Overview
The LF347DRG4 is a low-cost, high-speed, JFET-input operational amplifier produced by Texas Instruments. This device is part of the LF347 series, which includes the LF347 and LF347B models. It is characterized by its low input bias and offset currents, high input impedance, and fast slew rate, making it suitable for a variety of high-speed applications. The LF347DRG4 is available in a 14-pin SOIC package and is designed for operation from 0°C to 70°C.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| Input Offset Voltage (VOS) | RS = 10 kΩ, TA = 25°C | 1 | 5 | 10 | mV |
| Input Bias Current | TA = 25°C | - | 50 | - | pA |
| Common-Mode Rejection Ratio (CMRR) | RS ≤ 10 kΩ | 70 | 100 | 100 | dB |
| Supply Voltage Rejection Ratio (PSRR) | VS = ±5V to ±15V | 70 | 100 | 100 | dB |
| Supply Current (IS) | TA = 25°C | 7.2 | 11 | 11 | mA |
| Slew Rate (SR) | VS = ±15V, TA = 25°C | 8 | 13 | 13 | V/μs |
| Gain-Bandwidth Product (GBW) | TA = 25°C | - | 4 | - | MHz |
| Operating Temperature Range | - | 0 | - | 70 | °C |
Key Features
- Low Input Bias and Offset Currents: The LF347DRG4 features very low input bias and offset currents, thanks to its JFET inputs, which provide high input impedance.
- High Speed: The device has a fast slew rate of 13 V/μs and a high gain-bandwidth product, making it suitable for high-speed applications.
- Low Supply Current: Despite its high performance, the LF347DRG4 requires low supply current, typically 11 mA.
- Output Protection: The output is protected against shorts due to the resistive 200-Ω output impedance.
- Single or Dual Supply Operation: The device can be operated as a single-supply or dual-supply operational amplifier, depending on the application.
Applications
- High-Speed Integrators: The LF347DRG4 is suitable for high-speed integrator circuits due to its fast slew rate and high gain-bandwidth product.
- Digital-to-Analog Converters: Its high speed and low input bias currents make it ideal for digital-to-analog converter applications.
- Sample-and-Hold Circuits: The device is also used in sample-and-hold circuits where high speed and accuracy are required.
- General-Purpose Amplification: It can be used in various general-purpose amplification tasks where low noise and high speed are necessary.
Q & A
- What is the typical slew rate of the LF347DRG4?
The typical slew rate of the LF347DRG4 is 13 V/μs.
- What is the input bias current of the LF347DRG4?
The input bias current of the LF347DRG4 is typically 50 pA).
- What is the operating temperature range of the LF347DRG4?
The operating temperature range of the LF347DRG4 is from 0°C to 70°C).
- Can the LF347DRG4 be used in single-supply or dual-supply configurations?
Yes, the LF347DRG4 can be used in both single-supply and dual-supply configurations).
- What is the typical supply current of the LF347DRG4?
The typical supply current of the LF347DRG4 is 11 mA).
- What type of package is the LF347DRG4 available in?
The LF347DRG4 is available in a 14-pin SOIC package).
- What are some common applications of the LF347DRG4?
The LF347DRG4 is commonly used in high-speed integrators, digital-to-analog converters, sample-and-hold circuits, and general-purpose amplification tasks).
- Does the LF347DRG4 have output protection?
Yes, the output of the LF347DRG4 is protected against shorts due to the resistive 200-Ω output impedance).
- What is the gain-bandwidth product of the LF347DRG4?
The gain-bandwidth product of the LF347DRG4 is typically 4 MHz).
- Can the outputs of the LF347DRG4 be shorted to ground indefinitely?
Any of the amplifier outputs can be shorted to ground indefinitely, but more than one should not be simultaneously shorted to avoid exceeding the maximum junction temperature).
