The INA826AIDGKR is a precision instrumentation amplifier manufactured by Texas Instruments (TI). It is designed to amplify small differential signals in a wide variety of applications.
Package Details
The INA826AIDGKR comes in a VSSOP (Very Small Shrink Outline Package) with 8 pins. This is a surface-mount package designed for applications where space is limited.
Pin Function Specifications
Below is the detailed explanation of each pin's function for the INA826AIDGKR:
Pin Number Pin Name Pin Function Description 1 V- This is the negative Power supply pin. The INA826AIDGKR operates from a dual power supply (e.g., +5V, -5V), and this pin should be connected to the negative supply voltage. It must be properly decoupled to avoid noise. 2 Ref The reference input pin. It is used to adjust the output voltage level. It allows the user to set the baseline output voltage when no differential input is present. Typically, it is tied to the ground or a voltage reference. 3 -IN The negative differential input pin. This is the negative input to the instrumentation amplifier where the small signal or differential input voltage is applied. 4 +IN The positive differential input pin. This is the positive input to the instrumentation amplifier where the small signal or differential input voltage is applied. 5 Output The output pin. This pin outputs the amplified version of the differential input voltage, adjusted by the reference pin and gain setting. 6 Gain The gain setting pin. This pin controls the gain of the amplifier. It is typically connected to an external resistor (or resistor network) to set the desired gain. The gain is set by the formula: Gain = 1 + (50kΩ / Rg), where Rg is the resistor connected to this pin. 7 V+ This is the positive power supply pin. It connects to the positive supply voltage, typically 5V or 3.3V, depending on the application. Proper decoupling of this pin is essential for stable operation. 8 NC No Connection (NC). This pin does not have any functional purpose and is left unconnected in the circuit. It can be used for layout purposes but should not be wired to any signal.Circuit Principle
The INA826AIDGKR is a precision instrumentation amplifier that amplifies the differential input signal and provides a single-ended output. It is designed to offer high accuracy, low offset, low drift, and low power consumption.
Key circuit features:
High Common-Mode Rejection Ratio (CMRR): It can reject common-mode signals, which makes it ideal for applications where noise rejection is critical. Adjustable Gain: The gain is set externally using a resistor (Rg) connected to the Gain pin. This flexibility allows the INA826AIDGKR to handle a wide range of signal amplitudes. Low Power: It is designed for low-power operation, which is useful in battery-powered or energy-efficient designs.Frequently Asked Questions (FAQs)
Here are 20 common FAQs for the INA826AIDGKR model:
Q1: What is the typical application for the INA826AIDGKR? A1: The INA826AIDGKR is typically used in precision signal measurement applications like temperature sensors, pressure sensors, and other differential signal measurement systems where high accuracy and low power consumption are required.
Q2: How is the gain of the INA826AIDGKR set? A2: The gain is set by connecting an external resistor to the Gain pin. The gain formula is: Gain = 1 + (50kΩ / Rg), where Rg is the external resistor connected to the Gain pin.
Q3: Can I use a single power supply for the INA826AIDGKR? A3: The INA826AIDGKR is designed to operate with dual power supplies, but it can be used with a single supply if the input voltage and output voltage are within the acceptable range for single-supply operation.
Q4: What is the input voltage range of the INA826AIDGKR? A4: The input voltage range is determined by the common-mode input voltage, which should be within the range specified in the datasheet to ensure proper operation and linearity.
Q5: What is the output voltage swing range of the INA826AIDGKR? A5: The output voltage swing is typically from V- + 0.5V to V+ - 0.5V, depending on the load and supply voltage.
Q6: What is the input bias current of the INA826AIDGKR? A6: The input bias current is typically in the range of nanoamps and can be found in the datasheet. It is very low, ensuring minimal distortion and offset in sensitive applications.
Q7: Can the INA826AIDGKR handle high input voltages? A7: The INA826AIDGKR is designed for low-voltage differential signal applications. Exceeding the recommended input voltage range may damage the device.
Q8: Is the INA826AIDGKR suitable for audio signal amplification? A8: The INA826AIDGKR is optimized for precision instrumentation applications, not for audio signal amplification. It is best used for small differential voltage measurements.
Q9: What is the maximum power supply voltage for the INA826AIDGKR? A9: The maximum supply voltage is 40V, but the typical operating range is from ±2V to ±18V.
Q10: How does the INA826AIDGKR reject common-mode signals? A10: The INA826AIDGKR features a high Common-Mode Rejection Ratio (CMRR), which allows it to reject common-mode signals and amplify only the differential input signal.
Q11: How should I decouple the power supply pins for stable operation? A11: It is recommended to use a capacitor (e.g., 0.1µF to 10µF) between the V+ and V- pins, close to the device, for effective decoupling and stable operation.
Q12: What is the temperature coefficient of the INA826AIDGKR? A12: The INA826AIDGKR has low offset drift with temperature, making it suitable for precision applications that require stable performance over a wide temperature range.
Q13: How does the reference pin (Ref) work? A13: The reference pin sets the output voltage baseline. If the Ref pin is grounded, the output will be centered around 0V. If it is set to another voltage, the output will shift accordingly.
Q14: What is the noise performance of the INA826AIDGKR? A14: The INA826AIDGKR is designed for low noise operation, making it suitable for applications requiring high accuracy, such as sensor measurements.
Q15: Can I use the INA826AIDGKR in a differential amplifier configuration? A15: Yes, the INA826AIDGKR is an instrumentation amplifier, which is a type of differential amplifier designed for high-precision applications.
Q16: What is the bandwidth of the INA826AIDGKR? A16: The INA826AIDGKR has a wide bandwidth, typically around 1MHz, depending on the gain setting and application.
Q17: How should I select the external resistor for setting the gain? A17: The external resistor (Rg) should be selected based on the desired gain. Higher values of Rg result in higher gain. Use the formula Gain = 1 + (50kΩ / Rg) to determine the appropriate resistor value.
Q18: Is the INA826AIDGKR compatible with single-ended signals? A18: Yes, while the INA826AIDGKR is designed for differential inputs, you can apply a single-ended signal by connecting the other input to ground.
Q19: What is the maximum output load for the INA826AIDGKR? A19: The INA826AIDGKR can drive loads up to 10kΩ with appropriate power supplies, but higher loads may require additional buffering.
Q20: Is the INA826AIDGKR pin-compatible with other instrumentation amplifiers? A20: The INA826AIDGKR is not pin-compatible with all instrumentation amplifiers, as it has a specific pinout for its VSSOP package. Always check the datasheet for compatibility.
