What models and application scenarios does the LM3914 have?
LM3914 is a widely used linear bar display driver, launched by National Semiconductor Corporation. It takes a voltage input and converts it to a level displayed on the digital tube. The LM3914 was first introduced in 1980 and has since become one of the industry standards. Below, Jinftry will introduce the specific models and application scenarios of LM3914 in detail.
The specific model of LM3914
LM3914 is a high-performance, low-power integrated circuit, it contains 10 output levels, and each output level corresponds to a group of LED lights. The input voltage range of LM3914 is from 0V to 20V, and the maximum output current is 30mA. The IC can achieve 0.5% linearity over the input voltage range and has an independent brightness adjustment function. In addition, LM3914 also supports external reference voltage, you can use an external resistor to adjust the LED brightness.
LM3914 has a variety of models, including LM3914N-1, LM3914N-1/NOPB, LM3914V, LM3914V/NOPB, LM3914VX, LM3914VX-NS and LM3914VX/NOPB, etc. There are some minor differences between these models, which are described below.
The LM3914N-1 is a 14-segment LED level indicator with linear or logarithmic LED output. It can directly drive LEDs or light strips and can adjust the brightness through pins. This model has an operating voltage range of 3V to 25V and an operating temperature range of -40°C to +85°C. LM3914N-1 is often used in audio indication and signal strength indication and other fields.
The LM3914N-1/NOPB has the same features and parameters as the LM3914N-1, but it is a lead-free model and is RoHS compliant. The pin layout of this model is the same as LM3914N-1, but there are some differences from the old version due to the lead-free design.
The LM3914V is an extended temperature level indicator that operates from -40°C to +125°C. This model is the same as LM3914N-1, with linear or logarithmic LED output, the brightness can be adjusted through pins, and it can directly drive the LED or light bar. The LM3914V is often used in high-temperature environments such as automotive, aerospace, and military applications.
The LM3914V/NOPB has the same functions and parameters as the LM3914V, but it is also a lead-free model and is RoHS compliant. The pin layout of this model is the same as LM3914V, but there are some differences from the old version due to the lead-free design.
The LM3914VX is a customized version with the same parameters and functions as the LM3914V but with additional features. This model can adjust the blinking speed and duty cycle of the LED through external resistors and capacitors to produce more visual effects. In addition, it has features such as lower supply current and higher ESD protection.
The LM3914VX-NS is a military-standard version with increased reliability and stability. This model has the same features as the LM3914VX but is also military-tested and certified for use in harsh environments.
The LM3914VX/NOPB has the same functions and parameters as the LM3914VX, but it is also a lead-free model and is RoHS compliant. The pin layout of this model is the same as LM3914VX, but there are some differences from the old version due to the lead-free design.
In addition to the above models, there are some other LM3914 models, such as LM3914L, LM3914L/NOPB, LM3914M, LM3914M/NOPB, etc. The parameters and characteristics of these models may vary and need to be selected on a case-by-case basis.
Application scenarios of LM3914
1. Audio level indicator
The LM3914 is an ideal audio level indicator. It can convert the audio signal into a visual level indicator by connecting the input signal to the pin of LM3914. Audio level indicators can be used in a variety of applications such as audio amplifiers, recording equipment, and sound systems.
2. Battery power indicator
LM3914 can also be used for battery level indicators. By connecting the battery voltage to the pins of the LM3914, the battery level can be converted into an LED bar graph. This is very useful in portable devices such as cell phones, MP3 players, and handheld game consoles.
3. Voltage measurement
LM3914 can also be used for voltage measurement. By connecting the voltage to be measured to the pin of LM3914, the voltage can be converted into a visual level indicator. Voltage measurement can be used in a variety of applications such as battery chargers, power adapters, and automotive electrical systems.
4. Temperature measurement
LM3914 can also be used for temperature measurement. By connecting the voltage output by the temperature sensor to the pin of LM3914, the temperature can be converted into a visual level indication. This is very useful in temperature monitoring and control, for example in areas such as industrial control, automotive, and home appliances.
5. Light intensity measurement
LM3914 can also be used for light intensity measurement. By connecting the output voltage of the photoresistor or photodiode to the pin of LM3914, the light intensity can be converted into a visual level indication. This is useful in lighting and optical measurements, for example in areas such as lamp control, cameras, and photometers.
6. Current measurement
LM3914 can also be used for current measurements. By connecting the voltage of the current measuring resistor to the pin of the LM3914, the current can be converted into a visual level indication. This is very useful in power monitoring and control, for example in areas such as power meters and electronic loads.
In conclusion, the LM3914 has a wide range of application scenarios and can be used for various signal conversion and indication tasks. It is a low-power, high-performance integrated circuit that is easy to use and integrate into various electronic devices. Therefore, the LM3914 is a very useful tool in electronic design and manufacturing.
