LT1490A output voltage maximum rating

Hi,

The Output Voltage is usually with respect to +VS and -VS, these are VOH and VOL respectively.

Here is an example of +Vs = 3V and 5V, -VS = 0:

For +VS = 15V and -VS = -15V:

You can input way above the supply, as one of the features states that:

May I ask why would you supply 5V at the output?

Regards.

Hi,

The Output Voltage is usually with respect to +VS and -VS, these are VOH and VOL respectively.

Here is an example of +Vs = 3V and 5V, -VS = 0:

For +VS = 15V and -VS = -15V:

You can input way above the supply, as one of the features states that:

May I ask why would you supply 5V at the output?

Regards.

the circuit has the negative feedback loop.

I supply about 5V to +INA(B) and -INA(B).

I wonder if LT1490A is OK when I switch off V+.

I found the following sentense related to output in the datasheet. what does it mean? and can I switch V+ off

without any damage on LT1490A?

The output of the LT1490A/LT1491A can be pulled up to 18V beyond V+ with less than 1nA of leakage current, 

provided that V+ is less than 0.5V

Here is the circuit.

when I switch off 2.8V which is power supply for LT1490A, V+ goes down to 0V.

However +INA,-INA and OUTA are still 3.2-4.2V.

Is IC37(LT1490A) OK?

Hi,

Based on the data sheet, page 11, INPUT section.

The device will operate with their inputs 44V above the V- regardless of V+.

ogura.isao@sankyosha.co.jp said:

when I switch off 2.8V which is power supply for LT1490A, V+ goes down to 0V.

However +INA,-INA and OUTA are still 3.2-4.2V.

When you switched off, the V+ is 0V and you satisfied the condition on page 11, OUTPUT section ("provided, V+ is less than 0.5V").

The device should be okay in your case.

Regards.