LM3916

Manufacturer Part NumberLM3916
ManufacturerTexas Instruments
LM3916 datasheet
 


Specifications of LM3916

Output Channels10Led Voltage(max)(v)17
Pin/package18PDIPRegulated Outputs(#)10
Iout(max)(a)0.03Led ConfigurationParallel
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LM3916
LM3916 Dot/Bar Display Driver
Literature Number: SNVS762A

LM3916 Summary of contents

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    ... LM3916 LM3916 Dot/Bar Display Driver Literature Number: SNVS762A ...

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    ... Outputs are current regulated, open collectors n Directly drives TTL or CMOS n The internal 10-step divider is floating and can be referenced to a wide range of voltages The LM3916 is rated for operation from 0˚C to +70˚C. The LM3916N-1 is available in an 18-lead molded DIP package. DS007971 January 2000 ± ...

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    Typical Applications Notes: Capacitor C1 is required if leads to the LED supply are 6" or longer. Circuit as shown is wired for dot mode. For bar mode, connect pin 9 to pin 3. V dissipation. www.national.com 0V to 10V ...

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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 Electrical Characteristics Parameter COMPARATORS Offset Voltage, ...

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    ... Note 5: Bar mode results when pin 9 is within disabled if pin 9 is pulled 0.9V or more below V Note 6: The maximum junction temperature of the LM3916 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). ...

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    Typical Performance Characteristics Supply Current vs Temperature Reference Voltage vs Temperature LED Current-Regulation Dropout 00797135 00797137 00797139 5 Operating Input Bias Current vs Temperature 00797136 Reference Adjust Pin Current vs Temperature 00797138 LED Driver Saturation Voltage 00797140 www.national.com ...

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    Typical Performance Characteristics Input Current Beyond Signal Range (Pin 5) LED Driver Current Regulation Common-Mode Limits www.national.com (Continued) 00797141 Total Divider Resistance 00797143 Output Characteristics 00797145 6 LED Current vs Referenced Loading 00797142 vs Temperature 00797144 00797146 ...

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    Block Diagram (Showing Simplest Application) 7 00797104 www.national.com ...

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    ... LM3916 driver. Continue connecting pin 9 of lower input drivers to pin 1 of higher input drivers for 30 or more LED displays. The last LM3916 driver in the chain will have pin 9 left open. All previous drivers should have a 20k resistor in parallel with LED #9 (pin ...

  • Page 10

    Mode Pin Functional Description This pin actually performs two functions. Refer to the simpli- fied block diagram below. Block Diagram of Mode Pin Function *High for bar DOT OR BAR MODE SELECTION The voltage at pin 9 is sensed by ...

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    ... Figure 3 uses a PNP emitter-follower in front of the diode. Now, the transistor’s base-emitter voltage cancels out the diode offset, within about 100 mV. This approach is usually satisfactory when a single LM3916 is used for display. Display circuits such as the extended range VU meter using two or more drivers for a dynamic range greater require more accurate detection ...

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    ... R5 • C2. A simple modification results in the precision full-wave detector of Figure 6. Since the filter capacitor is not buffered, this circuit can drive only high impedance loads such as the input of an LM3916. 00797110 D1, D2: 1N914 or 1N4148 FIGURE 5. Precision Full-Wave Average Detector ...

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    ... LM3916 are cascaded, the −20 dB output from the LM3916 is dropped. The full-scale display for the LM3915 is set below the LM3916’s −10 dB output and the rest of the thresholds continue the 3 dB/step spacing. A simple, low cost approach is to set the reference voltage of the two chips 16 dB apart as in Figure 5 ...

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    ... LM3915. Alternatively, instead of amplifying, input signals of sufficient amplitude can be fed directly to the LM3916 and attenuated drive the LM3915. FIGURE 8. Low Cost Circuit for 40 dB Display FIGURE 9 ...

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    Application Hints (Continued) To extend this approach to get display, another amplification must be placed in the signal path ahead of the lowest LM3915. Extreme care is required as the lowest LM3915 displays input ...

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    Application Hints (Continued ≤ I ≤ LED REF FIGURE 12. Independent Adjustment of Reference Voltage and LED Intensity for Multiple Drivers 1.25V ≤ V ≤ 10V REF 1.5 mA ≤ I ≤ 25 ...

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    Other Applications (Continued) FIGURE 14 10V VU Meter with Smooth Transitions www.national.com 00797121 16 ...

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    17 www.national.com ...

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    www.national.com 18 ...

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    Typical Applications (Continued) ± R7 thru R15: 10k 10% D1, D2: 1N914 or 1N4148 *Half-wave peak detector. See Application Hints. Driving Vacuum Fluorescent Display 19 00797124 www.national.com ...

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    Typical Applications Indicator and Alarm, Full-Scale Changes Display From Dot to Bar *The input to the Dot-Bar switch may be taken from cathodes of other LEDs. Display will change to bar as soon as the LED so selected begins to ...

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    21 www.national.com ...

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    www.national.com 22 ...

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    Typical Applications (Continued) Displaying Additional Levels 23 00797128 www.national.com ...

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    ... Operating with a High Voltage Supply (Dot Mode Only) The LED currents are approximately 10 mA, and LM3916 outputs operate in saturation for minimum dissipation. *This point is partially regulated and decreases in voltage with temperature. Voltage requirements of the LM3916 also decrease with temperature. Supply current drain is only 20 mA with ten LEDs illuminated www ...

  • Page 26

    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. Driving ...

  • Page 27

    ... Dual-In-Line Package Top View Order Number LM3916N-1 See NS Package Number NA18A Order Number LM3916N * See NS Package Number N18A *Discontinued, Life Time Buy date 12/20/99 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 ...

  • Page 28

    ... 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 1993. Molded Dual-In-Line Package (N) Order Number LM3916N-1 NS Package Number NA18A 27 www.national.com ...

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    ... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Molded Dual-In-Line Package (N) Order Number LM3916N * NS Package Number N18A *Discontinued, Life Time Buy date 12/20/ critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

  • Page 30

    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...