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FM 1 CHIP RADIO S1A0429A01
INTRODUCTION
16−SOP−225
The S1A0429A01 is a monolithic integrated circuit designed for
Portable FM radios.
It consists of an RF input stage, mixer, IF, mute control and
loop (earphone drive) Amp.
It is suitable for a pocket-size radio.
FUNCTIONS
• RF input stage • Local OSC
• Mixer • IF Amp
• Mute control • Earphone drive amp
FEATURES
• Minimum number of external parts required
• Single trimmer tuning
• No FM det coil
• FLL IF detect system (76kHz)
• Operating voltage: VCC = 1.8V − 6.0V
ORDERING INFORMATION
Device Package Operating Temperature
S1A0429A01-S0B0 16−SOP−225 −10°C − + 70°C
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S1A0429A01 FM 1 CHIP RADIO
BLOCK DIAGRAM
MPX FILTER
MPX
FILTER
MUTE CONTROL
DEMODULATOR
& CORRELATOR
1 2 3 4 5 6 7 8
DEMOD OUT
+
−
MUTE
AF
MPX
OUTPUT
GND
BYPASS RF IN IF FILTER
RF
AMP
MIX
STAB
Vcc
OSC
TUNE
IF IN(-) IF FILTER
IF STAGE
SINGLE
STRENGTH AF
910111213141516
ABSOLUTE MAXIMUM RATINGS ( Ta = 25°C )
Characteristic Symbol Value Unit
Supply Voltage V
Oscillator Voltage V
Operating Temperature T
Storage Temperature T
Thermal Resistance Junction to Ambient R
CC
OSC
OPR
STG
EJA
7 V
−0.5 − + 0.5 V
−10 − + 70 °C
−55 − + 150 °C
300 K/W
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FM 1 CHIP RADIO S1A0429A01
ELECTRICAL CHARACTERISTICS
MONO CONDITION: f = 98MHz, fm = 1kHz, ∆f = ± 22.5kHz, V = 50dBµ, Ta = 25°C, VCC = 3V
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Quiescent Circuit Current I
Sensitivity
Signal to Noise Ratio S/N1 − − 60 − dB
Total Harmonic
Distortion
AM Rejection Ratio AMR
MONO
Oscillator Voltage V
AFC Range ∆AFC − − 160 − kHz
Mute Range MR − − 120 − kHz
Band Width BW
AF Output Voltage V
CCQ
S
VI1
S
VI2
THD1
THD2
OSC
O1
VI = 0 − 6.3 − mA
−3dB: Mute Disable
SIN = 26dB: Mute Enable
∆f = ± 22.5kHz
∆f = ± 75kHz
AM: fm = 1kHz, m = 80%
FM: fm = 1kHz, ∆f = 75kHz
−
−
− 50 − dB
12
17
0.7
2.3
−
−
dBµ
dBµ
%
%
− − 250 − mV
∆VO = 3dB
Pre-Emphasis t = 5kHz
− 10 − kHz
− − 90 − mV
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S1A0429A01 FM 1 CHIP RADIO
TEST CIRCUIT
Field Strength
75
S.G
Ω
8.2k
0.1µF
Ω
AF OUT PUT
VCC
10k
220pF0.1µF 3300pF 220pF
14 1316 15
12 11 10
S1A0429A01
1 2 3 4 7
0.01µF
Ω
0.01µF
0.1µF
Figure 1. Test Circuit for Mono Operation
5 6
56nH
4700pF
0.1µF
9
8
820pF
1500pF
4
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FM 1 CHIP RADIO S1A0429A01
Field
Strength
L
R
(MONO.STEREO)
STEREO
DECODER
680pF 2200pF
Vmux
S.G
VCC
Rs = 75
Ω
1k
Ω
0.1µF
3300pF 220pF
14 1316 15
220pF
12 11 10
3300pF
S1A0429A01
1 2 3 4 7
0.01 µF
0.01 µF
0.1µF
Figure 2. Test Circuit for Stereo Operation
5 6
56nH
0.1µF
1500pF
9
8
10k
330pF
Ω
0.1µF
5
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S1A0429A01 FM 1 CHIP RADIO
APPLICATION CIRCUIT
AF OUTPUT
FM ANT
10k
Ω
220pF
0.1µF
1k
56pF
Ω
3300pF
68pF
3300pF
8.2k
0.1µF
Ω
14 1316 15
12 11 10
9
S1A0429A01
1 2 3 4 7
0.01µF
0.1µF
0.01µF
V
CC
5 6
22pF
39pF
56nH
0.1µF
8
820pF
1500pF
6
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