This document provides specifications for the AN7273 and AN7273S ICs, which are designed for stereo tuners. It includes: 1) An overview of the ICs' functions including level meter output, stop signal output, and low power consumption. 2) A block diagram showing the ICs' components like the FM/AM IF amplifier, FM detector, and audio amplifier. 3) Pin descriptions and specifications for electrical characteristics, maximum ratings, and recommended operating ranges. 4) Application circuit diagrams and specifications for external components like coils and filters.

1. ICs for FM/AM Tuner
s Overview
The AN7273 and the AN7273S are the ICs designed
for Hi-Fi stereo tuner. They are functioned with stop signal
pin besides the AN7223S function.
s Features
• Level meter output (FM–AM common use)
• Stop signal output (for synthesizer tuner)
• AM : including RF amplifier and high sensitivity
• Low power consumption
• Low shock noise level from function switch operation
• Fewer external parts
AN7273, AN7273S
AM Tuner, FM/AM IF Amplifier Circuit
8 9
1
7
4
3
5 18 6 2 10 11
15
13
16
17
14
12
AM–FM
IF Amp.
FM IF
Amp.
FM
Quad. Det.
Mute Det.
AF Amp.
Mute or Shock
Noise Canceller
Level Meter
AM
Mixer
AM RF
Amp.
AM
L. Osc.
AGC AM Det.
GNDVCC (AM)
VCC
VREF
s Block Diagram
1
2
3
4
5
6
7
8
3 ~ 15˚
7.62±0.25
0.3
+ 0.1
– 0.025
3.8±0.25 (3.45)
0.51min.
2.54
1.2±0.25
0.5±0.1
Unit : mm
6.3±0.25
18
17
16
15
14
13
12
11
21.7±0.3
9 10
AN7273
18-Lead DIP Package (DIP018-P-0300E)
1.30.4±0.251.27
0.1
0.3
1.2±0.3
0.65
0.15
AN7273S
12.6±0.37.7±0.3
5.4±0.3
Unit : mm
18-Lead SOP Package (SOP018-P-0300)
1
9
18
10

2. AN7273, AN7273S ICs for FM/AMTuner
Pin No. Pin Name
1
2
3
4
5
6
7
8
9
FM IF Input
AM Supply/Mute Adjustment
AM RF Input
AM Mixer Output
AGC Output (2)
AGC Output (1)
AM IF 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 Detection Coil
AF Output
VCC
Level Meter Output
AFC Output
Reference Voltage
Local Oscillation Coil
Parameter Symbol Rating Unit
PD
Topr
Tcsg
VCC
ICC
AN7273
AN7273S
AN7273
AN7273S
AN7273
AN7273S
Power Dissipation
Operating Ambient Temperature
Storage Temperature
Supply Voltage
Supply Current
mW
˚C
˚C
V
mA
14.4
30
317 *1
210 *2
–20 ~ + 75
–20 ~ + 75
–55 ~ + 150
–55 ~ + 125
*1 Ta = 25˚C, *2 Ta = 75˚C
s Absolute Maximum Ratings (Ta=25˚C)
DC measurement
Vi =80dBµ
Input at VO = –3dB
Input at VO =more than –20dB
Vi =70dBµ
Vi =100dBµ
DC measurement
Vi =80dBµ
Input at VO =10mV
Vi = –10dBµ
Vi =80dBµ
Parameter Symbol Condition min. typ. max. Unit
s Electrical Characteristics (VCC= 5V, Ta= 25˚C)
Itot
VO
Vi (lim)
Vi (Mute)
V15–11
V15–11
Itot
VO
Smax.
V15–11
V15–11
9
75
43.5
55
0.61
1.14
8
60
4
0
1.12
14
100
46
64
0.8
1.26
13
80
9.5
1.25
20
125
49.5
73
1.1
1.42
19
100
15
130
1.38
mA
mV
dBµ
dBµ
V
V
mA
mA
dBµ
mV
V
Total Circuit Current
Demodulation Output Level
Limiting Sensitivity
Muting Sensitivity
Level Meter Driving Output (1)
Level Meter Driving Output (2)
Total Circuit Current
Detection Output Level
Max. Sensitivity
Level Meter Driving Output (1)
Level Meter Driving Output (2)
Note) Unless otherwise specified, fi =10.7MHz, Mod. = 22.5kHz, fm = 400Hz (FM)
fi =1MHz, Mod. = 30%, fm = 400Hz (AM)
FM
AM
Parameter Symbol Range
s Recommended Operating Range (Ta = 25˚C)
Operating Supply Voltage Range VCC (opr) 3 ~ 12V

