The maximum voltage that can be applied to the input pins of the INA128PAG4 is ±40V, but it's recommended to keep it within ±20V to ensure accurate measurements and prevent damage to the device.
The gain of the INA128PAG4 can be calculated using the formula: Gain = 5V / (Rg x Iout), where Rg is the gain resistor and Iout is the output current. The gain resistor value can be selected based on the desired gain and output voltage range.
The REF pin on the INA128PAG4 is used to set the reference voltage for the output stage. It can be connected to a voltage reference or a resistive divider to set the output voltage range. The REF pin should be decoupled with a capacitor to ensure stability.
The INA128PAG4 is designed for low-frequency applications up to 50kHz. While it can be used for higher frequencies, its performance may degrade due to the internal bandwidth limitations. For high-frequency applications, consider using a more suitable instrumentation amplifier like the INA826 or INA827.
To reduce noise and interference in your INA128PAG4 circuit, use proper layout techniques, such as separating analog and digital grounds, using shielding, and minimizing trace lengths. Additionally, consider using filters, such as RC filters or ferrite beads, to reduce high-frequency noise.
INA128PAG4 datasheet
by Texas Instruments
