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FM FRONT END
S1A0497X01
INTRODUCTION
The S1A0497X01 is a monolithic integrated circuit designed for the FM front end of portable radio cassettes or music centers. It consists of RF AMP, local OSC buffer and mixer. Compared with conventional types, it is improved in the following characteristics: -- Low supply voltage -- Strong input -- Spurious radiation 14-SOP 9-SIP
FEATURES
* * * * * Wide supply voltage range: VCC = 1.6V - 6.0V Low local oscillation stop voltage: VSTOP = 0.9V (Typ) mproved inter-modulation characteristics by double balanced type mixer circuit Low spurious radiation Built-in clamping diode in the mixer output stage
ORDERING INFORMATION
Device S1A0497X01-I0B0 S1A0497X01-S0B0 Package 9-SIP 14-SOP Operating Temperature -25C - +75C
1
S1A0497X01
FM FRONT END
BLOCK DIAGRAM
RF AMP
MIX
OSC BUFF
LOCAL OSC
VREF (8) 1 RF INPUT 2 BYPASS (11) 3 RF OUTPUT (12) 4 MIX IN (13) 5 GND (14) 6 (3) 7 (4) 8 OSC (5) 9 VCC (7)
MIX OSC OUTPUT OUTPUT
NOTE: ( ) means 14-SOP-Package NC: (1), (2), (6), (9), (10)
ABSOLUTE MAXIMUM RATINGS (Ta = 25C)
Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature PD Symbol VCC S1A0497X(9-SIP) S1A0497X(14-SOP) TOPR TSTG Value 8 600 300 - 25 - +75 - 55 - +150 C C Unit V mW
NOTE: Derated above Ta = 25 C in the proportion of 4mW/C
2
FM FRONT END
S1A0497X01
ELECTRICAL CHARACTERISTICS
(Ta = 25 C ( VCC = 5 V, f = 98MHz, fm = 1kHz, f = 22.5KHz, unless otherwise specified) Characteristic Quiescent Circuit Current -3dB Limiting Sensitivity Conversion Gain Usable Sensitivity Oscillation Voltage Oscillation Stop Voltage Symbol ICCQ VI(LIM) GV SUSA VOSC VSTOP Test Conditions VL = 0 VD (VI = 60 dB)-3dB Down VI = 60 dB S/N = 30dB fOSC = 108MHz - Min. - - 25 - 90 - Typ. 5.0 3.0 31 11 165 0.9 Max. 8.0 7.0 - - 250 1.3 Unit mA dB dB dB mV V
3
S1A0497X01
TEST CIRCUIT
(ICCQ, VI(LIM), SUSA, GV, VOSC, VSTOP)
1000pF
15pF
15pF
0.01F 100F
10k
( ) : KA22497D
Vcc
1k
4
100 L 0.01F 330 C1 C2 10pF 15k T3 0.01F Tank coil Vcc (14) (3) (4) (5) (7)
S1A0497X01
5 3 5 6 7
C.F
(8)
(11)
(12)
(13)
1 1
KSC838-0 330 0.01F C.F Vosc 150pF T2 0.01F 0.01F
2
3
4
6
7
8
9
4.7pF
S1A2245X01
4
L R
BPF
FM MPX
100pF
2
FM S.G Zo=75
T1
FM FRONT END
FM FRONT END
S1A0497X01
COIL SPECIFICATIONS (BOTTOM VIEW)
T1 (L1) FM RF
* In a Diameter of 5.5 mm f (MHz) 98 * QO 100 Turns 4 0.8 mm UEW
T2 (L2) FM OSC
* In a Diameter of 5.5 mm f (MHz) 98 * QO 100 Turns 3 0.8 mm UEW
T3 FM IFT
3 2 1
4 5 6
CO (pF) 1-3 75
f (MHz) 10.7
QO 1-3 115
Turns 1-3 12 4-6 1 KOREA TOKO 0.12 mm UEW
5
S1A0497X01
FM FRONT END
T1 (L1) FM RF
F (MHz) 98 KSS-SP1
Qo 100
Turns 4
D 5.5
WIRE 0.8
KWANG SUNG PART NO KSS-SPI
T2 (L2) FM RF OSC
F (MHz) 98 KSS-SP2
Qo 100
Turns 3
D 5.5
WIRE 0.8
KWANG SUNG PART NO KSS-SP2
T3 FM IFT
3 2 1
4 5 6
C 0 (pF) 1-3 75
F (MHz) 10.7
Q0 1-3 115
Turns 1-3 12 4-6 1
KWANG SUNG PART NO KSI-FA1
KSI-FA1
6
FM FRONT END
S1A0497X01
f(KHz), LOCAL OSCILLATION FREQUENCY DEVIATION
LOCAL OSCILLATION FREQUENCY DEVIATION, LOCAL OSCILLATION VOLTAGE.SUPLY VOLTAGE 100 300
VOSC(mV), LOCAL OSCILLATION VOLTAGE VOSC(mV), LOCAL OSCILLATION VOLTAGE
LOCAL OSCILLATION VOLTAGE AMBIENT TEMPERATURE 300 VCC = 5V fOSC = 108MHz 200
f 0 VOSC
200
-100
100
100
-200
0 2 4 6 8 10 VCC(V), SUPPLY VOLTAGE QUIESCENT CIRCUIT CURRENT-SUPPLY VOLTAGE 0
0 -20 0 20 40 60 Ta(C), AMBIENT TEMPERATURE SENSITIVITY-SUPPLY VOLTAGE 40 80
10 ICCQ (mV), QUIESCENT CIRCUIT CURRENT VI(LIM) (dB), -3dB LIMITING SENSITIVITY SUSA (dB), USABLE SENSITIVITY
8
VI = 0
f = 98MHz fm = 1KHz f = 22.5KHz dev.
