ICs for FM/AM Tuner
AN7233SH
FM/AM Tuner for 1.5V Headphone Stereo
s
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.
7.80±0.20
28
15
+ 0.10
Unit : mm
6.10±0.20
8.10±0.30
0.15
– 0.05
0 ~10˚
0.5±0.20
s
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
1
14
0.2
– 0.05
(0.65)
0.50
0.10±0.10
16
+ 0.10
1.20±0.20
1.55max.
SEATING PLANE
15
AM AF
Buffer
13
14
SEATING PLANE
28-lead SSOP package (SSOP028-P-0300)
s
Block Diagram
28
27
26
25
24
23
22
21
20
19
18
17
AM
Osc
ST Ind.
VCO
LPF
MPX
SW
AM
Mix.
Freq.
Divider
PC
AM Det.
AGC
AM
RF
IF
LEVEL
Det.
SD
FM
Det.
1
2
3
4
5
6
7
8
9
10
V
CC
11
12
GND
AN7233SH
s
Absolute Maximum Ratings
(Ta=25˚C)
Parameter
Supply Voltage
Supply Current
Power Dissipation
Operating Ambient Temperature
Storage Temperature
Symbol
V
CC
I
CC
P
D
T
opr
T
stg
Rating
7.0
10
70
–20 ~ + 75
–55 ~ + 125
ICs for FM/AM Tuner
Unit
V
mA
mW
˚C
˚C
s
Recommended Operating Range
(Ta=25˚C)
Parameter
Operating Supply Voltage Range
Symbol
V
CC
Range
1.0V ~ 2.0V
s
Electrical Characteristics
(V
CC
=1.2V, Ta= 25˚C±2˚C)
Parameter
FM
Total Circuit Current
Output Voltage
Limiting Sensitivity
S/N Ratio
THD
LED ON Sensitivity
LED Decreased Voltage ON Sensitivity
IF Buffer Output 1
IF Buffer Output 2
AM
Total Circuit Current
Output Voltage
Weak Input Detection Output Voltage
S/N Ratio
THD
LED ON Sensitivity
IF Buffer Output 1
IF Buffer Output 2
AM IF Output Voltage
MPX
Channel Balance
Separation
THD (Stereo)
Stereo LED ON Level
Stereo LED OFF Level
Note)
CB
Sep.
THD
(STEREO)
V
P (ON)
V
P (OFF)
Monaural Df= 75kHz
MPX Portion only L + R= 30%
L + R= 90%, Pilot= 10%
Pilot only
Pilot only
0.8
4.8
1.9
–2
22
0
35
5.0
7.0
2
dB
dB
%
%
%
Itot
(AM)
V
O (AM)
V
O (AMMIN)
S/N (AM)
THD (AM)
V
i (AMLED)
V
OIF1 (AM)
V
OIF2 (AM)
V
O (AM IF)
V
CC
=1.1 V, No modulation REQ OFF
V
CC
=1.1V, V
IN
= 45dBµ,
No modulation
V
CC
=1.0V, V
IN
= 45dBµ,
No modulation
V
IN
= 50dBµ, No modulation
16
29
15
15
30
23
43
V
IN
= 26dBµ
3.0
21
12
36
5.0
30
5.0
31
24
7.0
41
mA
mV
mV
dBµ
%
dB
I
tot (FM)
V
O (FM)
V
i (lim)
S/N (FM)
THD (FM)
V
i (FMLED1)
V
i (FMLED2)
V
OIF1 (FM)
V
OIF2 (FM)
V
CC
=1.1V, No modulation REQ OFF
V
CC
=1.0V, No modulation REQ OFF
V
IN
= 80dBµ, No modulation
V
CC
=1.0V, V
IN
= 80dBµ,
No modulation
48
48
19
55
58
48
V
i
for V
O
= –3dB
No signals (under VCO operating)
5.5
26
38
55
1.4
61
69
7.5
44
45
9.5
61
48
mA
mV
dBµ
dB
%
dBµ
dBµ
Symbol
Condition
min.
typ.
max.
Unit
86 mVrms
mVrms
57 mVrms
mVrms
60 mVrms
FM : f = 10.7MHz, Df = 22.5kHz, f
m
= 1kHz, V
IN
= 80dBµ, AM : f = 1MHz, Mod. = 30%, f
m
= 1kHz, V
IN
= 50dBµ
MPX : f = 10.7MHz, Df = 75kHz (L+ R90%, Pilot90%), f
m
= 1kHz, V
IN
= 80dBµ
ICs for FM/AM Tuner
s
Pin Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin Name
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.
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Pin Name
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
AN7233SH
s
Application Circuit
Tuning Electric Current
470k
Ω
V1
4.7µF
+
8200pF
8200pF
Freg.
Counter
MPX Fillter
100k
Ω
4.7µF
100k
Ω
Audio
Analazer
V
+
RLO2U8 – M
MONO.
10k
Ω
15k
Ω
0.22µF
82pF
6.2k
Ω
6.2k
Ω
0.047µF
0.33µF
STEREO
SG
+
AM
24kΩ
V
CC
0.022µF
0.022µF
680pF
KV1281
10pF
+
0.1µF
+
1µF
28
27
26
25
24
1k
Ω
23
22
21
20
19
18
17
16
15
AM
OSC
ST
Ind.
VCO
LPF
MPX
SW
AM AF
Buffer
AM
Mix.
Divider
PC
AM Det.
AGC
AM
RF
IF
LEVEL
Det.
SD
FM
Det.
1
AMSG
50Ω
50Ω
1mH
0.022µF
2
3
4.7µF
+
4
5
SFU450314
6
SFE10.7MA5
7
8
9
0.01µF
10
11
3.3k
Ω
270pF
CDA10.7MG
12
13
0.01µF
14
0.01µF
+
51.7k
Ω
REQ
220k
Ω
1k
Ω
1k
Ω
SD
ST
IF Count
280Ω
510k
Ω
2SK192A
4.3k
Ω
39pF
3V
2SC1359
100
Ω
2SC1359
0.033µF
4.7k
Ω
FMSG
50Ω
0.022µF
AMIF
510k
Ω
390
Ω
1.8k
Ω
V RF
Voltage
Meter
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