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FM NOISE CANCELLER S1A2272A01
INTRODUCTION
The S1A2272A01 is a monolithic integrated circuit for the FM
noise canceller used in car stereos.
It is used in combination with a PLL FM multiplex demodulator
with a pilot signal canceller.
FEATURES
• Operation voltage range: VCC = 8V − 15V
• Low quiescent circuit current
• Low distortion: THD = 0.02% at VI = 300mV
• Pilot signal compensation
• Built-in monostable multivibrator.
• Variable input type noise AGC system.
ORDERING INFORMATION
Device Package Operating Temperature
S1A2272A01-S0B0 16-SOP-225A −20°C − +75°C
16−SOP−225A
BLOCK DIAGRAM
PLT CAN
SUB IN(-)
16 15 14 13 12 11 10 9
Vcc OUTPUT SUB IN
SIGNAL
INVERSION
AMP
SUB AMP
1 2 3 4 5 6 7 8
GATE
PW ADJ
MULTI
VIBRATOR
NOISE
AGC ADJ
LPO LPI BC INPUT GND
NOISE
DET ADJ
NOISE DETECTOR
LP AMP
BYPASS
HPO HPI
BUFFER
HP AMP
1
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S1A2272A01 FM NOISE CANCELLER
ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)
Characteristic Symbol Value Unit
Supply Voltage V
CC
16 V
Power Dissipation PD 300 Min
Operating Temperature T
Storage Temperature T
OPR
STG
−20 − + 75 °C
−40 − + 125 °C
ELECTRICAL CHARACTERISTICS
(Ta = 25°C, VCC = 12V, 300 mV, f = 1kHz, unless otherwise specified)
Characteristic Symbol
Quiescent Circuit Current I
Voltage Gain G
Output Voltage V
CCQ
V
O
V7 = 300 mV, f = 1kHz Output -0.2 0.8 1.8 dB
V7 = variable, f = 1kHz
Total Harmonic Distortion THD V7 = 300mV, f = 1kHz Output 0.01 0.03 K%
Input Resistance R
Low pass AMP Gain G
V (LP)
High pass AMP Gain A
VH
V7 = 300mV, f = 1kHz − 36 51 67 dB
I
V5 = 300mV, f = 1kHz V
V9 = 100mV
f = 200kHz
Test Conditions
Min. Typ. Max. Unit
Input Pin Output Pin
− − − 16 25 mA
Output
THD = 1%
4
V
10
1.3 − − V
0 0.83 1.58 dB
1.58 2.92 4.35 V
Inverted Amp Distortion THD f = 19kHZ Output 300 − 0.1 %
Inverted Amp Dynamic
Range
Inverted Amp Gain G
Output Noise Voltage V
Gate Time t
O
V15 = 100mV
f = 19kHz
V
V15 = 100mV
V
f = 19kHz
Bypass V7
NO
G
V15 to GND
VO = 100mV
f = 1kHz
p-p
, 1µs,
Output
THD = 1%
− − − mV
Output 0 2.28 4.08 dB
Output,
100 kHz LPF
− 30 60 µV
Output 13 21 30 µsec
Noise Sensitivity SN V7, 1µs, f = 1kHz Output − − 30 mV
p-0
2
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FM NOISE CANCELLER S1A2272A01
V10
V9
V15
TEST CIRCUIT
100k
Ω
4.7µF4.7µF
6800pF
3.9k
4.7µF
6.8kΩ
Ω
2000pF
14 1316 15
0.01µF
F
Ω
µ
22
47k
820Ω
12 11 10
S1A2272A01
1 2 3 4 7
100µ
F
4.7µ
F
4.7µ
F 68pF
4.7µ
5 6
F
0.01µF
1200pF 680pF
4.7kΩ4.7kΩ4.7k
680pF
2.2k
22k
2.2k
2.7k
Ω
Ω
Ω
270pF270pF270pF
Ω
9
270pF
8
4.7µ
F
Ω
4.7k
Ω
Vcc = 12V
OUTPUT V4 V5
V7
INPUT
3
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S1A2272A01 FM NOISE CANCELLER
4
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FM NOISE CANCELLER S1A2272A01
5
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S1A2272A01 FM NOISE CANCELLER
OUTPUT
OUTPUT
APPLICATION CIRCUIT
Vcc
L
pilot cancel
6800pF
Vcc
Ω
Ω
10 12 14
1µF
0.01µF
R
3.3k
0.015µF
3.3k
0.015µF
6 82 4
S1A2266X
1 3 5 7 13
50k
Ω
3300pF
6.8kΩ
2000pF
Ω
47k
9 11
22µF
5.6k
Ω
3.3µF
2.2µF
0.033µF
1k
Ω
12k
Ω
* 1000pF
Ω
* polyester
film cap.
10k
16
15
100k
Ω
3.9k
14 1316 15
Ω
S1A2272A01
1 2 3 4 7
4.7µ
F
F
100µ
20k
Ω
0.047µ
2.2k
Ω
12 11 10
5 6
68pF
1200pF
680pF
680pF
F
0.01µF
4.7k
4.7k
4.7k
10k
0.01µF
9
8
F
4.7µ
Ω
Ω
Ω
Ω
270pF
270pF
270pF
270pF
INPUT
2.2k
2.2k
2.7k
22k
Ω
Ω
Ω
Ω
6
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