Return to Input) No Signal Input, Non Muted 1.2 2.0 2.4 V
V3 Terminal 3 (DC Bias to Input) 1.2 2.0 2.4 V
V15 Terminal 15 (RF AGC) 7.5 9.5 11 V
V10 Terminal 10 (DC Reference) 5 5.75 6 V

DYNAMIC CHARACTERISTICS

VI(lim) Input Limiting Voltage (b3 dB Point) 12 25 mV

AMR AM Rejection (Term. 6) V

e

IN

VO(AF) Recovered AF Voltage (Term. 6) AM Mod.e30%

THD Total Harmonic Distortion (Note 1) f

Single Tuned (Term. 6) Deviation
Double Tuned (Term. 6)

SaN/N Signal Plus Noise to Noise Ratio

e

V

IN

(Term. 6)

f

DEV

Deviation Mute Frequency f

V16 RF AGC Threshold 1.25 V

V12 On Channel Step V

Note 1: THD characteristics are essentially a function of the phase characteristics of the network connected between terminals 8, 9, and 10.

Note 2: For operation in ambient temperatures above 25

C/W junction to ambient.

of 80

§

C, the device must be derated based on a 150§C maximum junction temperature and a thermal resistance

§

e

IN

Power Dissipation (Note 2) 1500 mW

Operating Temperature Range

Storage Temperature Range

b

40§Ctoa85§C

b

65§Ctoa150§C

Lead Temperature (Soldering, 10 sec.) 260§C

e

12V

Conditions

Min Typ Max Units

0.1V 45 55 dB

325 500 650 mV

0.1 %

0.1V

f

o
mod

e

10.7 MHz,

e

400 Hz,

g

75 kHz 0.5 1 %

65 80 dB

0.1V f
f

e

0

mod

k

g

40 kHz 0

DEV

l

g

40 kHz 5.6

DEV

g

40 kHz

V

Connection Diagram

Dual-In-Line Package

TL/H/7960– 2

Top View

Order Number LM3189N

See NS Package Number N16E

2

Test Circuits

All resistance values are in X

*L tunes with 100 pF (C) at 10.7 MHz,

Q

(unloaded)j75 (Toko No. KACS K586HM

o

or equivalent)

e

**C

0.01 mF for 50 ms de-emphasis (Europe)

e

0.015 mF for 75 ms de-emphasis (USA)

All resistance values are in X

*T:PRIÐQ

(unloadedÐj75 (tunes with 100 pF

o

(C12)) 20t of 34e on 7/32

(unloaded)j75 (tunes with 100 pF

SECÐQ

o

(C2)) 20t of 34e on 7/32
kQ(percent of critical coupling)j70%
(adjusted for coil voltage (V

Above values permit proper operation of mute
(squelch) circuit ‘‘E’’ type slugs, spacing 4 mm

e

**C

0.01 mF for 50 ms de-emphasis (Europe)

e

0.015 mF for 75 ms de-emphasis (USA)

×

dia form

×

dia form

C

)e150 mV

Test Circuit for LM3189N Using a Single-Tuned Detector Coil

TL/H/7960– 3

Test Circuit for LM3189N Using a Double-Tuned Detector Coil

TL/H/7960– 4

3