We need a single channel a2d in the range of +-10V with resolution of 20microVolts
i looked at the AD7732 and its evaluation kit. will this product do the job?
if so, i going to connect it to a linux PC where can I find the command set for the RS232 serial port?
We have not try running the evaluation board on Linux OS, so we are not really sure if it will work. But there is a generic AD7734 generic driver if you wanted to develop your own software. Kindly refer to the link AD7734 - Microcontroller No-OS Driver [Analog Devices Wiki] .