Electronics > Projects, Designs, and Technical Stuff

Looking for a rail-to-rail input comparator

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Manx:
Could you recommend some reasonably cheap comparator (better yet, comparator family) that I could use instead of the LM393 family, but that would work with rail-to-rail inputs?

schmitt trigger:
Rail to rail inputs is one of the many selectable parameters, some of them conflicting.
It includes max/min supply voltages, speed, totem pole or open collector outputs, strobing, power consumption, number of devices per IC package, package type and size, output drive capabilities, and of course the price.
Some comparators have special features, like internal references or complementary outputs.

The best is to go to the TI, Maxim, Analog, Onsemi and STMicro websites, look in the products section for comparators, and filter according to your requirements.

For instance:
https://www.ti.com/amplifier-circuit/comparators/overview.html

David Hess:
How about the TLV3701/2/4?

They are 16 volt, 36 microsecond, and push-pull output.

Alti:
LM393 has bipolar PNP inputs with around 20nA biasing current. So if you bias inputs, it will accept rail2rail at a cost of 20nA current draw and higher offset voltage. Add a voltage divider so that when signal is at Vcc then input receives Vcc-1.2V.

T3sl4co1l:
Right, what speed and supply voltage?  Precision offset or no?

Tim

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