INA122U/2K5

Product Overview

• Category: Integrated Circuit (IC)
• Use: Amplifier
• Characteristics: High precision, low noise, low power consumption
• Package: SOIC (Small Outline Integrated Circuit)
• Essence: Instrumentation amplifier
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: ±2.25V to ±18V
• Input Offset Voltage: ±150µV (maximum)
• Input Bias Current: ±50nA (maximum)
• Gain Bandwidth Product: 200kHz (typical)
• Input Common-Mode Voltage Range: -Vs + 1.8V to +Vs - 1.8V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The INA122U/2K5 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+ |-- |___________| ```

1. V+: Positive supply voltage pin
2. OUT: Output pin
3. V-: Negative supply voltage pin
4. REF: Reference pin
5. RG: Gain resistor connection pin
6. G: Gain setting pin
7. NC: No connection pin
8. NC: No connection pin

Functional Features

• High common-mode rejection ratio (CMRR) of 120dB (minimum)
• Low input offset voltage drift of 0.5µV/°C (typical)
• Low quiescent current of 700µA (typical)
• Wide input common-mode voltage range
• Rail-to-rail output swing

Advantages and Disadvantages

Advantages

• High precision amplification
• Low noise performance
• Low power consumption
• Wide operating temperature range
• Versatile packaging options

Disadvantages

• Limited gain bandwidth product compared to some alternatives
• Higher cost compared to basic operational amplifiers

Working Principles

The INA122U/2K5 is an instrumentation amplifier designed to amplify small differential signals while rejecting common-mode noise. It consists of three operational amplifiers configured in a specific way to achieve high gain, high CMRR, and low offset voltage.

The input signal is applied to the IN+ and IN- pins, and the gain can be set using an external resistor connected to the RG pin. The amplified output signal is available at the OUT pin, with the reference voltage provided at the REF pin.

Detailed Application Field Plans

The INA122U/2K5 finds applications in various fields where precise amplification of small differential signals is required. Some of the common application areas include:

1. Medical instrumentation: ECG (Electrocardiogram), EEG (Electroencephalogram), and other bio-potential measurements.
2. Industrial process control: Amplification of sensor signals in temperature, pressure, and flow measurement systems.
3. Strain gauge amplification: Precise measurement of strain in structural monitoring and load cell applications.
4. Data acquisition systems: Signal conditioning for accurate measurement of analog signals in data acquisition systems.
5. Test and measurement equipment: Amplification of low-level signals in oscilloscopes, spectrum analyzers, and other test instruments.

Detailed and Complete Alternative Models

1. AD620: Instrumentation amplifier with similar specifications and pin configuration.
2. INA128: Precision instrumentation amplifier with higher gain bandwidth product.
3. AD8221: Low power instrumentation amplifier with rail-to-rail output swing.

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

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