Part Number: LM339
I have an application(Solar inverter) where I have to sense AC/DC voltages, current and generate reference voltages (1.65V and 2.5V). I was confused between LM339 and LM074 quad amplifier.
Also, on what parameter I should compare amplifiers when using in a solar application.
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In reply to kai klaas69:
Yes, It is TL074.
Right now I am following the sensors schematic from the Ti Design Document --TIDM-HV-1PH-DCAC.
DC Voltage Sensing.
AC voltage sensing.
1.65V from 3.3V
I am open to both types of supply voltages(Unipolar or bipolar) as I haven't selected the IC yet.
Ti is using OPA4350 in their circuit which utilizes a unipolar supply. Though I have also seen the sensing solution implemented via TL074 also.
I also wanted to know the role/effects of supply in implementing the sensing part if I am using the above two schematics for AC and DC voltage sensing.
In reply to archit khandelwal:
Hi Archit, the TL074 is an OPAmp of the past, almost a dino under the OPAmps. The common mode input voltage range is very limited, which wasn't an issue at the time when OPAmps where powered by a bipolar +/-15V supply voltage. But modern customers need OPAmps which can run at a low single supply voltage. The OPA4350, which is a modern RRIO OPAmp, fullfills this need. Another disadvantage of TL074 is its rather high input offset voltage. Because of that I have widely used the TL052/54 for measuring purposes in the past. By the way, the OPA4350 also has a low input offset voltage, even lower than the TL052. Kai
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