Other Parts Discussed in Thread: LM7705
Hi everyone,
I'm trying to seek a simple method to condition high voltage signal (0-24vdc) for low voltage ADC (0-3.3v).
Specifially, I'll like to scale input signal of 0-10vdc linearly to 0-3.3vdc, and clip any input signal above 10vdc at 3.3vdc output.
We have tried this with a INA146 using V-=0v, V+=4.4v, total gain=0.33. However, one key issue was that at Vin=0, Vout is clipped at min of 0.15v instead of 0v. Is there a good way to solve this?
In addition, the input impedance of INA146 at 100k ohm is too low and may affect the measured system. How can I increase input impedance to >1Mohm?
Thank you so much for your support.
Samuel