Hello,
LM358B accepts the input signal voltage exceeding V+ up to 40V.
My customer is looking for a 2ch opamp like it with lower offset voltage drift and lower offset current drift.
Then I found the below description in TLV9352.
Does it mean it can allow the input voltage exceeding "(V+) + 0.5V" if the current is limited less than 10mA?
Do we have any other good part numbers?
Regards,
Satoshi Obata
Hello Obata-san,
The TLV9352 does not accept up to 40V like the LM358B.
However, the condition that you have mentioned:
V+ = 12V
V- = 0V
Input signal = usually up to 6V. But due to noise, assumed up to about 20V.
There is a 100ohm resistor between the sensor output and the amp input.
So the input current should be limited to about 0.1 ~ 0.2mA.
This is ok. The acceptable abs max common mode voltage is (V+)+0.5V = 12.5V (unless the current is limited). This is due to the ESD protection diodes internal to the op amp, more than 10mA would damage the device.
The output will be (V+) - headroom =
There will need to be some time after the condition is removed in which the op amp takes to recover:
After which, the op amp will behave as expected within the common mode voltage:
All the best,
Carolina
Hey Oba-san,
There are lot of possible options available if they are limiting the input signal to less than 10mA. I can provide a parametric table to help sort by price as necessary.
Could you please share the target package the application is using? Please help specify so we may suggest a more productive list.
Here are the ones in LM358B:
All the best,
Carolina
