AM/FM 1 CHIP RADIO
S1A0427B01
1
INTRODUCTION
The S1A0427B01 is a monolithic integrated circuit designed for
portable AM/FM radios or AM/FM clock radios.
FUNCTIONS
FEATURE
Portable AM/FM 1-chip radio
Wide operating supply voltage range: V
CC
= 3V
-
12V (Approximately )
(Depending on the internal regulator tolerance)
Recommended operating suply voltage:
V
CC
= 4.5V
-
9V
When using the AC line as an internal shunt regulator mode, it is possible to use a low cost application without
a transformer (approximately 42mA)
IF AMP gain is determined by the DC voltage appearing at IC Pin 16.
Power output: PC = 0.28W (Min.) at THD = 10% (Vcc = 5.5V/8
).
ORDERING INFORMATION
AM RF & MIX
AM Local OSC
AM AGC
AM/FM IF AMP
AM/FM DET
Audio Power AMP
Regulator
FM AFC Control
Vcc
4.5V
6.0V
7.5V
9.0V
Line Operated
R
L
8
O
O
O
X
X
16
O
O
O
O
X
45
O
O
O
O
O
Device
Package
Operating Temperature
S1A0427B01-D0B0
16
-
DlP
-
300A
20
C
-
+70
C
16
-
DlP
-
300A
S1A0427B01
AM/FM 1 CHIP RADIO
2
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATINGS (Ta = 25
C)
Character istic
Symbol
Value
Unit
Supply Voltage
V
CC
13
V
Power Dissipation
P
D
600
mW
Supply Current
I
CC
44
mA
Thermal Resistance Junction to Ambient
R
EJA
100
C/W
Operating Temperature
T
OPR
-
20
-
+70
C
Storage Temperature
T
STG
-
55
-
+150
C
5
6
7
8
9
10
11
12
4
3
2
1
16
15
14
13
MIX
RF
OSC
AM F/E
POWER
AMP
AM/FM
IF
VOLTAGE
REGULATOR
AM/FM
DET
AM IF
OUTPUT
RF
GND
AM/FM
IF INPUT
IF
BYPASS
AFC AGC
BYPASS
AM/FM
IF OUTPUT
V
CC
IF DET
INPUT
AM OSC
AM RF
INPUT
RF
BYPASS
AUDIO
DET OUT
AUDIO
POWER
RIPPLE
REJECTION
AUDIO
GND
AUDIO
POWER OUT
AM/FM 1 CHIP RADIO
S1A0427B01
3
ELECTRICAL CHARACTERISTICS
(Ta =25
C, V
CC
= 5.5V, fm = 1kHz, AM: f = 1MHz, 30% Mod, FM: f = 10.7MHz
f = 22.5kHz, unless otherwise specified)
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
FM
Quiescent Circuit
Current
I
CCQ
SW: FM, Vcc = 3V
7
12
17
mA
SW: FM, Vcc = 9V
10
17
23
Pin 16 Terminal Voltage
V
16(FM)
SW: FM, Vcc = 9V, V
I
= 0
2.0
2.4
3.1
V
-3 dB Limiting Sensitivity
V
I(LIM)
SW: FM,
-
3dB
V
16
= 2.4V, V
R
Min
-
57
-
dB
AM
Internal Regulated Vtg.
V
CC
SW: AM, I
CC
= 42mA
12
13.2
14.0
V
Pin 16 Voltage
V
16 (AM)
SW: AM, V
CC
= 9V, V
I
= 0
1.4
-
1.9
V
Maximum Sensitivity
S
MAX
SW: AM, V
CC
= 12V
V
I
= 37dB
, R
L
= 8
1.5
3.0
-
V
Signal to Noise Ratio
S/N
V
I
= 37.5dB
, R
L
= 8
P
O
= 50mW
15
20
-
dB
PWR
AMP
Output Power
P
O
f = 1kHz, THD = 10%
V
R
Min, R
L
= 8
0.28
-
-
W
Total Harmonic
Distortion
THD
I
CC
= 42mA, R
L
= 45
f = 1kHz, V
O
= 2V V
R
Min
-
0.5
4.0
%
Voltage gain
G
V
f = 1kHz, R
L
= 8
, P
O
= 50mW
-
41
-
dB
S1A0427B01
AM/FM 1 CHIP RADIO
4
TEST CIRCUIT
1.2k
470
F
S1A0427B01
1
2
3
4
7
12
11
10
9
8
5
6
14
13
16
15
6
4
1
3
2
4
6
1
3
2
6
4
1
3
2
4
6
3
1
2
6
4
1
3
2
6
4
1
3
2
6
4
1
3
2
R8
C17
0.047
F
C16
C18
470pF
V16
R8
4.7k
C15
10pF
T6
T5
T4
SW
FM
AM
470
F
C13
220
F
C12
0.001
F
C11
470
F
C11
R
L
R6
22k
V
R
100k
0.022
F
C10
0.01
F
R5
(R = )
8
C8
50pF
