The INA118U can handle input voltages up to ±40V, but it's recommended to keep the input voltage within ±20V for optimal performance and to prevent damage to the device.
To ensure the INA118U operates within its common-mode voltage range, make sure the input common-mode voltage (VCM) is within 1.5V of the supply voltage (VCC) or ground (GND). This can be achieved by using a voltage divider or a resistive network to set the input common-mode voltage.
The REF pin on the INA118U is a reference input that allows the user to set the output voltage of the amplifier to a specific level. This can be useful for applications where a specific output voltage is required, such as in level-shifting or voltage-referenced applications.
To reduce noise and EMI in your INA118U circuit, use proper PCB layout techniques, such as separating analog and digital grounds, using a ground plane, and minimizing trace lengths. Additionally, consider using shielding, filtering, and decoupling capacitors to reduce noise and EMI.
The INA118U can drive up to 10mA of output current, making it suitable for driving small loads such as ADCs or other low-power devices.
INA118U datasheet
by Texas Instruments
