DUAL LOW NOISE EQ AMP
S1A2221A01
1
INTRODUCTION
The S1A2221A01 is a monolithic integrated circuit for car ste-
reos,which possesses 2-channel low noise amplifiers and a
regulated power supply.
FEATURES
Suitable for a car stereo
Low noise amplifier
Voltage regulator included
Good ripple rejection
High channel separation (65dB Typ)
Minimum number of external parts required
ORDERING INFORMATION
BLOCK DIAGRAM
Device
Package
Operating Temperature
S1A2221A01-I0U0
8
-
SlP
-
20
C -- +70
C
8
-
SIP
1
2
3
4
5
6
7
8
+
-
AMP1
VOLTAGE
REGULATOR
+
-
AMP1
INPUT1
NF1
OUTPUT1
V
CC
OUTPUT2
NF2
INPUT2
GND
S1A2221A01
DUAL LOW NOISE EQ AMP
2
ABSOLUTE MAXIMUM RATINGS (Ta = 25
C)
ELECTRICAL CHARACTERISTICS
(T = 25
C, V
CC
= 12V, R
L
= 10K, f = 1kHz, NAB, unless otherwise specified)
Characteristic
Symbol
Value
Unit
Supply Voltage
V
CC
18
V
Power Dissipation
P
O
200
mW
Operating Temperature
T
OPR
-
20 -- +70
C
Storage Temperature
T
STG
-
40 -- +125
C
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Quiescent Circuit Current
I
CCQ
V
I
= 0
-
6.0
9.0
mA
Open Loop Voltage Gain
G
VO
-
65
80
-
dB
Closed Loop Voltage Gain
G
VE
V
O
= 0.5 V
33
35
37
dB
Output Voltage
V
O
THD = 1%
0.6
1.0
-
V
Total Harmonic Distortion
THD
V
O
= 0.5 V
-
0.1
0.3
%
Input Resistance
R
I
-
-
150
-
K
Equivalent Input Noise Voltage
V
NI
R
G
= 2.2k
BW (
-
3dB) =15Hz
-
30kHz
-
1.0
2.0
V
Cross Talk
CT
R
G
= 2.2k
50
65
-
dB
DUAL LOW NOISE EQ AMP
S1A2221A01
5
APPLICATION INFORMATION
External Components (Refer to test circuits)
C
1
(C
10
): Noise filter
These capacitors prevent radio interference in strong electric fields. The recommended value is 1000 pF.
C
2
(C
8
):Input coupling capacitor
The recommended value is 10
F. If made too small, the low frequency characteristics will change for the
worse, but too large a value will increase the rising time when power is applied.
C
1
(C
9
):Negative feedback capacitor
The lower cut-off frequency depends on the value of these capacitors and is determined as follows:
f
L
: Low cut-off frequency
If the value of these capacitors is made larger, the starting time of the amplifier is delayed further.
C
5
(C
6
): Output coupling capacitor
The recommended value is 10
F.
R
2
, R
3
, C
7
(R
4
, R
5
, C
4
): Equalizer network
The time constants of standard NAB characteristic are as follows.
R
1
(R
6
): Feedback component
The closed loop gain is determined approximately by the following relationship.
Choose R
2
, R
3
, (DC resistance of NAB element) as 100 K approximately.
Tape speed
9.5 cm/sec
4.75 cm/sec
T2
T1
C
7
(R
2
+ R
3
)
R
2
, C
7
3180
sec
90
sec
1590
sec
120
sec
C
3
(C
8
) =
1
2
f
L
R1
+
47
R
1
R
2
R
3
C
7
GVC = 20 log (dB)
Z = R
2
+ R
3
//C
7
Z + R
1
R
1
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