Details

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BUY LM3914N-1/NOPB https://www.utsource.net/itm/p/12445066.html

Parameter	Symbol	Min	Typ	Max	Unit
Supply Voltage	Vcc	3	5	18	V
Quiescent Current	IQ	-	0.5	2	mA
Output Sink Current	IOL	0	40	60	mA
Input Resistance	Ri	1	2	5	MΩ
Reference Voltage	Vref	1.25	-	1.25	V
Operating Temperature	Temp	-40	25	85	°C

Instructions for LM3914N-1/NOPB

1. Supply Voltage Connection:

   • Connect the supply voltage (Vcc) between pins 3 and 2. Pin 3 is V+ and pin 2 is V-.

2. Reference Voltage Setup:

   • The reference voltage can be set using an external resistor connected to pin 7 (RLO). For a standard setup, leave this pin unconnected for a fixed 1.25V reference.

3. Input Signal:

   • Apply the input signal to pin 5 (IN). This signal will be compared against the internal reference voltages.

4. Mode Selection:

   • Pin 9 (MODE) determines the display mode. Leave it open for bar-graph mode or connect it to ground for dot mode.

5. Output Configuration:

   • Outputs are active low and can sink up to 60mA each. Connect LEDs or other indicators to the output pins (pins 1 through 10).

6. Thermal Considerations:

   • Ensure adequate heat dissipation if operating at higher currents or temperatures.

7. Protection:

   • Include transient protection diodes if the device is exposed to voltage spikes.

8. Capacitor Connections:

   • A bypass capacitor (e.g., 0.1μF) should be placed between Vcc and ground close to the IC for stability.

For detailed design considerations and advanced configurations, refer to the full datasheet available from the manufacturer.

(For reference only)