Page 1
DUAL EQ AMP WITH ALC S1A0241A01
INTRODUCTION
9−SIP
The S1A0241A01 is a monolithic integrated clrcuit consisting of
a dual equalizer amplifier with ALC, and it is suitable for stereo
radio cassette-tape recorders.
FEATURES
• Dual equalizer amplifier with built-in ALC circuit Low
noise; V
• High open loop voltage gain: 80dB (Typ)
• Wide operating supply voltage range:
VCC = 4.5V − 14V
• Good ALC response balance between channels
• Input coupling capacitor unnecessary
• Diode or transistor for ALC unnecessary
• Minimum number of external parts required
= 1.0µV (Typ)
NI
ORDERING INFORMATION]
Device Package Operating Temperature
S1A0241A01-I0B0 9−SlP −20°C — + 75°C
BLOCK DIAGRAM
−
+
ALC
1 2 3 4 5 6 7 8 9
NF1
INPUT1 OUTPUT1 GND
ALC
CONT
ALC
CONT
−
+
ALC
V
OUTPUT2 INPUT2 NF2
CC
1
Page 2
S1A0241A01 DUAL EQ AMP WITH ALC
ABSOLUTE MAXIMUM RATINGS (Ta = 25°C)
Characteristic Symbol Value Unit
Supply Voltage V
Power Dissipation P
Operating Temperature T
Storage Temperature T
NOTE: Derated above Ta = 25 °C in the propotion of 5.5 mW/°C
CC
D
OPR
STG
16 V
(NOTE) 550 mW
−20 — +75 °C
−20 — +125 °C
ELECTRICAL CHARACTERISTICS
(Ta = 25°C, VCC = 7V, f = 1kHz, unless otherwise specified)
Characteristic Symbol Test Conditions Min. Typ. Max. Unit
Quiescent Circuit Current I
CCQ
Open Loop Voltage Gain G
Closed Loop Voltage Gain G
Output Voltage V
Total Harmonic Distortion THD VO = 0.3V − 0.1 0.3 %
Equivalent Input Noise Voltage V
VI = 0 1.5 3.5 4.5 mA
VO = 0.3V 70 80 − dB
VO
VO = 0.3V 45 48 50 dB
VC
THD = 1% 0.6 1.2 − V
O
RG=2.2kΩ, BW (−3dB)=20Hz − 20kHz − 1.0 2.0 µV
NI
Input Resistance R
ALC Range ∆V
ALC Balance CB
I
ALCRG
ALCVI
− 15 25 45 kΩ
= 3.9kΩ, THD = 10% 40 45 − dB
= 1mV − 0 2.5 dB
2
Page 3
DUAL EQ AMP WITH ALC S1A0241A01
TEST CIRCUIT
S1A0241A01
SW1
1 2 3 4 5 6
0.027µF
SW2
4.3kΩ120k
18k
Ω
39
Ω
100µF
1
Ω
SW3
2
10µF
A
10k
Ω
2 3
2.2k
Ω
SW5
1
SG
Vcc
SW4
3.9kΩ
987
0.027µF
22µF
1MΩ
SW6
220
Ω
330µF
SW7
C
D
SW8
2 3
1
2.2k
Ω
SG
3.9kΩ
SW9
10µF
10k
1
2
Ω
120k
B
SW10
4.3k
Ω
Ω
18k
Ω
39
Ω
SW11
100µF
3
Page 4
S1A0241A01 DUAL EQ AMP WITH ALC
TEST METHOD
Symbol S1 S2 S3 S4 S5 S6 S7 S8 S9 S10 S11
I
CCQ
G
VO
G
VC
CH -1 OFF ON 1 ON 1 ON ON 3 1 OFF ON
ON OFF 1 ON 3 ON ON 3 1 OFF ON
ON OFF 1 ON 1 ON ON 3 1 OFF ON
THD CH -1 OFF ON 1 ON 1 ON ON 3 1 OFF ON
V
O
V
NI
CH -1 OFF ON 1 ON 1 ON ON 3 1 OFF ON
CH -1 OFF ON 1 ON 2 ON ON 3 1 OFF ON
CH -2 ON OFF 1 ON 3 ON ON 2 1 ON OFF
∆ V
ALC
CH -1 OFF OFF 2 OFF 1 OFF ON 3 1 OFF ON
CB
ALC
OFF OFF 2 OFF 1 OFF OFF 1 2 OFF OFF
4
Page 5
DUAL EQ AMP WITH ALC S1A0241A01
APPLICATION CIRCUIT
−
+
+
ALC
CONT
1M
ALC
1 2 3 4 5 6 7 8 9
18K
R1
39
+ + +
100µ
3.9K
22µ
10µ 10µ
OUTPUT2INPUT2
ALC
+ + + +
330µ
−
+
10µ
INPUT2OUTPUT2
18K
3.9K
10µ
220
Vcc
7V
R2
39
100µ
NOTE:ON playback, connect the time constant circuit as shown below, instead of R1 of Pins 1, 3 and R2 of
Pins 7, 9, which are used in the NAB.
120kΩ
4.3kΩ
PIN 1,
PIN 7
PIN 3,
PIN 9
0.027µ
5
Page 6
S1A0241A01 DUAL EQ AMP WITH ALC
REC IN
PB OUT
APPLICATION CIRCUIT 1
S1A0241A01
M
85KHz
85KHz
1 2 3 4 5 6
120k
Ω
100µF/16V
10µF/16V 10µF/16V
P R P
0.022µF
4.7k
Ω
(M)
22k
Ω
39
Ω
0.0022µF(M)
15k
Ω
0.0022µF(M)
15k
Ω
22µF/16V
100µF/16V
1M
Ω
220
Ω
220
Ω
10µF/16V 10µF/16V 100µF/16V
R
0.022µF
(M)
R
120k
4.7k
987
Ω
Ω
22k
Ω
39
Ω
2.7kΩ
P
0.0022µF(M)
0.0022µF(M)
120k
Ω
L
GND
R
2.7kΩ
120kΩ
L
GND
R
Bias OSC
220pF
R
1000pF
P
0.015µF(M)
0.022µF(M)100µF/16V
10k
Ω
C1008
0.022µF
(M)
22
P
R
POWER
Ω
ON/OFF
GND
VCC
- P : PLAY
- R : RECORD
6
Loading...