LM3914 datasheet(4/19 Pages) NSC

4 / 19 page

Electrical Characteristics (Notes 2, 4) (Continued)

Note 2: Unless otherwise stated, all specifications apply with the following conditions:

3VDC ≤ V

≤ 20 VDC

VREF,VRHI,VRLO ≤ (V

+ − 1.5V)

3VDC ≤ VLED ≤ V

≤ VIN ≤ V+ − 1.5V

−0.015V

≤ VRLO ≤ 12 VDC

TA = +25˚C, IL(REF) = 0.2 mA, VLED = 3.0V, pin 9 connected to pin 3 (Bar Mode).

−0.015V

≤ VRHI ≤ 12 VDC

For higher power dissipations, pulse testing is used.

Note 3: Accuracy is measured referred to +10.000 VDC at pin 6, with 0.000 VDC at pin 4. At lower full-scale voltages, buffer and comparator offset voltage may add

significant error.

Note 4: Pin 5 input current must be limited to ±3 mA. The addition of a 39k resistor in series with pin 5 allows ±100V signals without damage.

Note 5: Bar mode results when pin 9 is within 20 mV of V+. Dot mode results when pin 9 is pulled at least 200 mV below V+ or left open circuit. LED No. 10 (pin

10 output current) is disabled if pin 9 is pulled 0.9V or more below VLED.

Note 6: The maximum junction temperature of the LM3914 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).

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 di-

vider so that resistor ratio matching error predominates over

comparator offset voltage.

Adjust Pin Current: Current flowing out of the reference ad-

just 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

measured at the current source outputs. As the forward volt-

age 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

REF) over the specified range of load current (IL(REF)).

Offset Voltage: The differential input voltage which must be

applied to each comparator to bias the output in the linear re-

gion. Most significant error when the voltage across the in-

ternal voltage divider is small. Specified and tested with pin

6 voltage (V

RHI) equal to pin 4 voltage (VRLO).

Typical Performance Characteristics

Supply Current vs

Temperature

DS007970-2

Operating Input Bias

Current vs Temperature

DS007970-20

Reference Voltage vs

Temperature

DS007970-21

LM3914 Datasheet(PDF) 4 Page - National Semiconductor (TI)

LM3914 Datasheet(HTML) 4 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19

Datasheet Download

Link URL