The part number " INA138NA/3K " refers to an integrated circuit (IC) produced by Texas Instruments (TI), specifically a precision instrumentation amplifier.
Here is a detailed breakdown of the requested information:
Pin Function Specifications & Circuit Principle for INA138NA/3K
Brand: Texas Instruments Model: INA138NA/3K Package: The INA138NA/3K comes in a 8-pin DIP (Dual In-line Package) form factor.Pin Function Table (Detailed Description)
Pin Number Pin Name Pin Function Description 1 V+ Positive Power supply pin. This is the pin to connect the positive voltage supply. 2 V- Negative power supply pin. This is the pin to connect the negative voltage supply or ground. 3 REF Reference input pin for the output voltage. The voltage here sets the reference level for the output. 4 IN+ Positive input of the differential amplifier. Signals are applied to this pin for measurement. 5 IN- Negative input of the differential amplifier. Signals are applied to this pin for measurement. 6 OUT Output pin. The processed differential input signal is output here. This pin provides the output voltage corresponding to the difference between IN+ and IN-. 7 NC No connection. This pin is not internally connected to the device and is not used. 8 NC No connection. This pin is also not used and does not affect circuit operation.Pin Count: 8 pins (Dual In-line Package)
Circuit Principle Overview
The INA138 is a precision instrumentation amplifier that amplifies the difference between two input signals (IN+ and IN-) and outputs a voltage proportional to this difference, which is referenced to the voltage applied at REF. The gain of the amplifier is determined by external resistors, making it adjustable for various applications.
Powering the INA138: The device requires a dual power supply (V+ and V-) to operate. Inputs (IN+ and IN-): These pins are the differential inputs where the signal is applied. Reference Pin (REF): By adjusting the voltage at this pin, you can set the output reference voltage. Output (OUT): The output pin gives a voltage proportional to the difference between the two input signals.Frequently Asked Questions (FAQs)
1. What is the maximum supply voltage for INA138NA/3K? The maximum supply voltage for INA138NA/3K is ±18V, meaning you can use voltages in the range of +18V to -18V.
2. Can INA138 be used with a single supply voltage? Yes, INA138 can be used with a single supply voltage. The minimum voltage for single-supply operation is typically +5V.
3. What is the gain of INA138? The gain of INA138 is externally adjustable and can be set using an external resistor. The typical gain is set to 1, but it can be adjusted using the appropriate gain-setting resistor.
4. How do I set the gain on INA138? The gain is set by an external resistor between pins 1 and 8. The formula for gain is: Gain = 1 + (2 * RG / RG2) Where RG is the resistor between pins 1 and 8, and RG2 is the internal resistor.
5. What is the input voltage range for INA138? The input voltage range of INA138 is limited by the supply voltage, with a maximum input voltage of approximately V+ - 2V and a minimum of V- + 2V.
6. Can I use INA138 with only 5V as the power supply? Yes, INA138 can be powered with a 5V supply. The device can operate with a minimum supply voltage of 3V and up to 18V.
7. What is the output voltage range of INA138? The output voltage range of INA138 is typically V- + 0.5V to V+ - 0.5V.
8. Does INA138 have rail-to-rail input? No, INA138 does not have rail-to-rail inputs, but it has a wide input voltage range that makes it suitable for many applications.
9. How accurate is INA138? INA138 offers high precision with typical offset voltage of 25µV and low drift over temperature.
10. What is the recommended operating temperature range for INA138? The recommended operating temperature range for INA138 is -40°C to 125°C.
11. Can INA138 handle differential signals from 0V? Yes, INA138 can handle differential signals that range from 0V, provided the input signal lies within the acceptable input voltage range.
12. What is the output impedance of INA138? The output impedance of INA138 is typically 100Ω, which is low enough for most applications.
13. How do I calculate the output voltage of INA138? The output voltage can be calculated using the formula: VOUT = Gain * (VIN+ - VIN-) + VREF.
14. Can INA138 drive a load directly? INA138 can drive small loads directly, but for higher current loads, it may require an additional buffer stage or operational amplifier.
15. What is the input bias current of INA138? The input bias current of INA138 is typically 10nA, which is quite low and reduces errors in high-impedance applications.
16. How does INA138 improve signal integrity in noisy environments? INA138 has a low noise figure and high Common Mode Rejection Ratio (CMRR), making it effective at rejecting common-mode noise.
17. Is INA138 suitable for precision measurement applications? Yes, INA138 is ideal for precision measurement applications such as sensor interfacing, differential signal amplification, and signal conditioning.
18. What kind of applications use INA138? INA138 is used in medical instrumentation, industrial control systems, and precision measurement applications where accurate differential signals need to be amplified.
19. Can I use INA138 for audio signal amplification? INA138 is generally not recommended for audio signal amplification due to its specific design for precise, low-level differential signals.
20. How should I filter the output signal from INA138? For optimal performance, you can use low-pass filters or active filters to eliminate high-frequency noise from the INA138 output.
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