INA121UA/2K5G4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Instrumentation Amplifier
• Characteristics:
  • High precision and accuracy
  • Low noise and distortion
  • Wide input voltage range
  • High common-mode rejection ratio
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Amplification of small differential signals with high accuracy
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage Range: ±2.25V to ±18V
• Input Offset Voltage: ±150µV (maximum)
• Input Bias Current: ±50nA (maximum)
• Gain Bandwidth Product: 1MHz (typical)
• Input Common-Mode Voltage Range: ±12V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The INA121UA/2K5G4 has a total of 8 pins arranged as follows:

```

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| | --| V+ OUT |-- --| V- REF |-- --| RG IN- |-- --| G IN+ |-- --| NC VS- |-- --| NC VS+ |-- |___________| ```

Functional Features

• High gain accuracy and stability
• Low input offset voltage and bias current
• Excellent common-mode rejection ratio
• Built-in protection against overvoltage and reverse polarity
• Wide supply voltage range for versatile applications

Advantages

• Precise amplification of small differential signals
• Suitable for low-level signal measurements
• High immunity to common-mode noise
• Robust protection features ensure device longevity
• Versatile power supply options enhance flexibility

Disadvantages

• Relatively higher cost compared to basic operational amplifiers
• Limited bandwidth for high-frequency applications
• Requires external resistors for gain configuration

Working Principles

The INA121UA/2K5G4 is an instrumentation amplifier designed to amplify small differential signals with high accuracy. It consists of three operational amplifiers configured in a differential amplifier topology. The input signal is applied to the IN+ and IN- pins, while the RG pin allows for gain adjustment by connecting an external resistor. The amplified output signal is available at the OUT pin, referenced to the REF pin.

Detailed Application Field Plans

The INA121UA/2K5G4 finds extensive use in various precision measurement and sensing applications, including:

1. Biomedical instrumentation: ECG, EEG, and EMG signal amplification.
2. Strain gauge amplification: Load cells, pressure sensors, and force transducers.
3. Temperature measurement: Thermocouples and RTD signal conditioning.
4. Industrial process control: Bridge amplification and sensor interfacing.
5. Data acquisition systems: Low-level signal amplification for accurate measurements.

Detailed and Complete Alternative Models

1. AD620: Instrumentation amplifier with low power consumption and wide supply voltage range.
2. INA128: Precision instrumentation amplifier with higher gain accuracy and lower noise.
3. AD8221: Rail-to-rail instrumentation amplifier suitable for low-voltage applications.

These alternative models offer similar functionality and can be considered based on specific application requirements.

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