Hi,
I am using an ACS758LCB-050B-PFF-T to measure chopped AC current and I feed the output to an LTC1968 to get DC output.
The ACS has an output voltage of 2.5V for 0A current and swings from 0.5V-4.5V.
The LTC1968 has input 1V p-p so I need a way to decrease the ACS voltage from 0.5V-4.5V to 1v p-p and keep the 2.5v as zero output voltage.
As simple resistor divider cannot work because it will decrease all the range including the 2.5V.
So, I need a circuit (op-amp?) with 2 inputs.
Input 1: 2.5v fixed reference voltage.
Input 2: 0.5-4.5v
The output should be:
1.5V for 0.5v on input 2
2.5V for 2.5v on input 2
3.5V for 4.5v on input 2
Any ideas?
I am using an ACS758LCB-050B-PFF-T to measure chopped AC current and I feed the output to an LTC1968 to get DC output.
The ACS has an output voltage of 2.5V for 0A current and swings from 0.5V-4.5V.
The LTC1968 has input 1V p-p so I need a way to decrease the ACS voltage from 0.5V-4.5V to 1v p-p and keep the 2.5v as zero output voltage.
As simple resistor divider cannot work because it will decrease all the range including the 2.5V.
So, I need a circuit (op-amp?) with 2 inputs.
Input 1: 2.5v fixed reference voltage.
Input 2: 0.5-4.5v
The output should be:
1.5V for 0.5v on input 2
2.5V for 2.5v on input 2
3.5V for 4.5v on input 2
Any ideas?