I am trying to use ADS1118IDGST for voltage measurement (+1V, +1.8V, +3.3V, +5V).
I have a doubt regarding connection to the input pins, can you please suggest me how to use that part number.
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This is a rather broad question. In short, you should be able to use the ADS1118 to measure the voltages listed.
At a high level, for the inputs, I would have 2.5V on V_AIN1 and the "measuring voltage" (i.e. +1V, +1.8V, +3.3V, +5V) on V_AIN0. You could have 0V or GND on V_AIN1 but you would halve the dynamic range. I would set the FSR to +/-6.144V, and make sure the device is in single shot mode by writing to the device's registers using SPI. After DOUT/nDRDY toggles, the MCU then read the values from the ADC.
You might want to check out the example code if you have not already. It should help you get started: https://www.ti.com/lit/zip/sbac288
Note, the ADS1118EVM is designed to help the designer rapidly prototype and test performance of the device. You can find the link to that here: https://www.ti.com/tool/ADS1118EVM