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why gain is not 1 for LM324VIPT ?

MOspi.488
Associate

Hello we have a circuit that is little sensitive, we are trying to read an analog accelerometer, our board is ready, but i noticed while working with LMV324LIPT as follower when the input voltage is higher than 4.5V the output saturates at this value, this probably is due the Common mode input voltage range (VCC-) - 0.2 to (VCC+) - 1, our input goes up to 5V so we need the AO does the whole range rail to rail.

So we decided changing for LMV324IPT that has the same footprint , this one does not saturates and basically has the whole range, but I noticed that the gain is not 1, example if the input is 3 the output is 2.9 and so on, is this normal for this device? is not rail to rail device means that will give me the whole range same output than input?

1 REPLY 1
MikeDB
Lead

Rail to rail means the input can accept voltages rail to rail. You can never get a device that can output rail to rail so you will need to raise your power supply or divide down your input a little.