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LM3915 Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3915
Description  Dot/Bar Display Driver
Download  25 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3915 Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation (Note 6)
Molded DIP(N)
1365 mW
Supply Voltage
25V
Voltage on Output Drivers
25V
Input Signal Overvoltage (Note 4)
±35V
Divider Voltage
−100 mV to V
+
Reference Load Current
10 mA
Storage Temperature Range
−55˚C to +150˚C
Lead Temperature
(Soldering, 10 sec.)
260˚C
Electrical Characteristics (Notes 2, 4)
Parameter
Conditions (Note 2)
Min
Typ
Max
Units
COMPARATOR
Offset Voltage, Buffer and First
Comparator
0V
≤ V
RLO =VRHI
≤ 12V,
I
LED =1mA
310
mV
Offset Voltage, Buffer and Any Other
Comparator
0V
≤ V
RLO =VRHI
≤ 12V,
I
LED =1mA
315
mV
Gain (
∆I
LED/
∆V
IN)IL(REF) = 2 mA, ILED = 10 mA
3
8
mA/mV
Input Bias Current (at Pin 5)
0V
≤ V
IN
≤ (V+ − 1.5V)
25
100
nA
Input Signal Overvoltage
No Change in Display
−35
35
V
VOLTAGE-DIVIDER
Divider Resistance
Total, Pin 6 to 4
16
28
36
k
Relative Accuracy (Input Change Between
Any Two Threshold Points)
(Note 3)
2.0
3.0
4.0
dB
Absolute Accuracy at Each Threshold
Point
(Note 3)
V
IN = −3, −6 dB
−0.5
+0.5
dB
V
IN = −9 dB
−0.5
+0.65
dB
V
IN = −12, −15, −18 dB
−0.5
+1.0
dB
V
IH = −21, −24, −27 dB
−0.5
+1.5
dB
VOLTAGE REFERENCE
Output Voltage
0.1 mA
≤ I
L(REF)
≤ 4 mA,
V
+ =V
LED =5V
1.2
1.28
1.34
V
Line Regulation
3V
≤ V+ ≤ 18V
0.01
0.03
%/V
Load Regulation
0.1 mA
≤ I
L(REF)
≤ 4 mA,
V
+ =V
LED =5V
0.4
2
%
Output Voltage Change with
Temperature
0˚C
≤ T
A
≤ +70˚C, I
L(REF) = 1 mA,
V
+ =V
LED =5V
1%
Adjust Pin Current
75
120
µA
OUTPUT DRIVERS
LED Current
V
+ =V
LED = 5V, IL(REF) = 1 mA
7
10
13
mA
LED Current Difference (Between
Largest and Smallest LED Currents)
V
LED = 5V, ILED =2mA
V
LED = 5V, ILED 20 mA
0.12
0.4
mA
1.2
3
LED Current Regulation
2V
≤ V
LED
≤ 17V, I
LED =2mA
I
LED =20mA
0.1
0.25
mA
13
Dropout Voltage
I
LED(ON) =20mA, @ VLED = 5V,
∆I
LED =2mA
1.5
V
Saturation Voltage
I
LED = 2.0 mA, IL(REF) = 0.4 mA
0.15
0.4
V
Output Leakage, Each Collector
(Bar Mode) (Note 5)
0.1
10
µA
Output Leakage
Pins 10–18
(Dot Mode) (Note 5)
0.1
10
µA
Pin 1
60
150
450
µA
www.national.com
3


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