| General > General Technical Chat |
| Minimum operating voltage for the LT1037? |
| (1/1) |
| gamalot:
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? :-// --- 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 |
| tooki:
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.) |
| gamalot:
--- Quote from: tooki 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.) --- End quote --- 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. |
| magic:
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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