ICs for FM/AM Tuner
AN7243S
FM Front-end Circuit for Car Radio
s
Overview
The AN7243S is an FM front-end IC designed for DTS
except RF amp. of car radio. It is built-in local oscillation
frequency buffer output and PIN diode (ADX) driver for
antenna damping.
Unit : mm
0.4±0.25 1.24
temper-
0.3
4.2±0.3
6.5±0.3
14-Lead SOP Package (SOP014-P-0225)
s
Block Diagram
GND
14
13
12
11
10
9
8
ADX
Driver
Mix.
IF-Amp.
Buffer
OSC
AGC & Det.
Buffer
1
2
3
V
CC
4
5
6
7
0.15
0.65
ature characteristics to RF amp.
1.5±0.2
s
Features
•
High sensitivity · High S/N ratio
•
Good IM characteristics at strong input
•
Timing for AGC input level is variable.
•
Built-in pre-IF-Amp. having negative (positive)
0.1±0.1
1
2
3
4
5
6
7
14
13
12
11
10
9
8
10.1±0.3
1.27