ICs for FM/AMTuner
AN7273, AN7273S
■ Application Circuit
FM
47Ω
VCC=5V
0.022
+
–
AM
V15
µF
+
–
0.022µF
470Ω
VO (FM, AM)
27kΩ
2.2µF
47µF
0.0047µF
T1
0.022µF
+
–
+
–
+
–
0.022µF
D1 : MA27W
51Ω
T2
D1
18 17 16 15 14 13 12 11 10
AN7273/S
1
2
3
4
5
6
7
8
9
+
–
+
–
0.022µF
0.022µF
2kΩ
10kΩ
T3
CF1
From
FM Front
End.
Mute
ON
330Ω
OFF
■ Printed Circuit Board Layout
FM IF Input
C1
AN7273
AM ANT
100µF
4.7µF
CF1
T3
ANT
OSC
47pF
CF2
0.022µF
0.022µF
1
SW
FM
AM
IN
0.022µF
18
2.2kΩ
AM
T2
10µF
T1
VCC
+
1µF
47Ω
–
10kΩ
470Ω
27kΩ
0.01µF
AF Output
100µF
MA27W (Matsushita)
Mute SW
VCC