I need to read the pressure from a transducer that puts out 4-20 mA. I was planning on putting an ADC across a precision 250 Ohm resistor to read the voltages from 1v to 5v. I need atleast 16 bits of resolution. I have been searching data pages for a good 16bit ADC but most ratiometric ones are limited to 2.5v. I use an AD7730 24 bit for some projects but it is limited to 80 mv I believe. Do I need to use a Voltage divider to get the voltages low enough or are there any 16 bit ADC that can handle the 1-5V? I dont need very fast output, say less than 20 Hz.
- posted
16 years ago