n Overview
The AN7233SH is an IC for tuner of 1.5V headphone
stereo. It incorporates AM tuner + FM IF + FM detector +
FM MPX and has been provided with the station detec-
tion function and IF count output function required to sup-
port DTS, and the AM IF output function required to sup-
port AM stereo. It is included in the 28-lead SSOP pack-
age with 0.5mm pitch.
n Features
• Low voltage operation : V
CC
=1.0V or more
• AM tuner/FM IF + FM detection + FM MPX : one chip
• DTS supported
• AM stereo support possible
• Adjustable sensitivity for station detection
• Small package
n Block Diagram
ICs for FM/AM Tuner
AN7233SH
FM/AM Tuner for 1.5V Headphone Stereo
Unit : mm
28 15
114
(0.65) 0.50
0.2
+ 0.10
– 0.05
1.55max.1.20
–
0.20
28-lead SSOP package (SSOP028-P-0300)
7.80– 0.20
8.10
–
0.30
6.10
–
0.20
0.5– 0.20
SEATING PLANE
0 ~10˚
0.15
+ 0.10 – 0.05
SEATING PLANE 0.10
–
0.10
AM Det.
AGC
PC
AM
Osc
AM
Mix.
AM
RF
IF
LEVEL
Det.
SD
VCC GND
FM
Det.
ST Ind. VCO LPF
MPX
SW
AM AF
Buffer
1 2 3 4 5 6 7 8 9 10 11 12 13 14
28 27 26 25 24 23 22 21 20 19 18 17 16 15
Freq.
Divider