INA128P

Product Overview

Category: Integrated Circuit (IC)

Use: The INA128P is a precision instrumentation amplifier designed for accurate signal amplification in various applications. It provides high gain, low noise, and excellent common-mode rejection ratio (CMRR).

Characteristics: - High gain - Low noise - Excellent CMRR - Wide input voltage range - Low power consumption

Package: DIP (Dual Inline Package)

Essence: The INA128P is an essential component in electronic circuits that require precise amplification of small signals while rejecting common-mode noise.

Packaging/Quantity: The INA128P is typically sold in packs of 10 or more.

Specifications

• Supply Voltage Range: ±2.25V to ±18V
• Input Voltage Range: ±Vs - 1.5V
• Gain Bandwidth Product: 200 kHz
• Input Offset Voltage: 50 µV (max)
• Input Bias Current: 500 nA (max)
• Common-Mode Rejection Ratio: 120 dB (min)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The INA128P has eight pins arranged as follows:

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| | | 1 2 3 4| |_______________________| | | | 5 6 7 8| |_______________________| ```

1. REF (Reference Voltage)
2. V-
3. V+
4. RG (Gain Setting Resistor)
5. OUTPUT
6. NC (No Connection)
7. NC (No Connection)
8. VS- (Negative Power Supply)

Functional Features

• High gain amplification of small signals
• Excellent rejection of common-mode noise
• Low noise and distortion
• Wide input voltage range for versatile applications
• Flexible gain setting with external resistor (RG)

Advantages

• Precise amplification of small signals
• High common-mode rejection ratio
• Low noise and distortion
• Wide operating temperature range
• Versatile gain setting options

Disadvantages

• Requires external gain-setting resistor
• Limited availability in certain package types

Working Principles

The INA128P operates based on the principle of differential amplification. It amplifies the difference between the V+ and V- inputs while rejecting any common-mode signal present at both inputs. This allows for accurate amplification of small signals while minimizing noise and interference.

Detailed Application Field Plans

The INA128P finds application in various fields, including:

1. Biomedical instrumentation: Used in ECG (Electrocardiogram) and EEG (Electroencephalogram) devices for precise signal amplification.
2. Industrial automation: Employed in sensor signal conditioning circuits to amplify and process weak sensor outputs.
3. Audio equipment: Utilized in audio preamplifiers to enhance weak audio signals before further processing.
4. Strain gauge measurement: Applied in strain gauge bridges to amplify and measure minute changes in resistance.

Detailed and Complete Alternative Models

1. AD620: Another precision instrumentation amplifier with similar characteristics and pin configuration.
2. INA114: Offers higher gain bandwidth product and lower input offset voltage compared to INA128P.
3. AD8221: Provides low power consumption and rail-to-rail input/output capabilities.

These alternative models can be considered based on specific requirements and availability.

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