50
R4
3.3
F
C19
0.047
F
C7
L2
L1
FM
AM SW
T2
T3
51pF
C6
C5
680pF
0.022
F
C4
0.022
F
C2
220pF
C3
50
R3
R2
10k
50
R1
2pF
FM IF INPUT
AM RF INPUT
AUDIO
DET OUTPUT
AUDIO
POWER INPUT
POWER
OUTPUT
GND
V
CC
AM/FM 1 CHIP RADIO
S1A0427B01
5
APPLICATION INFORMATION
-- EXTERNAL COMPONENTS
Part
Number
Purpose
Typical
Influence
Smaller Than Typ
Greater Than Typ
R5
Am gain Control
47k
(33K
-
)
Low AM gain
AGC Distortion increase,
High gain
R7
FM detector
damper
4.7k
Low detector output, stable IF gain,
low FM gain
Sharp IF AMP curve
R8
FM gain adjust
470
Low FM gain
High gain, but noise
increase
C2
IF bypass
0.022
F
Should not be less than 0.005
F
High IF Gain,
S/N ratio degrade
C4
IF filter
0.022
F
Removal may cause IF oscillation
No influence
C7
AM bypass
0.047
F
Low gain
Using over 1 will cause
FM distortion at small
signal
C9
Detector filter
0.01
F
Unstable IF AMP oscillation
Poor FM frequency
response
C10
Audio coupling
0.022
F
Lower sensitivity, poor low frequency
response
Bass boost affects
de-emphasis curve
C11
Audio Input High-
cut
0.001
F
Audio oscillation
Poor response
C12
Ripple filter
220
F
Poor frequency response & Low gain
Improve AC Hum
C13
Audio output
coupling
470
F
Poor low frequency response
Can achieve optimum
output power
C14
Power line filter
470
F
Poor AC Hum
Improve AC Hum
C15
FM detector
phase-shift
10pF
Narrow IF bandwidth
Wide IF bandwidth
C16
High freq.
(IF) bypass
0.047
F
Removal will cause fm oscillation
No influence
C17
AN AGC time
constant and high
frequency (IF)
bypass
0.047
F
Charging not recommended
-
S1A0427B01
AM/FM 1 CHIP RADIO
6
FUNCTION DESCRIPTION (PIN 16 DC VOLTAGE)
1. IF Gain Grouping Table
(1) Test Condition: V
CC
= 9V (Pin 13).
Pin 8 resistance (AM) = 47k
Pin 16 resistance (FM) = 1.2k
(2) Grouping Table
2. IF gain is determined by DC voltage appeared at IC Pin 16.
The DC voltage at Pin 16 to the following values:
AM = 1.4
-
1.65V (DC)
FM = 1.9
-
2.10V (DC)
AM gain can be adjusted by the loading resistor value of Pin 8 (AM) from 33k
to infinity.
FM gain can be adjusted by the loading resistor value of Pin 16 (FM) from 3k
to 680.
Recommended resistance (Pin 8, Pin 16).
Pin 8 (AM) = 47k
Pin 16 (FM) = 470k
V16(AM)
V16(FM)
1.4 - 1.7 V
2.4
-
2.85V
2B
AM/FM 1 CHIP RADIO
S1A0427B01
7
APPLICATION CIRCUIT
S1A0427B01
1
2
3
4
7
12
11
10
9
8
5
6
14
13
16
15
6
4
1
3
2
6
4
1
3
2
6
4
1
3
2
6
4
1
3
2
220 pF
T6
T4
T2
T3
20pF
T1
NOTES : 1. SW1 : AM Position.
2. * Marking : Value of C and R have to be selected for good conditions
V
CC
6
4
1
3
2
6
4
1
3
2
6
4
1
3
2
T5
8.2pF
AM OSC
L1
0.022
F
0.01
F
*R
22k
50k
V
R
0.002
F
100
F
2.2
0.1
F
220
F
SP
100
F
100
F
330
F
1000pF
AM
FM
SW1B
3.3k
1.5 pF
20pF
15pF
L3
*
(180k
)
680
2pF
GND
ANT
KSC
1674-0
L4
820pF
0.047
F
1.8pF
5.1pF
* (56k
)
2.2
F
1000pF
1000pF
L5
1k
220
* C
220pF
680
0.047
F
0.022
F
AM
FM
SW1A
GND
0.047
F
AM BAR ANT
L2
4.7k
10pF
S1A0427B01
AM/FM 1 CHIP RADIO
8
COIL SPECIFICATION 1
Coil No.
