LM3914V/NOPB National Semiconductor, LM3914V/NOPB Datasheet
LM3914V/NOPB
Specifications of LM3914V/NOPB
LM3914V
Available stocks
Related parts for LM3914V/NOPB
LM3914V/NOPB Summary of contents
Page 1
... This assures that at no time will all LEDs be “OFF”, and thus any ambiguous display is avoided. Various novel displays are possible. © 2004 National Semiconductor Corporation Much of the display flexibility derives from the fact that all outputs are individual, DC regulated currents. Various effects can be achieved by modulating these currents ...
Page 2
Typical Applications Note: Grounding method is typical of all uses. The 2.2µF 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 00797001 ...
Page 3
... 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 Reference Load Current Electrical Characteristics ...
Page 4
Electrical Characteristics Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC ...
Page 5
Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature LED Current-Regulation Dropout Operating Input Bias Current vs Temperature 00797002 Reference Adjust Pin Current vs Temperature 00797021 LED Driver Saturation 00797023 5 00797020 00797022 Voltage 00797024 www.national.com ...
Page 6
Typical Performance Characteristics Input Current Beyond Signal Range (Pin 5) LED Driver Current Regulation Common-Mode Limits www.national.com (Continued) LED Current vs Reference Loading 00797025 Total Divider Resistance vs Temperature 00797027 Output Characteristics 00797029 6 00797026 00797028 00797030 ...
Page 7
Block Diagram (Showing Simplest Application) 7 00797003 www.national.com ...
Page 8
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 ...
Page 9
Mode Pin Functional Description (Continued) DOT MODE CARRY In order for the display to make sense when multiple LM3914s are cascaded in dot mode, special circuitry has been included to shut off LED No the first device when ...
Page 10
Typical Applications www.national.com Zero-Center Meter, 20-Segment 10 00797007 ...
Page 11
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. Expanded Scale Meter, Dot or Bar of ...
Page 12
Typical Applications 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 Bar ...
Page 13
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. Adding ...
Page 14
Typical Applications Operating with a High Voltage Supply (Dot Mode Only) The LED currents are approximately 10mA, and the LM3914 outputs operate in saturation for minimum dissipation. *This point is partially regulated and decreases in voltage with temperature. Voltage requirements ...
Page 15
Typical Applications (Continued) *The exact wiring arrangement of this schematic shows the need for Mode Select (pin 9) to sense the V Programs LEDs to 10mA Application Hints Three of the most commonly needed precautions for using the LM3914 are ...
Page 16
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 (.230Ω stable, low resistance divider greatly reduces voltage changes due to ...
Page 17
Application Hints (Continued) Non-Interacting Adjustments for Expanded Scale Meter (4.5V to 5V, Bar or Dot Mode) Adjusting Linearity of Several Stacked Dividers Other Applications • “Slow” — fade bar or dot display (doubles resolution) • 20-step meter with single pot ...
Page 18
Connection Diagrams www.national.com Plastic Chip Carrier Package Top View Order Number LM3914V See NS Package Number V20A Dual-in-Line Package Top View Order Number LM3914N-1 See NS Package Number NA18A Order Number LM3914N * See NS Package Number N18A * Discontinued, ...
Page 19
LM3914 MDC MWC Dot/Bar Display Driver Die/Wafer Characteristics Fabrication Attributes Physical Die Identification Die Step Physical Attributes Wafer Diameter Dise Size (Drawn) Thickness Min Pitch Special Assembly Requirements: Note: Actual die size is rounded to the nearest micron. (Referenced to ...
Page 20
Die/Wafer Characteristics LED NO.5 18 LED NO.4 19 LED NO.3 20 LED NO U.S.A Tel #: Fax: IN EUROPE Tel: Fax: IN ASIA PACIFIC Tel: IN JAPAN Tel: www.national.com (Continued) -320 1154 105 -526 1154 105 -1086 1086 ...
Page 21
Physical Dimensions inches (millimeters) unless otherwise noted Note: Unless otherwise specified. 1. Standard Lead Finish: 200 microinches /5.08 micrometer minimum lead/tin 37/63 or 15/85 on alloy 42 or equivalent or copper 2. Reference JEDEC registration MS-001, Variation AC, dated May ...
Page 22
... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...