LM3915 datasheet(23/25 Pages) NSC

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Connection Diagram

Dual-in-Line Package

00510432

Top View

Order Number LM3915N-1

See NS Package Number NA18A

Order Number LM3915N *

See NS Package Number N18A

*Discontinued, Life Time Buy date 12/20/99

Definition of Terms

Absolute Accuracy: The difference between the observed

threshold voltage and the ideal threshold voltage for each

comparator. Specified and tested with 10V across the inter-

nal voltage divider so that resistor ratio matching error pre-

dominates over comparator offset voltage.

Adjust Pin Current: Current flowing out of the reference

adjust pin when the reference amplifier is in the linear region.

Comparator Gain: The ratio of the change in output current

LED) to the change in input voltage (VIN) required to pro-

duce it for a comparator in the linear region.

Dropout Voltage: The voltage measured at the current

source outputs required to make the output current fall by

10%.

Input Bias Current: Current flowing out of the signal input

when the input buffer is in the linear region.

LED Current Regulation: The change in output current over

the specified range of LED supply voltage (V

LED) as mea-

sured at the current source outputs. As the forward voltage

of an LED does not change significantly with a small change

in forward current, this is equivalent to changing the voltage

at the LED anodes by the same amount.

Line Regulation: The average change in reference output

voltage (V

REF) over the specified range of supply voltage

+).

Load Regulation: The change in reference output voltage

over the specified range of load current (I

L(REF)).

Offset Voltage: The differential input voltage which must be

applied to each comparator to bias the output in the linear

region. Most significant error when the voltage across the

internal voltage divider is small. Specified and tested with pin

6 voltage (V

RHI) equal to pin 4 voltage (VRLO).

Relative Accuracy: The difference between any two adja-

cent threshold points. Specified and tested with 10V across

the internal voltage divider so that resistor ratio matching

error predominates over comparator offset voltage.

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