TLV1852: TLV1852

Hello Banchini.

There is IIB spec. Current at just one input point.

There is this chart. High current for input greater than supply voltage

Zoom in, roughly 1nA at 0V and 125C; So 1.8V and 1nA = 1.8 G ohms 

Current does not flow input to input, so differential input resistance is very high. 

I tried but it does not meet my requirements. I have a source with an impedance of 1MOhm, and I therefore need a comparator that has a minimum differential input resistance of 1GOhm. Using the TLV1862, I still have a considerable (measured) loss. What can I do? Premise: I cannot use buffers between the source and the comparator, I need a clean and direct connection.

I tried but it does not meet my requirements. I have a source with an impedance of 1MOhm, and I therefore need a comparator that has a minimum differential input resistance of 1GOhm. Using the TLV1862, I still have a considerable (measured) loss. What can I do? Premise: I cannot use buffers between the source and the comparator, I need a clean and direct connection.

I tried but it does not meet my requirements. I have a source with an impedance of 1MOhm, and I therefore need a comparator that has a minimum differential input resistance of 1GOhm. Using the TLV1862, I still have a considerable (measured) loss. What can I do? Premise: I cannot use buffers between the source and the comparator, I need a direct connection

Tommaso,

What is your supply voltage, input voltage range and speed requirement?

I can find a higher impedance input, one that doesn't use input as a supply source.

Ron

I have a power supply of +5V and -5V; I would possibly need a rail-to-rail input amplifier with no speed requirements (we're talking about a response time on the order of 100us).

LMC6762 has the lowest input current so the highest input impedance. TLV1812 is also good if temperature range is not too big. 

Tommaso Banchini said:

rail-to-rail input amplifier

Is the original request for comparator still correct?