NTE1500 & NTE1501
Integrated Circuit
7Step LED Driver Circuit
Description:
The NTE1500 and NTE1501 are integrated circuits designed for driving 7dot LED displays. The
NTE1500 responds logarithmically to the input signal while the NTE1501 responds linearly. Because
an adjustment pin for output current is provided, the brightness of the LED can be controlled.
Features:
D
Linear (NTE1501) and Logarithmic (NTE1500) Response
D
7LED Bar Graph Display Driver
D
Brightness is Externally Adjustable
D
High Output Current: 25mA Max
D
Series Connection Capable for Driving more than 7Dot Displays
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Supply Voltage, V
CC
18V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Circuit Voltage, V
I
7.5V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage, V
I
16V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage, V
O
16V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Current, I
CC
25mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Current, I
O
25mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
D
1800mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Ambient Temperature Range, T
opr
30
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
55
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= +25
C, V
CC
= 9V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Current
I
tot
V
2
= 0
4
18
mA
Output Inflow Current
I
(SINK)915
V
I
= 3.55V, V
7
= 3.5V
13
25
mA
Reference Voltage
V
REF
3.55
3.75
3.95
V
Output Offset Voltage (Amp)
V
O(offset)
V
CC
= 16V, G
V
= 20dB, V
2
= 0
150
+150
mV
Voltage Gain (Amp)
G
V
V
2
= 50mV
18
20
22
dB
Output Pin Leakage Current
I
O(Leak)
V
CC
= 18V
0
20
A
Electrical Characteristics (Cont'd): (T
A
= +25
C, V
CC
= 9V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Input Bias Current (Amp)
I
Bias2
V
CC
= 18V, V
2
= 0
2
0
A
I
Bias3
V
CC
= 18V, V
3
= 0
2
0
A
Input Bias Current (Comparator)
I
Bias7
V
CC
= 18V, V
2
= 10V, V
3
= 0, V
7
= 0
10
0
A
I
Bias1
V
CC
= 18V, V
3
= 10V, V
I
= 0, V
2
= 0,
V
6
= V
7
10
0
A
Comparator Level (NTE1500)
GD
1
*
V
7
= 3.5, V
8
= 0
17
15
13
dB
GD
2
9
7
5
dB
GD
3
4
3
2
dB
GD
4
1
0
1
dB
GD
5
1.5
2.0
2.5
dB
GD
6
3.5
4.0
4.5
dB
GD
7
4.5
5.0
5.5
dB
Comparator Level (NTE1501)
GD
1
V
7
= 3.65, V
8
= 0
0.4
0.5
0.6
dB
GD
2
0.85
1.0
1.15
dB
GD
3
1.35
1.5
1.65
dB
GD
4
1.85
2.0
2.15
dB
GD
5
2.35
2.5
2.65
dB
GD
6
2.85
3.0
3.15
dB
GD
7
3.35
3.5
3.65
dB
* The comparator reference voltage is 3.5V and 2.0V is 0dB (V
CC
opr = 5V to 16V).
V
CC
V
ref
LED5
LED1
LED2
LED3
LED4
LED6
LED7
R1
R2
LED Current Input
Input (+)
Input ()
Output
LED Current Input
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
17
Pin Connection Diagram
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