3. ICs for FM/AMTuner AN7273, AN7273S
Vi (lim), VO, Itot –VCC (FM)
VO –Vi
0
–20
–40
–60
–80
Input Voltage Vi (dBµ)
OutputVoltageVO(dB)
600 20 40 12010080
Mute ON
VO –Df
10
0
–10
–20
–30
–40
–50
–60
–70
Input Frequency Change Df (kHz)
OutputVoltageVO(dB)
0–300 –200 –100 300200100
140
120
100
80
60
50
48
46
44
14
12
10
8
6
4
2
0
InputLimitingVoltageVi(lim)(dBµ)
TotalCircuitCurrentItot(mA)
0 2 4 6 8 10 12 14 16
OutputVoltageVO(mV)
OutputVoltageVO(mV)
Supply VoltageVCC (V)
VCC = 5V
fi = 10.7MHz
fm = 400Hz, 22.5kHz
140
120
100
80
60
40
28
24
20
16
12
14
13
12
11
10
InputVoltageVi(dBµ)
TotalCircuitCurrentItot(mA)
0 2 4 6 8 10 12 14 16
Supply Voltage VCC (V)
fm = 400Hz, 30%
fi = 1MHz
VO, Vi, Itot –VCC (AM)
VO
Itot (Mute ON)
Itot (Mute OFF)
Vi (lim)
VO (Vi = 80dBµ)
Itot
Vi (at VO = 10mV )
Mute OFF
Mute ON
Mute OFF
VCC = 5V
fi = 10.7MHz
fm = 22.5kHz,
400Hz
0dB = 108mV
VO, Vno, THD –Vi (FM)
0
–10
–20
–30
–40
–50
–60
–70
–80
Input Voltage Vi (dBµ)
OutputVoltageVO(dB),OutputNoiseVoltageVno(dB)
600 20 40 12010080
5
4
3
2
1
0
TotalHarmonicDistortionTHD(%)
0dB = 81mV
VCC = 5V
fm = 400Hz
fi = 1MHz
VO, S/N, THD –Vi (AM)
10
0
–10
–20
–30
–40
–50
–60
–70
Input Voltage Vi (dBµ)
OutputVoltageVO(dB),SignaltoNoiseRatioS/N(dB)
600 20 40 12010080
12
10
8
6
4
2
0
TotalHarmonicDistortionTHD(%)
V15 –Vi
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Input Voltage Vi (dBµ)
LevelmeterVoltageV15(V)
600 20 40 12010080
VCC = 5V
(AM) fi = 1MHz
fm = 400Hz, 30%
(FM) fi = 10.7MHz
fm = 400Hz, 22.5kHz
THD
Mod. = 80%
VO
S/N
Mod. = 30%
THD
Vno
VO
AM
FM

4. AN7273, AN7273S ICs for FM/AMTuner
1 2 3 4 5 6 7 8 9
17 16 15 14 13 12 11 10
AN7273/S
–
+
–
+
–
+–
+
–
+
–
+
–
+
CF1T3
2kΩ
10kΩ
ON
OFF
Mute
330Ω
From
FM Front
End.
0.022µF 0.022µF
4.7µF
100µF
0.022µF
0.0047µF
0.01
µF
27kΩ
470Ω
2.2kΩ
D1
51Ω
100µF
100µF
47µF
47ΩFM
AM0.022
µF
V152.2µF
10µF
5.1kΩ
0.022µF
T2
D1 : MA27W
VCC=5V
VO (FM, AM)
0.022µF
T1
18
s Application Circuit
22µF
0.022µF
47µF
0.0047µF
0.022µF
100µF
2.2kΩ
0.01µF
27kΩ AF Output
VCC
T1
10µF
5.1kΩ
1
470Ω
VCC
1µF47Ω
SW
FM
AM
2.2kΩ
MuteAdj.
10kΩ
100µF
0.022µF
Mute SW MA27W (Matsushita)
AM
IN
T2
AM ANT
C1
ANT OSC
CF2
0.022µF
0.022µF
0.022µF
47pF
4.7µF
100µFCF1
T3
330Ω
18
FM IF Input
+ –
AN7273
s Printed Circuit Board Layout

5. ICs for FM/AMTuner AN7273, AN7273S
Symbol
T1
Use, Freq. Type No. Maker Connection Diagram Number of Turns Tuning Cap. Unloaded Q
T2
T3
Matsushita
Matsushita
Matsushita
100pF
—
1500pF
90±20%
95±20%
60±30%
FM
Quad. Coil
10.7MHz
AM MW
Osc. Coil
AM Mix.
Output
455kHz
ELL–
7S754
ELF–
7S752A
s Coil Specifications
1 – 2 8T
2 – 3 5T
4 – 6 3T
1 – 2 4T
2 – 3 125T
4 – 6 7T
3 – 2 35T
6 – 4 10T
2 – 1 19T
EIA–
7S802A
4
6
2
1
3
4
6
2
3
1
4
6
2
3
1
TokoCF1
Symbol Maker Band Width Loss
s Ceramic Filter Specification
455kHz
Use Type No. Center Freq.
AM IF CFM2– 455B 7kHz (–6dB) 2.6dB