Overview
The LM348N is a quadruple, independent, high-gain, internally compensated operational amplifier produced by Texas Instruments. It is designed to have operating characteristics similar to the µA741, but with several improvements such as lower supply-current drain and reduced input bias and offset currents. This device is part of the LM148, LM248, and LM348 series, each with different operating temperature ranges, making it versatile for various applications.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Offset Voltage | TA = 25°C, RS ≤ 10 kΩ | 1.0 | 5.0 | 6.0 | mV |
| Input Offset Current | TA = 25°C | 4 | 25 | 50 | nA |
| Input Bias Current | TA = 25°C | 30 | 100 | 200 | nA |
| Input Resistance | TA = 25°C | 0.8 | 2.5 | 2.5 | MΩ |
| Supply Current (all amplifiers) | TA = 25°C, VS = ±15V | 2.4 | 3.6 | 4.5 | mA |
| Gain Bandwidth Product | TA = 25°C | 1.0 | 1.0 | 1.0 | MHz |
| Slew Rate | TA = 25°C | 0.5 | 0.5 | 0.5 | V/μs |
| Phase Margin | TA = 25°C, AV = 1 | 60 | 60 | 60 | degrees |
| Common Mode Rejection Ratio | TA = 25°C, VIC = VICRmin | 70 | 90 | 90 | dB |
| Supply Voltage Rejection Ratio | TA = 25°C, VCC± = ±9 V to ±15 V | 77 | 96 | 96 | dB |
| Output Short Circuit Current | TA = 25°C | 25 | 25 | 25 | mA |
| Operating Temperature Range | 0°C | 70°C | °C | ||
| Package Type | PDIP, SOIC, SOP | ||||
| Pin Count | 14 |
Key Features
- Low Supply Current Drain: The LM348N has a low supply current of 0.6 mA per amplifier, making it energy-efficient.
- Class AB Output Stage: This feature eliminates crossover distortion, ensuring high-quality output signals.
- Low Input Offset Voltage and Current: The device has low input offset voltage (1 mV to 6 mV) and current (4 nA to 50 nA), which are significantly better than those of the standard µA741.
- High Degree of Isolation Between Amplifiers: Each amplifier is independently biased, and layout techniques minimize thermal coupling, providing excellent isolation between amplifiers.
- Input/Output Overload Protection: The LM348N includes protection for both input and output overloads, enhancing reliability.
- Unity-Gain Bandwidth and Slew Rate: The device has a unity-gain bandwidth of 1 MHz and a slew rate of 0.5 V/μs, suitable for a wide range of applications.
Applications
- General Purpose Amplification: The LM348N is suitable for various general-purpose amplification tasks due to its high gain and low noise characteristics.
- Audio and Signal Processing: Its low distortion and high slew rate make it ideal for audio and signal processing applications.
- Instrumentation and Measurement: The device's low input offset voltage and current make it suitable for precision instrumentation and measurement applications.
- Industrial Control Systems: The LM348N can be used in industrial control systems where multiple amplifiers are required, offering cost-effective performance.
Q & A
- What is the typical supply current for the LM348N?
The typical supply current for the LM348N is 2.4 mA to 4.5 mA for all four amplifiers.
- What is the input offset voltage range for the LM348N?
The input offset voltage range for the LM348N is 1 mV to 6 mV.
- What is the operating temperature range for the LM348N?
The operating temperature range for the LM348N is 0°C to 70°C.
- Does the LM348N have input/output overload protection?
Yes, the LM348N includes protection for both input and output overloads.
- What is the gain bandwidth product of the LM348N?
The gain bandwidth product of the LM348N is 1 MHz.
- What is the slew rate of the LM348N?
The slew rate of the LM348N is 0.5 V/μs.
- Is the LM348N pin-compatible with other op-amps?
The LM348N is pin-compatible with the LM124 and has similar operating characteristics to the µA741.
- What are the common package types for the LM348N?
The LM348N is available in PDIP, SOIC, and SOP packages.
- How many channels does the LM348N have?
The LM348N has four independent channels.
- What is the typical dual supply voltage for the LM348N?
The typical dual supply voltage for the LM348N is ±12 V, ±15 V, ±5 V, or ±9 V.