f
Q
O
Turns
C
O
Connections (KOREA TOKO)
T1
10.7MHz
120
1-3
8T
150 pF
T2
10.7MHz
70 min
1-3
11T
75
5 pF
4-6
2T
T3
(T6)
455kHz
80 min
1-2
91T
180
5 pF
2-3
55T
4-6
6T
T4
10.7MHz
45 min
1-3
11T
82
3 pF
T5
10.7MHz
25 min
1-3
7T
180 pF
4-6
7T
L1
AM Local
Oscillator
90 min
1-3
86T
4-6
7T
L2
AM ANT
200
1-2
(L = 560
H )
138T
3-4
9T
L3
FM ANT
0.8mm
UEW
TAP
5T
0.5T
L4
Trap
0.32mm
UEW
10T
L5
FM
Oscillator
0.8mm
UEW
4T
-
4
6
2
3
1
3
2
1
4
6
3
2
1
4
6
4
6
2
3
1
3
2
1
4
6
3
2
4
6
1
1
2
3
4
core: 10 mm
X 55 mm
V.C
GND
Pin 6
GND
7 mm
5 mm
7 mm
5 mm
7 mm
5 mm
AM/FM 1 CHIP RADIO
S1A0427B01
9
Coil No.
f
Q
0
Turns
C.L.
Connections (KWANG SUNG PART NO)
T1
10.7MHz
120
1-3
8T
150pF
KSI-FD5
T2
10.7MHz
70min
1-3
11T
75pF
KSI-FA2
4-6
2T
T3
(T6)
455kHz
80min
1-2
91T
180pF
KSI-AA4
2-3
55T
4-6
6T
T4
10.7MHz
45min
1-3
11T
82pF
KSI-FD4
T5
10.7MHz
45min
1-3
7T
180pF
KSI-FA4
4-6
7T
L1
AM
Local
Oscillator
90min
1-3
86T
KSI-AO4
4-6
7T
L2
AM
ANT
200
1-2
L = 560uH
138T
KSA-ANT560
4-6
9T
3
2
1
3
2
1
4
6
3
2
1
4
6
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
1
2
3
4
core: 10 mm X 55 mm
V.C
GND
Pin 6
GND
S1A0427B01
AM/FM 1 CHIP RADIO
10
L3
FM
ANT
0.8mm
UEW
5T
KSS-SP5
0.5T
L4
Trap
0.32mm
UEW
10T
KSS-SP4
L5
FM
Oscillator
0.8mm
UEW
4T
KSS-SP3
Coil No.
f
Q
0
Turns
C.L.
Connections (KWANG SUNG PART NO)
7 mm
5 mm
7 mm
5 mm
7 mm
5 mm
AM/FM 1 CHIP RADIO
S1A0427B01
11
APPLICATION CIRCUIT 2
S1A0427B01
1
2
3
4
7
12
11
10
9
8
5
6
14
13
16
15
T6
T2
T3
T1
V
CC
T5
0.02
F
0.01
F
22k
50k
V
R
0.001
F
100
F
SP
470
F
47
pF
2pF
ANT
KSC
1674-0
L4
2.2k
22
AM
FM
L5 (AM BAR ANT)
4.7k
10pF
47k
220
F
2.2k
4.7k
T5
T4
0.04
F
220
F
0.02
F
0.04
F
1k
680
L3
AM
FM
47
pF
L1
30pF
330
100k
0.005
F
0.01
F
0.02
F
2.2k
L2
0.02
F
100
F
20pF
40pF
470
100k
300
pF
0.005
F
5
pF
5
pF
KSC
1674-0
100
1N60
0.01
F
0.01
F
1k
0.04
F
140pF
470
L6
S1A0427B01
AM/FM 1 CHIP RADIO
12
COIL SPECIFICATION 2
Coil No.
f
Q
0
Turns
C.L.
Connections
T1
10.7MHz
90
1-3
11
82pF
4-6
3
T2
10.7MHz
60
1-3
5
390pF
4-6
2
T3
455kHz
100
1-2
127
180pF
2-3
28
4-6
10
T4
10.7MHz
45 (Min)
1-3
11
82 pF
T5
10.7MHz
25 (Min)
1-3
7
180pF
4-6
7
T6
455kHz
100
1-2
50
390pF
2-3
50
L6
796kHz
100
1-3
100
360
H
4-6
10
3
2
1
4
6
3
2
1
4
6
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
AM/FM 1 CHIP RADIO
S1A0427B01
13
Coil No.
f
Q
0
Turns
C.L.
Connections (KWANG SUNG PART NO)
T1
10.7MHz
90
1-3
4-6
82pF
KSI-FA3
11
3
T2
10.7MHz
60
1-3
4-6
390pF
KSI-FA5
5
2
T3
455kHz
100
1-2
127
180pF
KSI-AA3
2-3
28
4-6
10
T4
10.7MHz
45min
1-3
11
82pF
KSI-FD4
T5
10.7MHz
45min
1-3
7
180pF
KSI-FA4
4-6
7
T6
455kHz
100
1-2
50
390pF
KSI-AA2
2-3
50
L6
796kHz
100
1-3
100
360uH
KSI-A03
4-6
10
3
2
1
4
6
3
2
1
4
6
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
3
1
4
6
2
S1A0427B01
AM/FM 1 CHIP RADIO
14
NOTES
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