Hello , I am using LT1028 in simulation from the datasheet shown below
Pin 1 and 8 are Vos TRIM
Pin 5 is OVER-COMP
regarding Vos:
Vos is input offset voltage-
In my LTSPICE simulate i didnt have in the model i only had input output and zero
The input offset voltage (VOS) is defined as the voltage that must be applied between the two input terminals of the op amp to obtain zero volts at the output.
by the data sheet bellow, how do i know what value should i use?
Thanks.
https://www.digikey.co.il/en/products/detail/analog-devices-inc/LT1028CS8-TRPBF/959596
https://www.snapeda.com/parts/LT102...Analog Devices/view-part/?ref=search&t=LT1028
https://www.analog.com/media/en/technical-documentation/data-sheets/1028fd.pdf

 

Adding a pot to adjust the offset of an op amp is seldom done anymore.
Typically you just use an op amp with an offset low enough for your requirements.
So what are you using the op amp for and what are your offset requirements?

 

1.what do i need to connect in order to adjust the offset voltage?

You add a pot as shown below from the data sheet (aren't data sheets amazing?).

2. what if i connect it to ground?

If you don't use the pot then just leave the pins open.

 

Hello Crutschow, i am confused regarding the exact impelentation of the 1K pot. as shown in the data sheet below.
a potentiometer is a 3 leg device , the middle leg connected with one of the the legs is a variable resistor controlled by the viper.
1.What will happen if i connect +15 on the free leg in the device?
2.here will be a voltage divider between 15 and what other voltage?
3.how do i start adjusting the VOS? shown i put 0V at fitst between the two legs connected to the chip? or 15V?
I cant see how exact i should adjust it.

 

1.What will happen if i connect +15 on the free leg in the device?

Why do you not want to connect it as shown in the data sheet.
That makes no sense.
You connect the 15V to the wiper as shown.

I have no interest in speculating on what would happen with your incorrect connection but you are welcome to try.

I cant see how exact i should adjust it.

You ground the input on your circuit, and adjust for 0V on the opamp output.

 

Hello Crutschow,In this data sheet i also have the OVER_COMP leg which controls the gain bandwidth product.does it have use these days too? If i dont want to use it should i let it float too?
https://www.snapeda.com/parts/LT1028CS8#TR/Analog Devices/datasheet/