5 DOT LED LEVEL METER DRIVER
S1A2284A01/02
1
INTRODUCTION
The S1A2284A01 and S1A2284A02 are monolithic integrated
circuits designed for 5-dot LED level meter drivers with a built-
in rectifying amplifier. It is suitable for AC/DC level meters such
as VU meters or signal meters.
FEATURES
High gain rectifying amplifier included (G
V
= 26dB)
Low radiation noise when LED turns on
Logarithmic indicator for 5-dot bar type LED (
-
10,
-
5, 0, 3, 6dB)
Constant current output
S1A2284A01: lo = 15mA (Typ)
S1A2284A02: Io = 7mA (Typ)
Wide operating supply voltage range:
V
CC
= 3.5V
-
1 6V
Minimum number of external parts required
ORDERING IN FORMATION
Device
Package
Operating Temperature
I
D
S1A2284A01-I0U0
9
-
SIP
-
20
C
-
+ 80
C
15mA
S1A2284A02-I0U0
7mA
9
-
SIP
S1A2284A01/02
5 DOT LED LEVEL METER DRIVER
2
BLOCK DIAGRAM
NOTE: Capacitor to be omitted when used as a DC input signal meter
ABSOLUTE MAXIMUM RATINGS (Ta = 25
C)
NOTE: 11mW/
C is decreased at higher temperature than T
a
= 25
C.
Characteristic
Symbol
Value
Unit
Supply Voltage
V
CC
18
V
Amp Input Voltage
V
8-5
-
0.5
-
V
CC
V
Pin 7 Voltage
V
7-5
6
V
D Terminal Output Voltage
V
D
18
V
Circuit Current
I
CC
12
mA
D Terminal Output Current
I
D
20
mA
Power Dissipation
P
d
1100
mW
Operating Temperature
T
OPR
-
20
-
+ 80
C
Storage Temperature
T
STG
-
40
-
+ 125
C
1
2
3
4
5
6
7
8
9
D5
D4
D3
D2
D1
LED DRIVER
REFERENCE VOLTAGE
D1
D2
D3
D4
GND
D5
OUTPUT
INPUT
Vcc
5 DOT LED LEVEL METER DRIVER
S1A2284A01/02
3
ELECTRICAL CHARACTERISTICS
(T
a
= 25
C, V
CC
= 6V, f = 1kHz, unless otherwise specified)
NOTE: Definition of 0dB: input voltage level when V
CL (ON)3
turn ON (50mV)
TEST CIRCUIT
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Circuit Current
I
CCQ
V
i
= 0V
-
6
8.5
mA
D Output Current
S1A2284A01
I
O
V
i
= 0.15V
11
15
18.5
mA
S1A2284A02
5
7
9.5
Input Bias Current
I
BIAS
-
-
1
-
0
A
Amp Gain
G
V
V
I
= 0.1 V
24
26
28
dB
V
CL(ON)1
-
12
-
10
-
8
V
CL(ON)2
-
6
-
5
-
4
Comparator ON Level
V
CL (ON)
V
CL(ON)3
-
-
0
-
dB
V
CL(ON)4
2.5
3
3.5
V
CL(ON)5
5
6
7
D1
10
F/16V
10k
S1A2284A01/02
1
2
3
4
5
6
9
8
7
D2
D3
D4
D5
10k
2.2
F/16V
INPUT
C1
R
Vcc
C2
C2 : AC in, 2.2
F is used.
DC in, 2.2
F is shorted.
S1A2284A01/02
5 DOT LED LEVEL METER DRIVER
4
The recommended value of R at T
a
(max) = 60
C.
By changing the time constant C
1
and C
2
, the response, attack and release time may be varied. In the above ap-
plication conditions, power dissipation may be operated at higher levels than the absolute maximum ratings.
The wattage of R is to be determined by the total LED current and R value recommended by the R table.
V
CC
(V)
8
-
12
10
-
14
12
-
16
R(
)
47
68
91
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