INA128U

Product Overview

Category: Integrated Circuit (IC)

Use: The INA128U is a precision instrumentation amplifier designed for accurate signal amplification in various applications.

Characteristics: - High accuracy and precision - Low noise and distortion - Wide input voltage range - High common-mode rejection ratio (CMRR) - Low power consumption

Package: The INA128U is available in a small outline package (SOIC) with 8 pins.

Essence: The essence of the INA128U lies in its ability to amplify weak signals accurately and reliably, making it suitable for use in sensitive measurement and instrumentation systems.

Packaging/Quantity: The INA128U is typically sold in reels or tubes containing multiple units. The exact quantity depends on the supplier and packaging option chosen.

Specifications

• Supply Voltage Range: ±2.25V to ±18V
• Input Offset Voltage: 50µV (maximum)
• Input Bias Current: 0.5nA (maximum)
• Gain Bandwidth Product: 1MHz (typical)
• Common-Mode Rejection Ratio (CMRR): 120dB (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The INA128U has the following pin configuration:

```

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| | --| V+ | --| IN+ | --| IN- | --| REF | --| OUT | --| V- | |___________| ```

Functional Features

• High gain accuracy and stability
• Adjustable gain through external resistors
• Built-in protection against overvoltage and reverse polarity
• Low output impedance for driving loads directly
• Internal frequency compensation for stability

Advantages

• Excellent accuracy and precision in signal amplification
• Low noise and distortion for high-quality signal processing
• Wide input voltage range allows for versatile applications
• High CMRR minimizes interference from common-mode signals
• Low power consumption for energy-efficient operation

Disadvantages

• Limited gain bandwidth product compared to some specialized amplifiers
• Requires external resistors for gain adjustment, adding complexity to the circuit design

Working Principles

The INA128U operates based on the principle of differential amplification. It amplifies the voltage difference between its two input terminals (IN+ and IN-) while rejecting any common-mode voltage present at both inputs. This allows it to amplify small differential signals accurately, even in the presence of noise or interference.

Application Field Plans

The INA128U finds extensive use in various fields, including: 1. Biomedical instrumentation: ECG, EEG, and other medical signal amplification. 2. Industrial process control: Amplification of sensor signals for monitoring and control systems. 3. Audio equipment: Precise amplification of audio signals in professional audio systems. 4. Test and measurement: Accurate signal amplification in laboratory and testing equipment. 5. Communication systems: Signal conditioning and amplification in telecommunication devices.

Alternative Models

1. AD620: Precision instrumentation amplifier with similar specifications.
2. INA114: Higher gain bandwidth product instrumentation amplifier.
3. AD8221: Low-power instrumentation amplifier with low noise characteristics.

These alternative models offer similar functionality and can be considered as substitutes for the INA128U depending on specific requirements.

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