ICs for FM/AM Tuner
n Overview
The AN7259S is an FM–IF/DET IC for car radio/car
stereo and has each function necessary for electronic-
tuner.
n Features
• Quadrature detection system and fewer external parts
• Good linearity of control voltage output used for AGC
and separation control, etc.
• IF counter output and search output in channel selec-
tion signal as electronic tuning and with IF counter out-
put ON/OFF circuit (SSC)
• Adjustment of search band width and search output
center frequency
• Soft muting adjusting function
AN7259S
FM-IF Amplifier Circuit for Car Radio
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
FM IF Amp.
VCONT. Search
Counter
SSC
FM Det.
Mute
Amp.
GND VCC
n Block Diagram
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-Lead SOP Package (SOP020-P-0300A)