Overview
The LF444CN/NOPB is a quad low power JFET input operational amplifier produced by Texas Instruments. This device is designed to offer many of the same AC characteristics as the industry standard LM148, but with significantly improved DC characteristics. The LF444 is particularly notable for its low input bias current, high gain bandwidth, and low noise voltage, making it an excellent choice for applications where low power dissipation and good electrical characteristics are crucial.
Key Specifications
| Parameter | Condition | Min | Typ | Max |
|---|---|---|---|---|
| Supply Voltage | ±18V | ±18V | ||
| Differential Input Voltage | ±30V | ±30V | ||
| Input Voltage Range | ±15V | ±15V | ||
| Input Bias Current | Tj = 25°C | 10 pA | 50 pA | 100 pA |
| Input Offset Voltage | RS = 10k, TA = 25°C | 2 mV | 5 mV | 10 mV |
| Gain Bandwidth | 1 MHz | |||
| Slew Rate | 1 V/μs | |||
| Input Noise Voltage | TA = 25°C, f = 1 kHz | 35 nV/√Hz | ||
| Input Noise Current | TA = 25°C, f = 1 kHz | 0.01 pA/√Hz | ||
| Input Resistance | Tj = 25°C | 10^12 Ω | ||
| Large Signal Voltage Gain | VS = ±15V, VO = ±10V, RL = 10 kΩ | 25 | 100 | |
| Output Voltage Swing | VS = ±15V, RL = 10 kΩ | ±12 V | ±13 V | |
| Operating Temperature Range | 0°C | 70°C |
Key Features
- Low Input Bias Current: 50 pA (max), significantly reducing input bias and offset currents compared to the LM148.
- High Gain Bandwidth: 1 MHz, ensuring good AC performance.
- High Slew Rate: 1 V/μs, suitable for applications requiring fast signal response.
- Low Noise Voltage: 35 nV/√Hz, making it suitable for low noise applications.
- High Input Impedance: 10^12 Ω, minimizing the impact of the amplifier on the input signal.
- Low Power Consumption: Only one-fourth the supply current of the LM148, making it ideal for power-sensitive applications.
- PIN Compatibility: Pin compatible with the LM148, allowing for easy substitution in existing designs.
Applications
The LF444CN/NOPB is versatile and can be used in a variety of applications, including:
- Analog Signal Processing: Due to its low noise and high gain bandwidth, it is suitable for analog signal amplification and processing.
- Medical Devices: For applications such as pH probe amplifiers and temperature compensators, as shown in the typical application section of the datasheet.
- Aerospace and Military: Available in military temperature range versions, making it suitable for critical and high-reliability applications.
- Industrial Automation: For use in control systems and sensors where low power consumption and high accuracy are required.
Q & A
- What is the maximum supply voltage for the LF444CN/NOPB?
The maximum supply voltage is ±18V. - What is the input bias current of the LF444CN/NOPB?
The input bias current is 10 pA to 100 pA at Tj = 25°C. - What is the gain bandwidth of the LF444CN/NOPB?
The gain bandwidth is 1 MHz. - What is the slew rate of the LF444CN/NOPB?
The slew rate is 1 V/μs. - Is the LF444CN/NOPB pin compatible with the LM148?
Yes, it is pin compatible with the LM148, allowing for easy substitution in existing designs. - What is the operating temperature range for the LF444CN/NOPB?
The operating temperature range is 0°C to 70°C. - What is the input noise voltage of the LF444CN/NOPB?
The input noise voltage is 35 nV/√Hz at TA = 25°C, f = 1 kHz. - What is the input resistance of the LF444CN/NOPB?
The input resistance is 10^12 Ω at Tj = 25°C. - Can the LF444CN/NOPB be used in high-reliability applications?
Yes, it is available in military temperature range versions, making it suitable for critical and high-reliability applications. - How does the LF444CN/NOPB compare to the LM148 in terms of power consumption?
The LF444CN/NOPB draws only one-fourth the supply current of the LM148.
