Author Topic: Minimum operating voltage for the LT1037?  (Read 764 times)

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Offline gamalotTopic starter

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Minimum operating voltage for the LT1037?
« on: December 03, 2022, 03:34:23 pm »
It is easy to find that the limit of working voltage is ±22V, so what is the minimum working voltage?

I think I read the datasheet carefully, is it my presbyopia?  :-//

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It works fine in LTSpice down to ±2.5V, but I'd still like to find information in an official document.

https://www.analog.com/media/en/technical-documentation/data-sheets/lt1007-lt1037.pdf
« Last Edit: December 03, 2022, 03:38:04 pm by gamalot »
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Offline tooki

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Re: Minimum operating voltage for the LT1037?
« Reply #1 on: December 03, 2022, 04:38:14 pm »
They don’t list it as a number in a list. But various of the specs are given at different supply voltages (like PSRR on page 3: “VS = ±4.5V to ±18V”), and the curves on pages 5 and 6 that plot various things against the supply voltage. It’s no accident that those curves don’t extend to zero: they’re telling you that no performance is specified at those very low voltages. (Which means they aren’t guaranteed to work there.)
 
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Offline gamalotTopic starter

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Re: Minimum operating voltage for the LT1037?
« Reply #2 on: December 03, 2022, 04:49:11 pm »
They don’t list it as a number in a list. But various of the specs are given at different supply voltages (like PSRR on page 3: “VS = ±4.5V to ±18V”), and the curves on pages 5 and 6 that plot various things against the supply voltage. It’s no accident that those curves don’t extend to zero: they’re telling you that no performance is specified at those very low voltages. (Which means they aren’t guaranteed to work there.)

Maybe back then people were not particularly concerned about low voltage performance, in their modern devices (such as the famous LTC2057) the data sheet clearly lists the minimum operating voltage.
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Offline magic

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Re: Minimum operating voltage for the LT1037?
« Reply #3 on: December 03, 2022, 05:05:43 pm »
This chip is 40 years old or something like that, and it surely doesn't look like it was designed for 5V operation, let alone 3.3V :P

Search the datasheet for "Vs" or "supply" and you will get some idea of what they guarantee (not a lot) and what they declare about typical performance (a little more).

Most importantly, they show common mode input range for supply voltages of ±3V or higher - basically you need to stay 3V away from each supply rail to expect good operation at all temperatures.

They also show gradual loss of DC gain at less than ±10V supply. CMRR and PSRR may decrease by a similar ratio, but those are not shown.
 
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