it is AD7730 is suitable for my project to do out the digital torque wrench?? i am using strain gauge sensor to get my torque value.
If use AD7730 already, i still need use op amp to connect to the AD7730??
I think you need to check the range of the strain gauge output, based on the sensor specification and the range of strains your system is experiencing.
for the best performance the sensor range should be equivalent to the ADC input range.
if ADC input is -5 to +5 volts for example, the sensor output should be amplified for such a range, to give the best resolution.