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## AD7357YRUZ Datasheet(HTML) 11 Page - Analog Devices

 11 / 20 pageAD7357Rev. 0 | Page 11 of 20Intermodulation Distortion (IMD)With inputs consisting of sine waves at two frequencies, faand fb, any active device with nonlinearities creates distortionproducts at sum and difference frequencies of mfa ± nfb wherem, n = 0, 1, 2, 3, and so on. Intermodulation distortion termsare those for which neither m nor n are equal to zero. Forexample, the second-order terms include (fa + fb) and (fa − fb),while the third-order terms include (2fa + fb), (2fa − fb), (fa +2fb), and (fa − 2fb).The AD7357 is tested using the CCIF standard where two inputfrequencies near the top end of the input bandwidth are used.In this case, the second-order terms are usually distanced infrequency from the original sine waves, while the third-orderterms are usually at a frequency close to the input frequencies.As a result, the second- and third-order terms are specifiedseparately. The calculation of the intermodulation distortionis as per the THD specification (see Table 2), where it is theratio of the rms sum of the individual distortion products tothe rms amplitude of the sum of the fundamentals expressedin decibels (dB).Thermal HysteresisThermal hysteresis is defined as the absolute maximum changeof the reference output voltage after the device is cycled throughtemperature from eitherT_HYS+ = 25°C to TMAX to 25°CT_HYS– = 25°C to TMIN to 25°CIt is expressed in ppm using the following equation:610)25()_()25()ppm(×°−°=CVHYSTVCVVREFREFREFHYSwhere:VREF(25°C) is VREF at 25°C.VREF(T_HYS) is the maximum change of VREF at T_HYS+ orT_HYS–.