Amplitude accuracy of AD2S99 vs Input signal amplitude of AD2S90

Question We would use AD2S90 for the acquisition of a resolver sensor and AD2S99 for the excitation. But the amplitude variations of the excitation in the range of the temperature of the AD2S99 is 2V 10% . It Is the same tolerance as SIN and COS input of AD2S90. My sensor has an inaccuracy between the primary and secondary of 5%. What is the impact on AD2S90 if we use the input range of 2V 15% Answer The AD2S90 is only tested to the input range stated in the data sheet and we cannot guarantee any specifications outside of that range. It should work up to the absolute maximum ratings. The part should work, there may be a small effect on performance. Are you fixed on the AD2S90 and AD2S99 or would you be interested in the newer products, such as the AD2S1210? There is an EP version of that available. http://www.analog.com/en/analog-to-digital-converters/synchroresolver-to-digital -converters/ad2s1210/products/product.html

AD2S90: Angular accuracy and degradation over temperature.

Question Does angular accuracy depend on the value of the input frequency and what angular accuracy degradation results over ambient temperature variations? Answer The angular accuracy is specified for a Reference input frequency from 3 to 20Khz and degradation of angular accuracy is specified to be a min +/-10.6 arc minutes +1LSB for an ambient temperature range that spans –40degC to +85degC.

AD2S90: Can I use the unmodulated outputs for perpendicular HALL sensors instead of a resolver?

Question Can the AD2S90 use the unmodulated outputs for perpendicular HALL sensors instead of a resolver? Answer The limit for the carrier frequency is 3kHz to 20kHz. It won't work with a DC carrier. (The AD2S90 datasheet explains the demodulation mathematically).