LM3914N-1 National Semiconductor, LM3914N-1 Datasheet
LM3914N-1
Specifications of LM3914N-1
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LM3914N-1 Summary of contents
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... The LM3914 can also act as a program- mer, or sequencer. The LM3914 is rated for operation from 0˚C to +70˚C. The LM3914N-1 is available in an 18-lead molded (N) package. The following typical application illustrates adjusting of the reference to a desired value, and proper grounding for accu- − ...
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Typical Applications Note: Grounding method is typical of all uses. The 2.2 µF tantalum or 10 µF aluminum electrolytic capacitor is needed if leads to the LED supply are 6" or longer. www.national.com Bar Graph Meter 2 ...
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... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation (Note 6) Molded DIP (N) Supply Voltage Voltage on Output Drivers Input Signal Overvoltage (Note 4) Divider Voltage Electrical Characteristics Parameter COMPARATOR Offset Voltage, Buffer and First ...
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Electrical Characteristics Note 2: Unless otherwise stated, all specifications apply with the following conditions REF RHI RLO + + − ...
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Typical Performance Characteristics Reference Adjust Pin Current vs Temperature DS007970-22 Input Current Beyond Signal Range (Pin 5) DS007970-25 Total Divider Resistance vs Temperature DS007970-28 (Continued) LED Current-Regulation Dropout DS007970-23 LED Current vs Reference Loading DS007970-26 Common-Mode Limits DS007970-29 5 LED ...
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Block Diagram (Showing Simplest Application) www.national.com 6 DS007970-3 ...
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Functional Description The simplifed LM3914 block diagram is to give the general idea of the circuit’s operation. A high input impedance buffer operates with signals from ground to 12V, and is protected against reverse and overvoltage signals. The signal is ...
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Mode Pin Functional Description (Continued) LED No the second device comes on. The connection for cascading in dot mode has already been described and is depicted below. As long as the input signal voltage is below the threshold ...
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Typical Applications Zero-Center Meter, 20-Segment 9 DS007970-7 www.national.com ...
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Typical Applications (Continued) * This application illustrates that the LED supply needs practically no filtering Calibration: With a precision meter between pins 4 and 6 adjust R1 for voltage V The adjustments are non-interacting. Application Example: Grading 5V Regulators Highest ...
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Typical Applications (Continued) LEDs light up as illustrated with the upper lit LED indicating the actual input voltage. The display appears to increase resolution and provides an analog indication of overrange. Indicator and Alarm, Full-Scale Changes Display from Dot to ...
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Typical Applications (Continued) Full-scale causes the full bar display to flash. If the junction of R1 and C1 is connected to a different LED cathode, the display will flash when that LED lights, and at any higher input signal. Hysteresis ...
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Typical Applications (Continued) Operating with a High Voltage Supply (Dot Mode Only) The LED currents are approximately 10 mA, and the LM3914 outputs operate in saturation for minimum dissipation. * This point is partially regulated and decreases in voltage with ...
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Typical Applications (Continued) * The exact wiring arrangement of this schematic shows the need for Mode Select (pin 9) to sense the V Programs LEDs Application Hints Three of the most commonly needed precautions for using the ...
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Application Hints (Continued) APPLICATION TIPS FOR THE LM3914 ADJUSTABLE REFERENCE GREATLY EXPANDED SCALE (BAR MODE ONLY) Placing the LM3914 internal resistor divider in parallel with a section ( 230 ) of a stable, low resistance divider greatly reduces voltage changes ...
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Application Hints (Continued) Non-Interacting Adjustments for Expanded Scale Meter (4.5V to 5V, Bar or Dot Mode) Adjusting Linearity of Several Stacked Dividers www.national.com Other Applications • “Slow” — fade bar or dot display (doubles resolution) • 20-step meter with single ...
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... Connection Diagrams Plastic Chip Carrier Package Top View Order Number LM3914V See NS Package Number V20A DS007970-18 Order Number LM3914N-1 See NS Package Number NA18A Order Number LM3914N See NS Package Number N18A * Discontinued, Life Time Buy date 12/20/99 17 Dual-in-Line Package DS007970-19 Top View * www ...
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... Reference JEDEC registration MS-001, Variation AC, dated May 1993. www.national.com inches (millimeters) unless otherwise noted Dual-In-Line Package (N) Order Number LM3914N-1 NS Package Number NA18A Plastic Chip Carrier Package (V) Order Number LM3914V NS Package Number V20A 18 ...
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... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) Dual-In-Line Package (N) Order Number LM3914N NS Package Number N18A * Discontinued, Life Time Buy date 12/20/99 2 ...