ICs for FM/AM Tuner
AN7280S
FM Front-end IC for Car Radio
s
Overview
The AN7280S is an FM front-end IC designed for DTS
except RF amp. of car radio. It features built-in local oscil-
lation frequency buffer output, PIN diode driver for anten-
na damping and SSC (search stop control).
Unit : mm
0.4
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1.5±0.2
0.4±0.25
s
Features
•
High sensitivity, high S/N ratio
•
Good IM characteristics at strong input
•
Available for two loop AGC (keyed AGC)
•
Pre IF amp. gain variable
•
PIN diode driver (ADX) built-in
0.1±0.1
1.27
0.3
5.4±0.3
7.7±0.3
20-Lead SOP Package (SOP020-P-0300B)
s
Block Diagram
GND
20
19
18
17
16
15
14
13
12
11
ADX
IF Amp.
Mixer
V
REG
Buffer
AGC Amp.
Buffer
SSC
Det.
OSC
1
2
3
4
5
6
7
8
GND
9
10
V
CC
0.15
0.65
12.6±0.3
PANASONIC [ PANASONIC SEMICONDUCTOR ]
