TL H 7149
LM3089
FM
Receiver
IF
System
September 1992
LM3089 FM Receiver IF System
General Description
The LM3089 has been designed to provide all the major
functions required for modern FM IF designs of automotive
high-fidelity and communications receivers
Features
Y
Three stage IF amplifier limiter provides 12 mV (typ)
b
3 dB limiting sensitivity
Y
Balanced product detector and audio amplifier provide
400 mV (typ) of recovered audio with distortion as low
as 0 1% with proper external coil designs
Y
Four internal carrier level detectors provide delayed
AGC signal to tuner IF level meter drive current and in-
terchannel mute control
Y
AFC amplifier provides AFC current for tuner and or
center tuning meters
Y
Improved operating and temperature performance es-
pecially when using high Q quadrature coils in narrow
band FM communications receivers
Y
No mute circuit latchup problems
Y
A direct replacement for CA3089E
Connection Diagram
Dual-In-Line Package
TL H 7149 2
Top View
Order Number LM3089N
See NS Package Number N16E
C1995 National Semiconductor Corporation
RRD-B30M115 Printed in U S A
Block Diagram
TLH7149
1
Toko
America
1250
Feehanville
Drive
Mount
Prospect
IL
60056
(312)
297-0070
2
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
a
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 seconds)
260 C
Electrical Characteristics
(T
A
e
25 C V
CC
e a
12V see Test Circuit)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
DC CHARACTERISTICS (V
IN
e
0 NOT MUTED)
I
11
Supply Current
16
23
30
mA
V1 2 3
IF Input and Bias
1 2
1 9
2 4
V
V6
Audio Output
5 0
5 6
6 0
V
V7
AFC Output
5 0
5 6
6 0
V
V10
Reference Bias
5 0
5 6
6 0
V
V12
Mute Control
5 0
5 4
6 0
V
V13
IF Level
0
0 5
V
V15
Delayed AGC
4 2
4 7
5 3
V
DYNAMIC CHARACTERISTICS f
o
e
10 7 MHZ Df
e
g
75 kHz
400 Hz
V
IN
(LIM)
Input Limiting
b
3 dB
12
25
m
V
AMR
AM Rejection
V
IN
e
100 mV AM 30%
45
55
b
dB
V
O
(AF)
Recovered Audio
V
IN
e
10 mV
300
400
500
mVrms
THD
Total Harmonic Distortion
Single Tuned (Note 1)
V
IN
e
100 mV
0 5
1 0
%
Double Tuned (Note 1)
V
IN
e
100 mV
0 1
0 3
%
S
a
N N
Signal to Noise Ratio
V
IN
e
100 mV
60
70
dB
V12
Mute Control
V
IN
e
100 mV
0
0 5
V
V13
IF Level
V
IN
e
100 mV
4 0
5 0
6 0
V
V13
IF Level
V
IN
e
500 mV
1 0
1 5
2 0
V
V15
Delayed AGC
V
IN
e
100 mV
0 1
0 5
V
V15
Delayed AGC
V
IN
e
30 mV
2 5
V
V
O
(AF)
Audio Muted
V
IN
e
100 mV V5
e a
2 5V
60
b
dB
Note 1
Distortion is a function of quadrature coil used
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
Typical Performance Characteristics
Sensitivity vs IF Input Signal
Typical S
a
N N and IF Limiting
IF Input Signal
Meter Output (Pin 13) vs
Typical AGC (Pin 15) and
IF Input Signal
AM Rejection (30% Mod) vs
TL H 7149 3
3
Schematic Diagram
TLH7149
4
4
Typical Performance Characteristics
Supply Voltage (V11)
Supply Current (I
11
) vs
Meter Output vs Supply Voltage
Reference Voltage AGC and
vs IF Input Signal
Mute Control Output (Pin 12)
TL H 7149 5
Typical Audio Attenuation
(Pin 6) vs Mute Input
Voltage (Pin 5)
TL H 7149 6
DC Test Circuit
TL H 7149 7
AC Test Circuit
KAC-K2318HM
TL H 7149 8
For single tuned dectector coil
L
O
tunes with 100 pF at 10 7 MHz
Q
UL
(unloaded) j 75
Q
L
(loaded) j 13 for V9 j 150 mVrms
For double tuned detector coil
Q
ULPRI
e
QULSEC
j
75
kQ j 0 7 for V9 j 150 mVrms
Note
The recovered audio output voltage will be approximately 0 5 dB less when
using the double tuned detector coil
For proper operation of the mute circuit the RF voltage at pin 9 should be
150 mVrms
g
30 mV
5
PDF 
ZIP