ICs for FM/AM Tuner
s
Overview
The AN7223 is an IC designed for high-class radio cas-
sette recorder with multifunctioned FM/AM IF system.
s
Features
Wide operating supply voltage range : V
CC
= 2.8V~12V
Incorporating both FM and AM detectors
Incorporating a level indicator output
(FM/AM common use)
AM : High sensitivity,including RF amplifier
Low power consumption
Muting control
AFC control
Fewer external parts
High stability on both AM and FM
Low shock noise level from function switch operation
SW band available (f= 30MHz)
AN7223
AM Tuner, FM/AM IF Amplifier Circuit for Radio Cassette Recorder
1
2
3
4
5
6
7
8
9
21.7
0.3
1.2
0.25
3 ~ 15
Unit : mm
6.3
0.25
0.5
0.1
2.54
18-Lead DIP Package (DIP018-P-0300E)
(3.45)
7.62
0.25
0.3
+ 0.1
0.25
18
17
16
15
14
13
12
11
10
0.51min.
3.8
0.25
8
9
12
5
18
6
2
10
11
15
13
16
17
14
1
7
4
3
AM/FM
IF Amp.
FM IF
Amp.
FM
Quad. Det.
Mute Det.
Level Meter
Mute or
Shock Noise
Canceller
AF
Amp.
AM RF
Amp.
AM
Mixer
AM
L Osc.
AGC
AM
Det.
GND
V
CC
(AM)
V
CC
s
Block Diagram
ICs for FM/AM Tuner
AN7223
Pin No.
Pin Name
1
2
3
4
5
6
7
8
9
FM IF Amp. Input
V
CC
(AM)
AM RF Amp. Input
AM Mixer Output
AGC Output (2)
AGC Output (1)
AM IF Amp. Input
IF By-pass
IF By-pass
s
Pin Descriptions
Pin No.
Pin Name
10
11
12
13
14
15
16
17
18
AM Detection Output
GND
FM Detector Coil
AF Output
V
CC
Level Meter Output
AFC Output
Reference Voltage
Local Oscillation
V
CC
P
D
T
opr
T
stg
Supply Voltage
Power Dissipation
Operating Ambient Temperature
Storage Temperature
V
mW
C
C
Parameter
Symbol
Rating
Unit
14.4
317
20 ~ + 75
55 ~ + 150
s
Absolute Maximum Ratings
(Ta=25C)
V
i
= 80dB
, f=10.7MHz,
f
dev.
= 22.5kHz, f
m
= 400Hz
Input at
O
= 3dB
Input at
O
= less than 20dB
V
i
= 50dB
, f=10.7MHz,
f
dev.
= 22.5kHz, f
m
= 400Hz
V
i
= 80dB
, f= 10.7MHz,
f
dev.
= 22.5kHz, f
m
= 400Hz
V
i
= 80dB
, f= 1MHz,
Mod.= 30%, f
m
= 400Hz
Input at
O
= 10mV
V
i
= 10dB
, f= 1MHz,
Mod.= 30%, f
m
= 400Hz
V
i
= 80dB
, f= 1MHz,
Mod.= 30%, f
m
= 400Hz
Parameter
Symbol
Condition
min.
typ.
max.
Unit
Total Circuit Current
Demodulation Output Level
Limiting Sensitivity
Muting Sensitivity
Signal Meter Driving
Output 1
Signal Meter Driving
Output 2
Total Circuit Current
Detection Output Level
Max.Sensitivity
Signal Meter Driving
Output 1
Signal Meter Driving
Output 2
I
tot
O (FM)
V
i (lim)
V
i
(mute)
V
15
V
15
I
tot
O (AM)
S
max.
V
15
V
15
9
75
41.5
45
120
1.14
8
60
4.5
0
1.12
FM
AM
mA
mV
dB
dB
mV
V
mA
mV
dB
mV
V
(DC measurement)
(DC measurement)
14
100
44.5
50
600
1.26
13
80
9.5
1.25
20
125
47.5
59
1150
1.42
19
100
12.5
130
1.38
s
Electrical Characteristics
(V
CC
=5V, Ta= 25C)
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