The maximum voltage that can be applied to the input pins is 26.5V, which is the absolute maximum rating. However, for normal operation, the input voltage should be limited to the supply voltage (VCC) + 0.3V to ensure accurate measurements.
The gain of the INA2128UAG4 is programmable and can be calculated using the formula: Gain = 28.2 / (Rgain x (1 + (Rf / Rg))), where Rgain is the gain resistor, Rf is the feedback resistor, and Rg is the gain-setting resistor. The gain can be set to 1, 2, 4, 8, 16, 32, or 64.
The REF pin is the reference input pin, which allows the user to set the output voltage of the INA2128UAG4 to a specific level. This can be useful for applications where a specific output voltage is required. To use the REF pin, connect it to a voltage source or a voltage divider, and ensure that the voltage is within the recommended range of 0.05V to VCC - 0.05V.
The INA2128UAG4 has a built-in low-pass filter that can be used to filter out noise and ripple in the output signal. The filter cutoff frequency can be set using an external capacitor (Cf) connected between the FILT pin and GND. The recommended value of Cf is 10nF to 100nF, depending on the desired cutoff frequency.
The INA2128UAG4 has a power-on reset (POR) circuit that ensures the device is in a known state after power-up. When the supply voltage (VCC) rises above 1.5V, the POR circuit resets the device, and the output voltage is set to 0V. The POR circuit also ensures that the device is in a low-power state during power-down.
INA2128UAG4 datasheet
by Texas Instruments
