I'm having a problem designing a circuit to interface an LF398. On it's data sheet it says that it needs +5 and -5 volts, but I only have +5.
My questions are:
Can I put V+ on 5V and V- on ground and still have a viable circuit and how would this constrain my input values?
Is there a way I can get both 5V and -5V without using another IC?
As a plan B, I could use an voltage inverter to get the -5, but this would require another dedicated IC. The samples that I'm trying to hold will be in the -1 to 1 volts range.
A little background: I'm building a pulse oximeter for a class project. We have 2 flashing LEDs that reflect off of skin into a photodiode that is connected to a microcontroller for processing. The series of events should be: LED flash -> Photodiode -> S&H -> Micro. The S&H IC should sample when that specific LED is high.
RM: LF389 does nort exist - changed to LF398