Page 1
■ 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 detection function and IF count output function required to support DTS, and the AM IF output function required to support AM stereo. It is included in the 28-lead SSOP package with 0.5mm pitch.
■ Features
•
Low voltage operation : VCC=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
■ 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
28 27 26 25 24 23 22 21 20 19 18 17 16 15
AM
Osc
AM
Mix.
AM
RF
1 2 3 4 5 6 7 8 9 10 11 12 13 14
ST Ind. VCO LPF
Freq.
Divider
IF
MPX
SW
PC
AM Det.
AGC
LEVEL
Det.
SD
FM
Det.
V
CC
GND
AM AF
Buffer
Page 2
AN7233SH
ICs for FM/AM Tuner
■ Absolute Maximum Ratings (Ta=25˚C)
VCC
I
CC
P
D
T
opr
T
stg
Supply Voltage
Supply Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
V
mA
mW
˚C
˚C
Parameter Symbol Rating Unit
7.0
10
70
–20 ~ + 75
–55 ~ + 125
Parameter Symbol Range
■ Recommended Operating Range (Ta=25˚C)
Operating Supply Voltage Range
V
CC
1.0V ~ 2.0V
Parameter Symbol Condition min. typ. max. Unit
■ Electrical Characteristics (V
CC
=1.2V, Ta= 25˚C±2˚C)
Total Circuit Current
Output Voltage
Limiting Sensitivity
S/N Ratio
THD
mA
mV
dBµ
dB
%
No signals (under VCO operating)
V
i
for VO = –3dB
I
tot (FM)
V
O (FM)
V
i (lim)
IF Buffer Output 2
LED ON Sensitivity
LED Decreased Voltage ON Sensitivity
IF Buffer Output 1
VCC=
1.0V, No modulation REQ OFF
VIN= 80dBµ, No modulation
VCC=
1.1V, No modulation REQ OFF
V
i (FMLED1)
V
i (FMLED2)
V
OIF1 (FM)
5.5
26
38
55
7.5
44
45
9.5
61
48
1.4
48
48
55
58
48
61
69
86
dBµ
dBµ
mVrms
Note) FM : f = 10.7MHz, Df = 22.5kHz, f
m
= 1kHz, VIN = 80dBµ, AM : f = 1MHz, Mod. = 30%, fm = 1kHz, VIN = 50dBµ
MPX : f = 10.7MHz, Df = 75kHz (L+ R90%, Pilot90%), fm = 1kHz, VIN = 80dBµ
FM
S/N (FM)
THD (FM)
AM
S/N (AM)
THD (AM)
VCC=
1.1 V, No modulation REQ OFF
MPX
THD
(STEREO)
V
P (ON)
V
P (OFF)
V
OIF2 (FM)
VCC=1.0V, VIN= 80dBµ,
No modulation
mVrms
19
Total Circuit Current
Output Voltage
Weak Input Detection Output Voltage
S/N Ratio
THD
LED ON Sensitivity
Itot
(AM)
V
O (AM)
V
O (AMMIN)
mA
mV
mV
dBµ
%
dB
3.0
21
12
36
16
5.0
31
24
23
7.0
41
5.0
30
V
IN
= 26dBµ
V
i (AMLED)
IF Buffer Output 1
V
OIF1 (AM)
VCC=1.1V, VIN= 45dBµ,
No modulation
mVrms
29
43
57
IF Buffer Output 2
V
OIF2 (AM)
VCC=1.0V, VIN= 45dBµ,
No modulation
mVrms
15
AM IF Output Voltage
V
O (AM IF)
mVrms
15
30
60
V
IN
= 50dBµ, No modulation
Channel Balance
Separation
THD (Stereo)
Stereo LED ON Level
Stereo LED OFF Level
CB
Sep.
dB
dB
%
%
%
–2
22
0.8
0
35
4.8
1.9
2
5.0
7.0
Monaural Df= 75kHz
MPX Portion only L + R= 30%
L + R= 90%, Pilot= 10%
Pilot only
Pilot only
Page 3
ICs for FM/AM Tuner
AN7233SH
■ Pin Descriptions
Pin No.
Pin Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
AM RF Amp. Input
AM Mixer Output
Supply Pin for IF Input Portion/AMOSC Section
AM AGC
AM IF Amp. Input
FM IF Amp. Input
SD LED ON Level Adjustment
Stereo LED Drive/AMIF Output Pin
SD LED Drive Pin
Supply Pin
Phase-Shifter Pin for FM Detection
GND Pin
Output for FM/AM IF Count
IF Count Control Pin
Pin No.
Pin Name
15
16
17
18
19
20
21
22
23
24
25
26
27
28
AM Detection Pin
AM AF Amp. Input Pin
Oscillation Prevention Capacitor Pin
FM/AM Detection Output Pin
MPX Input Pin
Rch Output Pin
Lch Output Pin
AM/FM Changeover/19kHz Output Pin
Loop Filter Pin 1 for PLL
Loop Filter Pin 2 for PLL
CR Connecting Pin for VCO
Low Pass Filter Pin 1 for Pilot Detection
Low Pass Filter Pin 2 for Forced
MONO/Pilot Detection
AM Local Oscillation Coil Pin
Divider
AM Det.
AGC
PC
AM
OSC
AM
Mix.
AM
RF
IF
LEVEL
Det.
SD
FM
Det.
ST
Ind.
VCO
LPF
MPX
SW
AM AF
Buffer
1 2
3
6 7 8 9 10 11 12 13 14
4
5
MPX Fillter
0.022µF
24kΩ
Freg.
Counter
8200pF
+
4.7µF
4.7µF
8200pF
100kΩ
100kΩ
V
V
CC
0.047µF
STEREO
SG
0.022µF
82pF
0.33µF
6.2kΩ
6.2kΩ
+
0.22µF
AM
MONO.
+
0.1µF
1kΩ
680pF
15kΩ
10kΩ
+
1µF
10pF
V1
470kΩ
KV1281
REQ
0.01µF
0.033µF
2SC1359
100
Ω
2SC1359
3V
RF
Voltage
Meter
4.3kΩ1.8kΩ
2SK192A
390Ω
510kΩ
510kΩ
CDA10.7MG
39pF
SD
0.01µF
ST
0.022µF
+
0.01µF
51.7kΩ
IF Count
220kΩ
280Ω
50Ω
+
4.7µF
SFE10.7MA5
SFU450314
1mH
FMSG
AMSG
50Ω
50Ω
0.022µF
AMIF
Audio
Analazer
RLO2U8 – M
Tuning Electric Current
28 27 26 25 24 23 22 21 20 19 18 17 16 15
+
4.7kΩ
1kΩ
1kΩ
V
3.3
k
Ω
270
pF
■ Application Circuit
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