Overview
The LF347N, produced by Texas Instruments, is a high-speed, quad JFET-input operational amplifier. This device is characterized by its low input bias and offset currents, high input impedance, wide gain-bandwidth product, and fast slew rate. The LF347N is designed to operate with low supply current while maintaining high performance, making it suitable for a variety of applications requiring high-speed and low noise operation.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage | ±18 | V | ||
| Differential Input Voltage | ±15 | V | ||
| Input Offset Voltage | 3 | 10 | 13 | mV |
| Input Offset Current | 50 | pA | ||
| Input Bias Current | 50 | pA | ||
| Large Signal Voltage Gain | 25 | 100 | V/mV | |
| Output Voltage Swing | ±12 | ±13 | V | |
| Common-Mode Rejection Ratio | 120 | dB | ||
| Power Supply Rejection Ratio | 120 | dB | ||
| Input Resistance | 10^12 | Ω | ||
| Supply Current | 7.2 | mA | ||
| Slew Rate | 8 | 13 | V/μs | |
| Gain Bandwidth Product | 4 | MHz | ||
| Equivalent Input Noise Voltage | 18 | nV/√Hz | ||
| Equivalent Input Noise Current | 0.01 | pA/√Hz | ||
| Operating Temperature Range | 0 | 70 | °C | |
| Storage Temperature Range | -65 | 150 | °C |
Key Features
- High Input Impedance: The LF347N features high input impedance due to its JFET inputs, making it suitable for applications requiring minimal input loading.
- Low Input Bias and Offset Currents: The device has very low input bias and offset currents, typically 50 pA, which is beneficial for high-precision applications.
- Wide Gain Bandwidth: The LF347N has a gain bandwidth product of 4 MHz, enabling it to handle high-frequency signals effectively.
- Fast Slew Rate: With a slew rate of 13 V/μs, this operational amplifier can quickly respond to changes in the input signal.
- Low Supply Current: The device operates with a low supply current of 7.2 mA, making it energy-efficient.
- High Common-Mode Rejection Ratio (CMRR) and Power Supply Rejection Ratio (PSRR): These ratios are high, typically 120 dB, ensuring good noise rejection and stability.
- Output Short-Circuit Protection: The output is protected against shorts due to the resistive 200-Ω output impedance.
Applications
- High-Speed Integrators: The LF347N is suitable for high-speed integrator circuits due to its fast slew rate and wide bandwidth.
- Digital-to-Analog Converters (DACs): Its high speed and low noise characteristics make it ideal for fast DAC applications.
- Sample-and-Hold Circuits: The device's fast response and low input bias currents are beneficial for sample-and-hold circuits.
- Audio and Signal Processing: The LF347N can be used in various audio and signal processing applications requiring high fidelity and low noise.
- General-Purpose Amplification: It can be used in a wide range of general-purpose amplification tasks where high input impedance and low noise are required.
Q & A
- What is the typical slew rate of the LF347N?
The typical slew rate of the LF347N is 13 V/μs.
- What is the gain bandwidth product of the LF347N?
The gain bandwidth product of the LF347N is 4 MHz.
- What are the typical input bias and offset currents of the LF347N?
The typical input bias and offset currents are 50 pA.
- What is the operating temperature range of the LF347N?
The operating temperature range is from 0°C to 70°C.
- What are the common package types for the LF347N?
The LF347N is available in PDIP-14 and SOIC-14 packages.
- What is the typical supply current of the LF347N?
The typical supply current is 7.2 mA.
- Does the LF347N have output short-circuit protection?
Yes, the output is protected against shorts due to the resistive 200-Ω output impedance.
- What are some common applications of the LF347N?
Common applications include high-speed integrators, digital-to-analog converters, sample-and-hold circuits, and general-purpose amplification.
- What is the input resistance of the LF347N?
The input resistance is typically 10^12 Ω.
- What is the equivalent input noise voltage of the LF347N?
The equivalent input noise voltage is typically 18 nV/√Hz.
