Hi,
i have an LVDT acquisition chain using LVDT sensor -> AD598SD -> ADA4099-1 configured as diff. amplifier with gain =1 and AD7980S as ADC.
I need to calculate the whole chain accuracy and resolution.
Based on AD AN-539 all errors must be referred to the same point (e.g: input of the AD598) and compared with the FS to calculate the ppm contributions.
I have basic knoledge about error budget analysis, so here are my questions:
- If i refer all errors to the input point (output of the LVDT sensor=input of the AD598), which is the gain of the AD598S to be considered?
- AN-539 separate error contribution for ABSOLUTE ACCURACY, DRIFT and RESOLUTION for the opamp and INA, so i think this is the same approch i had to follows. For the AD7980 which are the error contribution to be considered for the accuracy and which for the resolution?
- As above, for the AD598SD, which are the error contribution to be considered for the accuracy and which for the resolution? (the DS of the S version specifcy as error sources; Signal output non-linearity, Signal output gain error, Signal output gain drift, Signal output offset, Signal output offset drift, Signal output PSRR gain, Signal output PSRR offset, Signal output CMRR gain, Signal output CMRR offset.
Thanks for the help.