LM3915N datasheet(13/25 Pages) NSC

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LM3915N Datasheet(PDF) 13 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.

Part #	LM3915N

Description	Dot/Bar Display Driver

Download	25 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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13 / 25 page

Application Hints (Continued)

the LED current will be at least 5 mA. R1 will typically be

between 1 k

Ω and2kΩ. To trim the reference voltage, vary

R2.

The circuit in Figure 8 shows how to add a LED intensity

control which can vary LED current from 9 mA to 28 mA. The

reference adjustment has some effect on LED intensity but

the reverse is not true.

Multiple LM3915s

Figure 9 shows how to obtain a common reference trim and

intensity control for two LM3915s. The two ICs may be

connected in cascade for a 60 dB display or may be handling

separate channels for stereo. This technique can be ex-

tended for larger numbers of LM3915s by varying the values

of R1, R2 and R3 in inverse proportion to the number of

devices tied in. The ICs’ internal references track within

100 mV so that worst case error from chip to chip is only

0.1 dB for V

REF = 10V.

00510415

FIGURE 7. Design Equations for Fixed LED Intensity

www.national.com

Manufacturer	Part #	Datasheet	Description
Texas Instruments	LM3915N-1	1Mb / 31P	[Old version datasheet] LM3915 Dot/Bar Display Driver
	LM3915N-1	1Mb / 31P	[Old version datasheet] LM3915 Dot/Bar Display Driver
	LM3915N-1/NOPB	1Mb / 31P	[Old version datasheet] LM3915 Dot/Bar Display Driver

Manufacturer	Part #	Datasheet	Description
National Semiconductor ...	LM3916	509Kb / 27P	Dot/Bar Display Driver
	LM3914	365Kb / 19P	Dot/Bar Display Driver
	LM3914	809Kb / 22P	Dot/Bar Display Driver
Texas Instruments	LM3914N-1	790Kb / 29P	[Old version datasheet] LM3914 Dot/Bar Display Driver
	LM3915N-1	1Mb / 31P	[Old version datasheet] LM3915 Dot/Bar Display Driver
	LM3916	1Mb / 32P	[Old version datasheet] LM3916 Dot/Bar Display Driver
	LM3915N-1	1Mb / 31P	[Old version datasheet] LM3915 Dot/Bar Display Driver
NTE Electronics	NTE1549	29Kb / 4P	Integrated Circuit Dot/Bar Display Driver
	NTE1508	31Kb / 3P	Integrated Circuit 10-Step Dot/Bar Display Driver for Linear Scale
	NTE1509	30Kb / 4P	Integrated Circuit 10-Step Dot/Bar Display Driver for Logarithmic Scale

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