30
6
20
4
SUSA 10 VI(LIM) 0 0 2 4 6 8 VCC(V), SUPPLY VOLTAGE 10
2
0 0 2 4 6 8 VCC(V), SUPPLY VOLTAGE 10
SENSITIVITY-AMBIENT TEMPERATURE 40 VI(LIM) (dB), -3dB LIMITING SENSITIVITY SUSA (dB), USABLE SENSITIVITY VCC = 5V f = 98 MHz fm = 1KHz f = 22.5KHz dev.
30
f(1KHz), LOCAL OSCILLATION FREQUENCY DEVIATION
LOCAL OSCILLATION FREQUENCY DEVIATION AMBIENT TEMPERATURE TEMPERATURE 200 VCC = 5V f = 98 MHz fm = 1KHz dev. 100
20
0
SUSA 10 VI(LIM) 0 -20 0 20 40 60 Ta(C), AMBIENT TEMPERATURE 80
100
-200 -20 0 20 40 60 Ta(C), AMBIENT TEMPERATURE 80
7
S1A0497X01
FM FRONT END
APPLICATION INFORMATION
RF AMP The RF AMP is a common base type, so the operating frequency range is improved. The GND of the bypass capacitor (Pin 2) should be located closely at Pin 5 (GND). When using the bypass capacitor at VCC-line of Pin 3. We can expect an improvement of the S/N ratio.
FM ANT BIAS
1
2
1000p
3
15p
75
B. P. F
75
T1 VCC
MIXER The mixer stage uses a double balanced type in order to protect the leakage of OSC, spurious radiation. Also, this is built into the limiter in order to improve the strong input characteristic.
VCC IF AMP
MIX OUT
6
VCC
OSC OUT MIX IN
4
BIAS
8
FM FRONT END
S1A0497X01
LOCAL OSCILLATION
The local oscillator uses a colpitts oscillator for stable oscillation at high frequency. This is built into the OSC buffer in order to stably operate the OSC frequency and OSC voltage at strong input.
VCC
MIX
OSC BUFF
8
15p
15p
9
S1A0497X01
C5 R5 0.047F
X2 G Q1 R2002 C26 4.7F /50V R C27 4.7F /50V C4 0.068F C15 450K 0.082F C16
T1 C14 1F X1 456K
C13
0.022F
4.7k
F1
330pF
APPLICATION CIRCUIT
C23
C22
0.018F
0.018F
560
560
C31
C33
C34
100k
R15
L2
L1
0.022F
0.01F
0.047F
C36
C8
C7
100F /50V
R1 33k
C42 20pF
C40 8pF C39 20pF
R14
0.022F
0.01F
C18 8pF
C1 8pF
R17 100k
R9 33k C32
4.7F/50V
R13 120
R16
100pF R5 100pF C20
C43
0.047F
R8
4.7k
L3
100 H
22k
100pF
100pF
100pF
4 3
6
270k
2
1
12 5
C45 0.047F CO1 C44
U2 5.6k 39pF
L5 100H
C48 0.047F
C49 100F/10V
BU2614 - PLL
1 2 3 4 5 6 7 8
A733
1
6
3V
GND 22pF 22pF R21
FM OSC ( KSS-SP2 : KWANG SUNG ) T1 : AM IFT ( 7MC - K5050N : KR TOKO ) AM IFT ( KSI - AA1 : KWANG SUNG ) T2 : AM OSC ( A7BR - KS141010X2 : TOKO ) AM OSC ( KSI - AO5 : KWANG SUNG ) T3 : FM IFT ( A119AC - 680122X3 : KR TOKO ) FM IFT ( KSI-FA1 : KWANG SUNG ) F1 : AHCFM2 - 450BL ( TOKO ) F2 : CFE 10.7MA ( MURATA ) X2 : CDA 10.7MG65-A ( MURATA ) X1 : CFB456F - 18 ( MURATA ) H2 : KV1236Z ( TOKO ) Q3, Q4 : KV1310NT (TOKO )
16 15 14 13 12 11 10 9
C46 100F /10V
DC - AC CONVERTER
TOKO.INC
8V 4.7k
U-COM CONTROL
4.7k C51 8pF 6pF C47 0.047F C50
10
Q1 R2002 L SW1 C35 4.7F /50V R6 2.7k R3 10k R4 Q7 C945 10k R7 390
S1A0497X 0 1 FM FRONT END
24 23 22 21 20 19 18 17 16 15 14 13
C24 4.7F /50V
1 T3
C30 100pF R12 1k C41 0.022F C38 470pF Q6 C945
2 Q5 C1674 1 2 3 4 5 6 7 8 9 10 11 12
F2 10.7MHz
3
4
5
6
7
8
9
BPF
S1A2298A0 1 IF + MPX
C12 0.047F
C2 5pF
C17 470U
470pF
C6 15pF
C11 0.047F
C3
MUTE
BUZZER
Q4 Q10 C1674 AM ANT T2
Q3
FM OSC
C29 0.047F
R10 10
C14
AM OSC
VDD
100k
GND C21 0.047F SD/IF
ST
0.6/ 4t
10k 223pF 2.2F/50V 10k 2.2k
RADIO ON
L1 :
3
FM RF ( KSS-SP1 : KWANG SUNG )
5CDM - 658N - 1085
12 3 4
L2 :
TK11822M R20
FM FRONT END

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