ICs for FM/AM Tuner
n 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.
n 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
n 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)
1.3
0.4
–
0.25
1.27
0.1
0.3
1.2
–
0.3
0.650.15
AN7273S
12.6
–
0.3
7.7– 0.3
5.4– 0.3
Unit : mm
18-Lead SOP Package (SOP018-P-0300)
1
9
18
10