The "INA105KP" is a precision instrumentation amplifier manufactured by Texas Instruments. It is commonly used in applications requiring high accuracy in signal measurement, like in medical instrumentation, industrial automation, and sensor signal conditioning.
Key Features:
Brand: Texas Instruments Package: The INA105KP is available in an 8-pin Dual In-line Package (DIP-8).Let's go through the detailed explanation of the pin function specifications, circuit principles, and the full pinout in English, as requested:
INA105KP Pinout Specifications
The INA105KP is an 8-pin device, and the pins are numbered from 1 to 8. Here’s a detailed breakdown of the pin functions:
Pin Number Pin Name Pin Function 1 V+ Positive power supply input. Typically connected to a positive voltage source. 2 V– Negative power supply input. Typically connected to a negative voltage source (or ground). 3 In+ Non-inverting input for the differential signal. Typically connected to the positive input signal. 4 In– Inverting input for the differential signal. Typically connected to the negative input signal. 5 Ref Reference input for setting the output voltage range. Often connected to a mid-supply voltage or ground. 6 Out Output of the instrumentation amplifier. The amplified signal is output from this pin. 7 Gain External resistor input for setting the gain. The gain is set by an external resistor between pins 7 and 8. 8 GND Ground pin. Connect to the system ground for proper operation.Package Type
Package Type: 8-Pin Dual In-line Package (DIP-8) Pin Count: 8 pins in total. Lead Spacing: 2.54mm (standard for DIP-8 packages).Detailed Pin Function Description:
Pin 1 (V+): This pin provides the positive supply voltage to the device. The recommended operating voltage is typically between +3V to +36V, and this voltage is used for the internal circuitry to function properly. The supply voltage should be chosen based on the system's requirements.
Pin 2 (V-): The negative supply voltage is applied to this pin. It is usually connected to ground (0V) in a single-supply system or to a negative voltage supply (for example, -3V to -36V) in a dual-supply system.
Pin 3 (In+): This is the non-inverting input of the instrumentation amplifier. The voltage at this input is amplified by the device in relation to the voltage at the inverting input (Pin 4). The input signal is applied to this pin when working with differential measurements.
Pin 4 (In-): The inverting input is used in conjunction with the non-inverting input (Pin 3) to create the differential signal. The difference in voltage between In+ and In- determines the output signal after amplification.
Pin 5 (Ref): The reference pin allows for the adjustment of the output voltage range. The reference voltage is typically set to the midpoint of the supply voltages for proper signal output. For single-supply configurations, this pin is often tied to the ground, but it can be adjusted based on specific needs.
Pin 6 (Out): The output of the instrumentation amplifier is available at this pin. It provides the amplified version of the differential signal applied to Pins 3 and 4, with a gain determined by the external resistor connected between Pins 7 and 8.
Pin 7 (Gain): This pin is used to set the gain of the amplifier. An external resistor (connected between pins 7 and 8) is used to determine the gain of the INA105KP. The gain is calculated as 1 + (50kΩ / RG), where RG is the value of the resistor between pins 7 and 8.
Pin 8 (GND): This pin is the ground connection for the INA105KP. It should be tied to the system ground for proper operation.
Circuit Principle
The INA105KP is an instrumentation amplifier, designed to amplify differential signals while rejecting common-mode noise. The basic principle behind its operation is as follows:
Differential Amplification: The INA105KP amplifies the difference between the non-inverting input (In+) and the inverting input (In-), while rejecting any common-mode signals (signals that are present equally on both inputs). Gain Setting: The gain of the amplifier is set by the external resistor between pins 7 and 8. This allows the user to control the amount of amplification based on the application needs. Reference Voltage: The Ref pin allows the user to set the reference voltage for the output, enabling flexibility in output voltage range.20 Frequently Asked Questions (FAQ)
What is the function of Pin 1 (V+)? Pin 1 (V+) supplies the positive voltage for the INA105KP to function. What voltage should be applied to Pin 2 (V-)? Pin 2 should be connected to the negative supply voltage, typically ground or a negative voltage source. What is the role of Pin 3 (In+)? Pin 3 is the non-inverting input, where the positive input signal is applied. How does the INA105KP amplify signals? The INA105KP amplifies the difference between the non-inverting and inverting inputs, rejecting common-mode noise. What is Pin 5 (Ref) used for? Pin 5 sets the reference voltage for the output, controlling the output voltage range. How is the output voltage determined? The output voltage is determined by the difference in voltages at Pins 3 and 4, multiplied by the gain. What is the function of Pin 7 (Gain)? Pin 7 is used to set the gain by connecting an external resistor between Pin 7 and Pin 8. Can the INA105KP be used with a single supply? Yes, the INA105KP can operate with a single supply, with Pin 2 (V-) connected to ground. What is the recommended supply voltage for the INA105KP? The recommended supply voltage is between +3V and +36V. What happens if the reference voltage is set incorrectly? An incorrect reference voltage can cause the output signal to be out of the expected range. Can the INA105KP be used for high-precision medical instrumentation? Yes, the INA105KP is ideal for high-precision measurements in medical instrumentation. Is the INA105KP suitable for sensor signal conditioning? Yes, the INA105KP is commonly used for sensor signal conditioning in industrial applications. How does the INA105KP reject noise? It rejects common-mode noise due to its differential amplification design. Can I use the INA105KP in a dual-supply configuration? Yes, it can operate in both single and dual-supply configurations. What is the maximum allowable supply voltage? The maximum supply voltage is 36V. How do I calculate the gain of the INA105KP? The gain is calculated as 1 + (50kΩ / RG), where RG is the resistor between Pin 7 and Pin 8. What is the output impedance of the INA105KP? The output impedance is typically low, designed to drive the output signal to other stages in the circuit. What is the typical application of the INA105KP? It is used in applications requiring high-precision differential signal amplification, such as instrumentation, sensor interface s, and medical devices. Can I use the INA105KP in noisy environments? Yes, the INA105KP’s high common-mode rejection ratio (CMRR) helps it operate effectively in noisy environments. Is the INA105KP available in other package types? The INA105KP is typically available in an 8-pin DIP package, but similar models may be available in other package types such as SOIC or TSSOP.Let me know if you'd like any more details or further clarification!