LM2917N/NOPB

Product Overview

Category: Integrated Circuit (IC)

Use: Frequency to Voltage Converter

Characteristics: - Converts frequency signals into proportional voltage outputs - Wide operating frequency range - High linearity and accuracy - Low power consumption - Suitable for automotive applications

Package: PDIP (Plastic Dual In-Line Package)

Essence: The LM2917N/NOPB is a frequency to voltage converter IC that allows the conversion of frequency signals into proportional voltage outputs. It is commonly used in various applications, particularly in the automotive industry.

Packaging/Quantity: The LM2917N/NOPB is available in a PDIP package and is typically sold in reels or tubes containing multiple units.

Specifications

The LM2917N/NOPB has the following specifications:

• Supply Voltage Range: 4V to 18V
• Operating Temperature Range: -40°C to +85°C
• Frequency Input Range: 0Hz to 10kHz
• Voltage Output Range: 0V to VCC
• Linearity Error: ±0.2% (typical)
• Quiescent Current: 6mA (typical)

Pin Configuration

The LM2917N/NOPB has eight pins arranged as follows:

___________ | | VCC|1 8|GND VIN|2 7|OUT REF|3 6|NC RC|4 5|RC |___________|

1. VCC: Power supply pin (+)
2. VIN: Frequency input pin
3. REF: Reference voltage input pin
4. RC: Timing capacitor pin
5. RC: Timing resistor pin
6. NC: No connection
7. OUT: Voltage output pin
8. GND: Ground pin (-)

Functional Features

• Converts frequency signals into proportional voltage outputs
• Wide operating frequency range allows for versatile applications
• High linearity and accuracy ensure precise voltage conversion
• Low power consumption makes it suitable for battery-powered systems
• Designed specifically for automotive applications, such as tachometers and speedometers

Advantages and Disadvantages

Advantages: - Accurate frequency to voltage conversion - Wide operating frequency range - Low power consumption - Suitable for automotive applications

Disadvantages: - Limited voltage output range (0V to VCC) - Requires external timing components (resistor and capacitor)

Working Principles

The LM2917N/NOPB operates on the principle of converting frequency signals into proportional voltage outputs. It uses an internal voltage-controlled oscillator (VCO) to generate a square wave whose frequency is directly proportional to the input frequency. This square wave is then passed through a low-pass filter to obtain a DC voltage proportional to the input frequency. The output voltage is linearly related to the input frequency within the specified range.

Detailed Application Field Plans

The LM2917N/NOPB is widely used in various applications, especially in the automotive industry. Some common application field plans include:

1. Tachometers: The LM2917N/NOPB can be used to convert the rotational speed of an engine or motor into a proportional voltage output, which can then be displayed on a tachometer.

2. Speedometers: By converting the frequency of a vehicle's wheel rotation into a voltage signal, the LM2917N/NOPB enables accurate speed measurement for speedometers.

3. Frequency-based control systems: The IC can be utilized in systems that require frequency-to-voltage conversion for control purposes, such as feedback loops or closed-loop control systems.

4. RPM measurement: The LM2917N/NOPB can be employed to measure the revolutions per minute (RPM) of rotating machinery, allowing for precise monitoring and control.

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the LM2917N/NOPB include:

1. LM2907: This IC is a frequency-to-voltage converter with similar specifications and pin configuration as the LM2917N/NOPB.

2. XR-4151: Another frequency-to-voltage converter IC suitable for automotive applications, offering comparable features and performance.

3. ICL8038: While primarily a function generator IC, it can also be used as a frequency-to-voltage converter in certain applications.

4. CA3140: Although not specifically designed for frequency-to-voltage conversion, this operational amplifier IC can be used in conjunction with external components to achieve similar functionality.

In conclusion, the LM2917N/NOPB is an integrated circuit that converts frequency signals into proportional voltage outputs. With its wide operating frequency range, high linearity, and low power consumption, it finds extensive use in automotive applications such as tachometers, speed