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Description
Dot/Bar Display Driver
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The parameters and performance indicators of this product are sourced from the internet. In case of discrepancies, please refer to the manufacturer's technical specifications!！
FEATURES
● 3 dB/step,30 dB Range
● Drives LEDs, LCDs, or Vacuum Fluorescents
● Bar or Dot Display Mode Externally Selectable by User
● Expandable to Displays of 90 dB
● Internal Voltage Reference from 1.2V to 12V
● Operates with Single supply of 3V to 25V
● Inputs Operate Down to Ground
● Output Current Programmable from 1mA to 30mA
● Input Withstands +35v without Damage or False Outputs
● outputs are current Regulated, Open Collectors
● Directly Drives TTL or CMOS
● The Internal 10-step Divider is Floating and can be Referenced to a Wide Range of Voltages
The LM3915 is Rated for Operation from 0℃ to +70℃. The LM3915N-1 is Available in an 18-lead PDIP Package.
DESCRIPTION
The LM3915 is a monolithic integrated circuit that senses analog voltage levels and drives ten LEDs, LCDs or vacuum fluorescent displays,providing a logarithmic 3dB/step analog display. One pin changes the display from a bar graph to a moving dot display. LED current drive is regulated and programmable,eliminating the need for current limiting resistors. The whole display system can operate from a single supply as low as 3v or as high as 25V.
The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. The high-impedance input buffer accepts signals down to ground and up to within 1.5V of the positive supply. Further, it needs no protection against inputs of +35V. The input buffer drives 10 individual comparators referenced to the precision divider. Accuracy is typically better than 1dB.
The LlM3915's 3 dB/step display is suited for signals with wide dynamic range, such as audio level, power, light intensity or vibration. Audio applications include average or peak level indicators, power meters and RF signal strength meters. Replacing conventional meters with an LED bar graph results in a faster responding,more rugged display with high visibility that retains the ease of interpretation of an analog display.
The LM3915 is extremely easy to apply.A 1.2V full-scale meter requires only one resistor in addition to the ten LEDs. One more resistor programs the full-scale anywhere from 1.2V to 12v independent of supply voltage. LED brightness is easily controlled with a single pot.
The LM3915 is very versatile.The outputs can drive LCDs,vacuum fluorescents and incandescent bulbs as well as LEDs of any color. Multiple devices can be cascaded for a dot or bar mode display with a range of 60 or 90 dB.LM3915s can also be cascaded withLM3914s for a linear/log display or with LM3916s for an extended-range VU meter.
| QUANTITY | UNIT PRICE | PLUS UNIT PRICE | TOTAL PRICE |
|---|---|---|---|
| ≥1: | US $2.65980 | US $2.39382 | US $2.39382 |
| ≥5: | US $1.77320 | US $1.59588 | US $7.97940 |
| ≥10: | US $1.59588 | US $1.43629 | US $14.36290 |
| ≥20: | US $1.55155 | US $1.39640 | US $27.92800 |
| ≥50: | US $1.50722 | US $1.35650 | US $67.82500 |
| ≥100: | US $1.46289 | US $1.31660 | US $131.66000 |
| ≥200: | US $1.41856 | US $1.27670 | US $255.34000 |
| ≥500: | US $1.40083 | US $1.26075 | US $630.37500 |
| ≥1000: | US $1.37423 | US $1.23681 | US $1236.81000 |
Substitute (equivalent) Product
| Substitute Product Name | Brief Description |
|---|---|
| LM3916N-1 | Similar to LM3915, but designed to drive LEDs with logarithmic scale for visualizing audio levels |
| LM3914N-1 | Linear display driver for visual representation, differs from LM3915's logarithmic scale |
| ICL7107CPL | Digital display driver for LED numerical displays, commonly used in voltmeters |
| LM3915M | Surface-mount version of the LM3915, offers the same logarithmic display functionality |
| LM324N | Quad operational amplifier, can be configured for various display driver applications, though requires more external components compared to the LM3915 |
Note: The above substitutes may have different specifications and functionalities; it is important to check datasheets and ensure compatibility with your specific application.
Product Usage
The LM3915N-1 is a popular integrated circuit used primarily for driving LED bar or dot displays. It can be configured to operate in either a bar graph mode (where all LEDs up to the current level are lit) or a moving dot display mode (where only one LED at the current level is lit). Here are some common applications and circuits where the LM3915N-1 is used:
Audio Level Meters:
Battery Level Indicators:
Signal Strength Indicators:
Educational and Hobby Projects:
Environmental Monitoring:
Industrial Control Panels:
Automotive Applications:
Here’s a basic example of how you might use the LM3915N-1 to create an audio level meter:
Power Supply:
LED Connections:
Input Signal:
Mode Selection:
This is a simple example, but the LM3915N-1 can be used in more complex circuits with additional features and functionalities.
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All UTSOURCE purchases have a 90 days money back return policy, plus a 100 days UTSOURCE warranty against any manufacturing defects.This warranty shall not apply to any item where defects have been caused by improper customer assembly, failure by customer to follow instructions, product modification, negligent or improper operation.
LM3915N-1
LM3915N-1 has several brands around the world that may have alternate names for LM3915N-1 due to regional differences or acquisition. LM3915N-1 may also be known as the following names:
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