Datasheet

LM3914
www.ti.com SNVS761B –JANUARY 2000–REVISED MARCH 2013
DEFINITION OF TERMS
Accuracy: The difference between the observed threshold voltage and the ideal threshold voltage for each
comparator. Specified and tested with 10V across the internal voltage divider so that resistor ratio
matching error predominates 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 (I
LED
) to the change in input voltage (V
IN
) required
to produce 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 measured 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 over the specified range of supply voltage
(V
+
).
Load Regulation: The change in reference output voltage (V
REF
) 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 (V
RLO
).
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