TL H 7960
LM3189
FM
IF
System
April 1987
LM3189 FM IF System
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 desir-
able 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 log-
ic In addition internal power supply regulators maintain a
nearly constant current drain over the voltage supply range
of
a
8 5V to
a
16V
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 pack-
age and can operate over the ambient temperature range of
b
40 C to
a
85 C
Features
Y
Exceptional limiting sensitivity 12 mV typ at
b
3 dB
point
Y
Low distortion 0 1% typ (with double-tuned coil)
Y
Single-coil tuning capability
Y
Improved (S
a
N) N ratio
Y
Externally programmable recovered audio level
Y
Provides specific signal for control of inter-channel mut-
ing (squelch)
Y
Provides specific signal for direct drive of a tuning me-
ter
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
Block Diagram
TL H 7960 1
All resistance values are in X
L tunes with 100 pF (C) at 10 7 MHz Q
0
j
75
(Toko No KACS K586HM or equivalent)
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
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
Power Dissipation (Note 2)
1500 mW
Operating Temperature Range
b
40 C to
a
85 C
Storage Temperature Range
b
65 C to
a
150 C
Lead Temperature (Soldering 10 sec )
260 C
Electrical Characteristics
T
A
e
25 C V
a
e
12V
Symbol
Parameter
Conditions
Min
Typ
Max
Units
(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
V
I
(lim)
Input Limiting Voltage (
b
3 dB Point)
12
25
m
V
AMR
AM Rejection (Term 6)
V
IN
e
0 1V
45
55
dB
V
O
(AF)
Recovered AF Voltage (Term 6)
AM Mod
e
30%
f
o
e
10 7 MHz
325
500
650
mV
THD
Total Harmonic Distortion (Note 1)
f
mod
e
400 Hz
Single Tuned (Term 6)
Deviation
g
75 kHz
0 5
1
%
Double Tuned (Term 6)
V
IN
e
0 1V
0 1
%
S
a
N N
Signal Plus Noise to Noise Ratio
65
80
dB
(Term 6)
f
DEV
Deviation Mute Frequency
f
mod
e
0
g
40
kHz
V16
RF AGC Threshold
1 25
V
V12
On Channel Step
V
IN
e
0 1V
f
DEV
k g
40 kHz
0
V
f
DEV
l g
40 kHz
5 6
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 the device must be derated based on a 150 C maximum junction temperature and a thermal resistance
of 80 C W junction to ambient
Connection Diagram
Dual-In-Line Package
TL H 7960 2
Top View
Order Number LM3189N
See NS Package Number N16E
2
Test Circuits
Test Circuit for LM3189N Using a Single-Tuned Detector Coil
All resistance values are in X
L tunes with 100 pF (C) at 10 7 MHz
Q
o
(unloaded) j 75 (Toko No KACS K586HM
or equivalent)
C
e
0 01 mF for 50 ms de-emphasis (Europe)
e
0 015 mF for 75 ms de-emphasis (USA)
TL H 7960 3
Test Circuit for LM3189N Using a Double-Tuned Detector Coil
All resistance values are in X
T PRI
Q
o
(unloaded
j
75 (tunes with 100 pF
(C12)) 20t of 34e on 7 32 dia form
SEC
Q
o
(unloaded) j 75 (tunes with 100 pF
(C2)) 20t of 34e on 7 32 dia form
kQ(percent of critical coupling) j 70%
(adjusted for coil voltage (V
C
)
e
150 mV
Above values permit proper operation of mute
(squelch) circuit ``E'' type slugs spacing 4 mm
C
e
0 01 mF for 50 ms de-emphasis (Europe)
e
0 015 mF for 75 ms de-emphasis (USA)
TL H 7960 4
3
Complete FM IF System for High Quality Tuners
The circuit provides a complete FM IF system for a high
quality receiver Either one or two stages of amplification
and bandpass filtering may be desired depening on the
receiver requirements See graph for Typical Limiting and
Noise Characteristics for each circuit configuration which
can be compared to the LM3189N alone
Complete FM IF System for High Quality Receivers
All resistance values are in X
CF Ceramic filters Toko CSFE or equivalent
L tunes with 100 pF (C) at 10 7 MHz
Q
o
(unloaded) j 75 (Toko No KACS K586 HM
or equivalent)
TL H 7960 5
Printed Circuit Board and Component Layout
TL H 7960 6
Component Side
4
Typical Performance Characteristics
IF Input Signal
AM Rejection (30% Mod) vs
(Pin 12) vs IF Input Signal
Mute Control Output
Voltage (Pin 5)
(Pin 6) vs Mute Input
Typical Audio Attenuation
of Input Signal Voltage
Meter Output as a Function
Muting Action Tuner AGC and Tuning
of Change in Frequency)
at Term 7 as a Function
AFC Characteristics (Current
a Function of Load Resistance
Deviation Mute Threshold as
(Between Term 7 and Term 10)
Typical Limiting and Noise
Characteristics
TL H 7960 7
5
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