LM3915MWC National Semiconductor Corporation, LM3915MWC Datasheet - Page 4

• Manufacturer Part Number: LM3915MWC
• Description: Dot/bar Display Driver
• Manufacturer: National Semiconductor Corporation

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Electrical Characteristics
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 2: Unless otherwise stated, all specifications apply with the following conditions:
3 V
3 V
−0.015V
Note 3: Accuracy is measured referred to 0 dB = + 10.000 V
comparator offset voltage may add significant error. See table for threshold voltages.
Note 4: Pin 5 input current must be limited to
Note 5: Bar mode results when pin 9 is within 20 mV of V
disabled if pin 9 is pulled 0.9V or more below V
Note 6: The maximum junction temperature of the LM3915 is 100˚C. Devices must be derated for operation at elevated temperatures. Junction to ambient thermal
resistance is 55˚C/W for the molded DIP (N package).
Threshold Voltage
Typical Performance Characteristics
Supply Current vs Temperature
Reference Adjust Pin
Current vs Temperature
Output
DC
DC
1
2
3
4
5
V
V
+
LED
V
RHI
20 V
V
+
12 V
DC
−27
−24
−21
−18
−15
dB
DC
V
REF
−0.015V
, V
0V
0.422
0.596
0.841
1.189
1.679
RHI
Min
DS005104-34
DS005104-37
, V
V
V
IN
RLO
(Note 3)
RLO
V
+
(V
±
12 V
− 1.5V
LED
3 mA. The addition of a 39k resistor in series with pin 5 allows
+
− 1.5V)
0.447
0.631
0.891
1.259
1.778
.
Typ
DC
(Notes 2, 4) (Continued)
Operating Input Bias Current vs
Temperature
LED Current-Regulation
Dropout
+
. Dot mode results when pin 9 is pulled at least 200 mV below V
DC
T
A
at pin 5, with + 10.000 V
For higher power dissipations, pulse testing is used.
= 25˚C, I
0.531
0.750
1.059
1.413
1.995
Max
L(REF)
4
= 0.2 mA, pin 9 connected to pin 3 (bar mode).
Output
10
DC
6
7
8
9
at pin 6, and 0.000 V
DS005104-35
DS005104-38
−12
dB
−9
−6
−3
0
DC
±
Reference Voltage vs
Temperature
LED Driver Saturation
Voltage
100V signals without damage.
at pin 4. At lower full scale voltages, buffer and
2.372
3.350
4.732
6.683
9.985
Min
+
. LED # 10 (pin 10 output current) is
2.512
3.548
5.012
7.079
Typ
10
DS005104-39
10.015
DS005104-36
2.819
3.825
5.309
7.498
Max