INA118U/2K5G4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Instrumentation Amplifier
• Characteristics: High precision, low noise, low power consumption
• Package: SOIC-8
• Essence: Amplification of small differential signals with high accuracy
• Packaging/Quantity: Tape and Reel, 2500 units per reel

Specifications

• Supply Voltage: ±2.25V to ±18V
• Input Offset Voltage: 50µV (maximum)
• Input Bias Current: 500nA (maximum)
• Gain Bandwidth Product: 1MHz (typical)
• Input Common Mode Voltage Range: -Vs + 1.9V to +Vs - 1.9V
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The INA118U/2K5G4 has a total of 8 pins arranged as follows:

```

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

1. V+: Positive Supply Voltage
2. V-: Negative Supply Voltage
3. RG: Gain Setting Resistor
4. G: Gain Setting Terminal
5. IN-: Inverting Input
6. IN+: Non-Inverting Input
7. NC: No Connection
8. NC: No Connection

Functional Features

• High common-mode rejection ratio (CMRR) of 100dB (minimum)
• Low input offset voltage drift of 0.5µV/°C (typical)
• Low input bias current of 50nA (typical)
• Wide input common-mode voltage range
• Rail-to-rail output swing capability

Advantages and Disadvantages

Advantages

• High precision amplification of small differential signals
• Low noise performance
• Low power consumption
• Wide operating temperature range
• Easy to use and integrate into various applications

Disadvantages

• Limited gain bandwidth product compared to some other instrumentation amplifiers
• Requires external gain setting resistor for customization

Working Principles

The INA118U/2K5G4 is an instrumentation amplifier designed to amplify small differential signals with high accuracy. It consists of a differential input stage, a gain stage, and an output buffer. The differential input stage provides high common-mode rejection ratio (CMRR) by rejecting common-mode signals while amplifying the differential signal. The gain stage amplifies the differential signal according to the gain set by the external resistor (RG). The output buffer ensures that the amplified signal is delivered with low distortion and high driving capability.

Detailed Application Field Plans

The INA118U/2K5G4 finds applications in various fields where precise amplification of small differential signals is required. Some of the common application areas include:

1. Biomedical instrumentation: Amplification of bioelectric signals for monitoring and diagnosis purposes.
2. Industrial process control: Signal conditioning and amplification in industrial automation systems.
3. Strain gauge measurement: Precise amplification of strain gauge signals for load cells and force sensors.
4. Temperature measurement: Amplification of small voltage differentials from thermocouples or RTDs.
5. Data acquisition systems: Signal conditioning and amplification for accurate data acquisition.

Detailed and Complete Alternative Models

1. INA114AP: Similar functionality with lower supply voltage range.
2. AD8221ARZ: Instrumentation amplifier with higher gain bandwidth product.
3. AD623AN: Low power instrumentation amplifier with rail-to-rail output.

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

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