AD2S82AHP

The AD2S82AHP is one member of the AD2S82A series.The AD2S82A is a monolithic 10-, 12-, 14- or 16-bit tracking resolver-to-digital converter contained in a 44-lead J leaded PLCC package. Two extra functions are provided in the new surface mount packageCOMPLEMENT and VCO output.

Features of the AD2S82AHP are:(1)monolithic (BiMOS ll) tracking R/D converter;(2)ratiometric conversion;(3)low power consumption: 300 mW typ;(4)dynamic performance set by user;(5)ESD class 2 protection (2,000 V min);(6)industrial temperature range.The AD2S81A is a monolithic 12-bit fixed resolution tracking resolver-to-digital converter packaged in a 28-lead DIP.The converters allow users to select their own dynamic performance with external components. This allows the users great flexibility in defining the converter that best suits their system requirements.The AD2S82A allows users to select the resolution to be 10, 12,14 or 16 bits and to track resolver signals rotating at up to 1040 revs per second (62,400 rpm) when set to 10-bit resolution.

The absolute maximum ratings of the AD2S82AHP can be summarized as:(1)any logical input:0.4 V dc to +Vl dc;(2)demodulator input:+14 V toVs;(3)integrator input:+14 V toVs;(4)power dissipation:860 mW.The two signal ground wires from the resolver should be joined at the SIGNAL GROUND pin of the resolver to minimize the coupling between the sine and cosine signals. For this reason it is also recommended that the resolver is connected using individually screened twisted pair cables with the sine, cosine and reference signals twisted separately.The AD2S82A is remarkably tolerant of input amplitude and frequency variation because the conversion depends only on the ratio of the input signals. Consequently there is no need for accurate, stable oscillator to produce the reference signal. The inclusion of the phase sensitive detector in the conversion loop ensures a high immunity to signals that are not coherent or are in quadrature with the reference signal.These operating conditions are selected primarily to establish a repeatable acceptance test procedure which can be traced to national standards. In practice, the AD2S82A can be used well outside these operating conditions providing the above points are observed.