INA122PG4

Product Overview

• Category: Integrated Circuit (IC)
• Use: Amplifier
• Characteristics: High precision, low noise, low power consumption
• Package: DIP-8 (Dual In-Line Package with 8 pins)
• Essence: Instrumentation amplifier
• Packaging/Quantity: Tube packaging, 50 units per tube

Specifications

• Supply Voltage: ±2.25V to ±18V
• Input Offset Voltage: ±150µV (maximum)
• Input Bias Current: ±0.5nA (maximum)
• Input Voltage Range: ±Vs - 1.2V
• Gain Bandwidth Product: 200kHz (typical)
• Operating Temperature Range: -40°C to +85°C

Pin Configuration

The INA122PG4 has a total of 8 pins arranged as follows:

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

1. V+ (Positive Supply Voltage)
2. V- (Negative Supply Voltage)
3. REF (Reference Voltage)
4. RG (Gain Setting Resistor)
5. OUTPUT (Amplifier Output)
6. IN- (Inverting Input)
7. IN+ (Non-Inverting Input)
8. NC (No Connection)

Functional Features

• High common-mode rejection ratio (CMRR) of 120dB (minimum)
• Low input offset voltage and bias current for accurate amplification
• Wide supply voltage range allows flexibility in various applications
• Rail-to-rail output swing enables full utilization of the supply voltage range
• Low quiescent current consumption for power-efficient operation

Advantages and Disadvantages

Advantages: - High precision amplification - Low noise performance - Versatile supply voltage range - Wide operating temperature range - Suitable for low-power applications

Disadvantages: - Limited number of pins for additional functionalities - Requires external gain-setting resistor (RG)

Working Principles

The INA122PG4 is an instrumentation amplifier designed to amplify small differential signals while rejecting common-mode noise. It consists of three operational amplifiers configured in a differential amplifier topology. The input signal is applied to the non-inverting and inverting inputs, and the amplified output is obtained from the OUTPUT pin.

The gain of the amplifier is determined by the external gain-setting resistor (RG) connected to the RG pin. By adjusting the value of RG, the desired gain can be achieved. The REF pin provides a reference voltage for the amplifier's internal circuitry.

Detailed Application Field Plans

The INA122PG4 finds applications in various fields, including:

1. Medical Equipment:

   • ECG (Electrocardiogram) amplification
   • EEG (Electroencephalogram) amplification
   • Bioimpedance measurements

2. Industrial Automation:

   • Sensor signal conditioning
   • Process control systems
   • Data acquisition

3. Precision Instrumentation:

   • Strain gauge amplification
   • Thermocouple amplification
   • Bridge sensor amplification

4. Audio Systems:

   • Microphone preamplification
   • Line-level signal amplification
   • Hi-Fi audio amplification

Detailed and Complete Alternative Models

Some alternative models that offer similar functionality to the INA122PG4 are:

1. AD620: Instrumentation Amplifier, DIP-8 package, ±5V to ±18V supply voltage range.
2. MCP6N11: Instrumentation Amplifier, DIP-8 package, ±2.5V to ±18V supply voltage range.
3. INA128: Precision Instrumentation Amplifier, DIP-8 package, ±2.25V to ±18V supply voltage range.

These alternative models can be considered based on specific application requirements and design constraints.

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