5-DOT DUAL LED LEVEL
METER DRIVER
DESCRIPTION
The
KA2284
is a monolithic integrated circuit
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(Gv=26dB)
*Low radiation noise when LED turns on
*logarithmic indicator for 5-dot LED of bar type.
*Constant current output( 15mA)
*Wide operating supply voltage(3.5V~16V)
*Not necessary diode or transistor for ALC
*Minimum number of external parts required
SIP-9
BLOCK DIAGRAM
1
2
3
4
6
7
8
9
5
comparator
Amplifier
Reference
Voltage
Vcc
Input
Output
D5
GND
D4
D3
D2
D1
comparator
comparator
comparator
comparator
ABSOLUTE MAXIMUM RATINGS
(Ta=25
°
C
)
Characteristic
Symbol
Value
Unit
Supply Voltage
Vcc
1
6
V
Amplifier input Voltage
V8
-0.5V~Vcc
V
Pin 7 Voltage
V7
6
V
D terminal Output Voltage
V
D
1
6
V
Operating Temperature
Topr
-20 to +80
°
C
Storage Temperature
Tstg
-40 to 125
°
C
Power dissipation
P
D
1100
W
KA2284 LINEAR INTEGRATED CIRCUIT
1
ELECTRICAL CHARACTERISTICS
(Ta=25
°
C,Ta=25
°
C,V
CC
=6V,f=1kHZ, unless otherwise specified)
Characteristic
Symbol
Test Condition
Min
Typ.
Max
Unit
Supply Voltage
V
CC
3.5
6.0
16.0
V
Supply Current
I
CC
V
IN
=0
5
8
mA
Sensitivity
Vin
In V
C3
Level
46
56
66
mV
Comparator ON Level 1
V
C1
-11.5
-10.0
-8.5
dB
Comparator ON Level 2
V
C2
-6
-5
-4
dB
Comparator ON Level 3
V
C3
0
dB
Comparator ON Level 4
V
C4
2.5
3.0
3.5
dB
Comparator ON Level 5
V
C5
5
6
7
dB
LED Output current
I
LED
11.0
15.0
18.5
mA
Amp Gain
Gv
Vi=0.1V
24
26
28
dB
Input Bias Current
I
INO
-1.0
-0.3
µ
A
TEST CIRCUIT
1
2
3
4
6
7
8
9
5
Amplifier
Reference
Voltage
R1
10k
Ω¦
C 1
10
µ
F
VR
10k
Ω¦
2.2
µ
F
Vcc
Input
Comparator
Comparator
Comparator
Comparator
Comparator
R
KA2284 LINEAR INTEGRATED CIRCUIT
2
APPLICATION INFORMATION
1. By changing the time constant C1 and ,the response, attack and release time, may be varied. In the above
application 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.
TO KA2284
R
Vcc= 10~16V; R=100
Ω¦
Vcc= 8~14V; R=68
Ω¦
Vcc=6.5~12V; R=47
Ω¦
Vcc
TYPICAL PERFORMANCE CHARACTERISTICS
-20
0
20
40
60
80
-40
0
1000
1200
600
1400
800
400
200
Ambient Temperature, (
Maximum Power Dissipation vs Ambient
Temperature
Pdmax
(mW)
KA2284 LINEAR INTEGRATED CIRCUIT
3