LF398N/NOPB

Product Overview

• Category: Integrated Circuit
• Use: Voltage-to-Frequency Converter
• Characteristics: High linearity, low power consumption
• Package: PDIP-8, SOIC-8
• Essence: Monolithic voltage-to-frequency converter
• Packaging/Quantity: Available in tubes or reels, quantity varies based on supplier

Specifications

• Supply Voltage: 4.5V to 20V
• Frequency Linearity: ±0.01% (typical)
• Operating Temperature Range: -40°C to +85°C
• Frequency Range: DC to 500kHz
• Power Consumption: 1.2mA (typical)

Detailed Pin Configuration

The LF398N/NOPB has a total of 8 pins:

1. VFC Input: Voltage-to-frequency conversion input
2. Ground: Reference ground for the IC
3. Frequency Output: Frequency output proportional to the input voltage
4. Control Voltage Input: Adjusts the frequency range
5. Timing Capacitor: Connects an external timing capacitor for frequency control
6. Timing Resistor: Connects an external timing resistor for frequency control
7. Positive Supply Voltage: Power supply input
8. Negative Supply Voltage: Power supply input (ground reference)

Functional Features

• High linearity and accuracy in voltage-to-frequency conversion
• Low power consumption makes it suitable for battery-powered applications
• Wide operating temperature range allows for use in various environments
• Adjustable frequency range using the control voltage input
• External timing capacitor and resistor provide flexibility in frequency control

Advantages

• Excellent linearity ensures accurate voltage-to-frequency conversion
• Low power consumption extends battery life in portable devices
• Wide operating temperature range enables reliable performance in extreme conditions
• Adjustable frequency range allows customization for specific applications
• External timing components offer flexibility in frequency control

Disadvantages

• Limited frequency range up to 500kHz, not suitable for high-frequency applications
• Requires external timing capacitor and resistor, increasing component count
• Availability may vary based on supplier and location

Working Principles

The LF398N/NOPB is a monolithic voltage-to-frequency converter that converts an input voltage into a proportional frequency output. It utilizes a precision voltage-controlled oscillator (VCO) to achieve accurate conversion. The input voltage is applied to the VFC input pin, and the resulting frequency output is directly proportional to the input voltage. By adjusting the control voltage input, the frequency range can be customized.

Detailed Application Field Plans

The LF398N/NOPB finds application in various fields, including:

1. Industrial Automation: Used for process control and monitoring systems.
2. Instrumentation: Utilized in measurement devices such as multimeters and data loggers.
3. Communication Systems: Integrated into frequency modulation (FM) receivers and transmitters.
4. Medical Equipment: Employed in patient monitoring devices and medical instrumentation.
5. Automotive Electronics: Used in vehicle speedometers and engine control units.

Detailed and Complete Alternative Models

1. LM331: Voltage-to-frequency converter with similar specifications and pin configuration.
2. AD654: Monolithic voltage-to-frequency converter with adjustable frequency range.
3. XR4151: Precision voltage-to-frequency converter with wide operating temperature range.

These alternative models provide similar functionality and can be considered as substitutes for the LF398N/NOPB.

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