ICs for FM/AM Tuner
n 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).
n 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
AN7280S
FM Front-end IC for Car Radio
Unit : mm
0.1
–
0.1
1.5
–
0.2
0.3
0.650.15
0.4 1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
0.4
–
0.25
1.27
12.6
–
0.3
5.4– 0.3
7.7– 0.3
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
ADX
Mixer
Buffer
Buffer
OSC Det.
AGC Amp.
IF Amp.
VREG
SSC
GND
GND
VCC
n Block Diagram
20-Lead SOP Package (SOP020-P-0300B)