[SOLVED] MAX single rail supply level for OPAMP LT1013

[alexan_e]

Hi

I'm trying to figure out the max positive supply that can be used for LT1013.

The datasheet provides the following info in the absolute max section

Does this mean that the max single rail supply (VCC- to ground) is 44v?

 

[kam1787]

yes, but you need to bias it so the ground is at 22V wrt to the power supply

 

[bigdogguru]

Technically yes, you are correct the Max V_s is 44V.

The Max V_s is typically listed under the parameter search table:




However, the key phrase in this case is, "Absolute Maximum Ratings" which is usually accompanied with a the footer note like the following as does both the TI and Linear Tech datasheets:

Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Rating condition for extended periods may affect device reliability
and lifetime.

† Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

The "Absolute Maximum Ratings" typically indicate the maximum levels the device can be briefly exposed to without the device being permanent damaged.

If the device is operated at "Absolute Maximum Ratings" for extended periods the following maybe indicated:

1. The device may fail to perform at the specifications detailed in the devices datasheet.

2. The lifespan of the device maybe significantly shortened.

Therefore, significantly lower operating levels are typically recommended.

And a Max V_s closer to 30V for a single supply maybe recommended if you require performance close to the specifications in the datasheet for a Max V_s of +/-15V for a dual supply.


BigDog

 

[crutschow]

yes, but you need to bias it so the ground is at 22V wrt to the power supply

Not for the LT1013 op amp. Its input and output can operate down to the negative rail.

 

[alexan_e]

The Max Vs is typically listed under the parameter search table:

That may not necessarily be the max single rail supply allowed, because a value of +- 25v would appear as 50v in that table and I'm not sure that all the opamps take the middle point between Vcc- and Vcc+ as reference for the max supply, or some of them have a max referred to the ground. In any case it is an alternative source of info and as such, good to know.

I don't intend to use the opamp close to the max specs, I will probably be using the opamp with a supply of up to 28v but I just wanted to verify that my understanding of the rating was correct.