The part number " INA128U A/2K5" is a precision instrumentation amplifier manufactured by Texas Instruments (TI). This particular part is part of the INA128 series of instrumentation amplifiers and comes in a 8-pin SOIC (Small Outline Integrated Circuit) package.
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INA128UA/2K5 Pin Function Specifications (8-pin SOIC package)
Pin Number Pin Name Pin Function Description 1 V+ (Positive Supply) This is the positive supply pin. It is connected to the positive voltage rail, which powers the internal circuitry of the INA128. The typical supply range is from +2.7V to +40V. 2 Ref (Reference) This is the reference pin, which sets the reference voltage for the output signal. It is typically tied to ground (0V) for single-ended output or used to set the output level in differential mode. 3 In+ (Non-inverting Input) This is the non-inverting input for the differential amplifier. The signal applied to this pin is amplified with respect to the voltage applied to the In- (inverting) pin. 4 In- (Inverting Input) This is the inverting input for the differential amplifier. The signal applied to this pin is amplified with respect to the voltage applied to the In+ (non-inverting) pin. 5 V- (Negative Supply) This is the negative supply pin, which is connected to the negative voltage rail (or ground, for single-supply operation). The typical range is from -2.7V to -40V. 6 Output This is the output pin of the INA128. The amplified signal (differential or single-ended) appears at this pin. The output is a voltage corresponding to the differential input signals, scaled by the gain. 7 Gain (Gain Select Pin) This pin sets the gain of the instrumentation amplifier. By connecting a resistor between this pin and ground, you can configure the gain. The gain of the INA128 is determined by the equation: Gain = 1 + (50kΩ / RG). 8 NC (No Connect) This is a no-connect pin, meaning that it should not be connected to anything in the circuit. It is internally unconnected, serving as a placeholder or for future use.INA128UA/2K5 Pin Function List (8 pins in total)
Pin 1 (V+): Positive power supply pin. Pin 2 (Ref): Reference pin for setting output reference voltage. Pin 3 (In+): Non-inverting input. Pin 4 (In-): Inverting input. Pin 5 (V-): Negative power supply pin. Pin 6 (Output): Output pin for the amplified signal. Pin 7 (Gain): Pin to set gain of the amplifier by using an external resistor. Pin 8 (NC): No connection pin, not used in the circuit.Circuit Principle and Application of INA128
The INA128 is an instrumentation amplifier that amplifies the difference between two input voltages while rejecting any common-mode signals. It is widely used in applications such as:
Signal conditioning for sensors (e.g., temperature, pressure, or load cells). Medical instrumentation, including ECG (electrocardiogram) and EEG (electroencephalogram) systems. Data acquisition systems for high-precision measurements.The device uses a differential amplifier structure with high input impedance, low offset voltage, and low drift. The INA128 features a very low power consumption and can operate with both single-supply or dual-supply configurations. The gain is set by selecting an external resistor (RG) on the Gain pin (Pin 7), with the gain formula of:
[ \text{Gain} = 1 + \frac{50kΩ}{R_G} ]
Frequently Asked Questions (FAQ) about INA128UA/2K5
What is the supply voltage range for INA128UA/2K5? The supply voltage range is from ±2.7V to ±40V or a single supply between 2.7V and 40V.
What is the typical input impedance of INA128? The input impedance of the INA128 is very high, typically 10^12Ω, ensuring minimal load on the signal source.
Can I use INA128 in a single-supply configuration? Yes, the INA128 can be used with a single supply voltage between 2.7V and 40V, and the negative supply pin (Pin 5) can be connected to ground in such configurations.
What is the output voltage swing of INA128? The output voltage swing is typically from (V-) + 0.3V to (V+) - 0.3V. However, it depends on the load resistance and the supply voltages.
How is the gain of the INA128 set? The gain is set using an external resistor (RG) connected to Pin 7 (Gain pin). The gain formula is: Gain = 1 + (50kΩ / RG).
Can the INA128 be used for medical applications? Yes, the INA128 is commonly used in medical instrumentation, such as ECG and EEG systems, due to its low offset voltage and precision.
What is the noise performance of the INA128? The INA128 has a low input noise voltage, typically 25nV/√Hz at 1kHz, making it suitable for low-noise applications.
What is the temperature coefficient of the INA128? The temperature coefficient of the offset voltage is typically 0.15µV/°C, which ensures stability across temperature variations.
What is the typical common-mode rejection ratio (CMRR) for INA128? The CMRR is typically greater than 100dB, making it ideal for differential signal amplification with minimal common-mode noise.
Is the INA128 capable of driving heavy loads? The INA128 is designed for high-impedance loads, and the output drive capability is typically around 10kΩ or greater for optimal performance.
What is the power consumption of the INA128? The typical quiescent current is 1.3mA, making it suitable for battery-powered applications.
How can I improve the precision of INA128? To improve precision, use high-accuracy resistors for setting the gain, and ensure that the reference pin is properly connected for accurate output voltage scaling.
Can the INA128 be used in low-voltage systems? Yes, it can operate in low-voltage systems, with a minimum supply voltage of 2.7V.
What is the input voltage range for the INA128? The input voltage range is typically from (V-) + 0.5V to (V+) - 0.5V, but the device can still function within the common-mode voltage limits.
What kind of package is the INA128UA/2K5 available in? The INA128UA/2K5 is available in an 8-pin SOIC (Small Outline Integrated Circuit) package.
Can the INA128 be used in automotive applications? Yes, the INA128 is suitable for automotive applications where precision and low power are required.
How does the INA128 perform in high-speed applications? The INA128 has a typical bandwidth of 1.5MHz at a gain of 10, making it suitable for many high-speed applications.
What is the offset voltage of the INA128? The typical input offset voltage is 50µV, ensuring high precision in differential voltage measurements.
How should the reference pin (Pin 2) be handled? The reference pin (Pin 2) should typically be connected to ground in most single-ended applications, but it can be adjusted for differential output.
Can the INA128 be used in bridge sensor applications? Yes, the INA128 is well-suited for use with bridge sensors, such as strain gauges, because it provides differential amplification with high accuracy.
I’ve provided a detailed breakdown of the INA128UA/2K5, its pinout, applications, and answers to common questions about the device. Let me know if you need further clarifications!
