ALD500A

ADVANCED LINEAR DEVICES, INC. ALD500AU/ALD500A/ALD500 PRECISION INTEGRATING ANALOG PROCESSOR APPLICATIONS 4 1/2 digits to 5 1/2 digits plus sign measurements Precision analog signal processor Precision sensor interface High accuracy DC measurement functions Portable battery operated instruments Computer peripheral PCMCIA BENEFITS Wide dynamic signal range Very high noise immunity Low cost, simple functionality Automatic compensation and cancellation of error sources Easy to use to acquire true 18 bit,17 bit, or 16 bit conversion and noise performance Inherently linear and stable with temperature and component variations FEATURES Resolution up to 18 bits plus sign bit and over-range bit Accuracy independent of input source impedances High input impedance of 1012 Ω Inherently filters and integrates any external noise spikes Differential analog input Wide bipolar analog input voltage range ±3.5V Automatic zero offset compensation Low linearity error - as low as 0.002% Fast zero-crossing comparator - 1µs Low power dissipation - 6mW typical Automatic internal polarity detection Low input current - 2pA typical Microprocessor controlled conversion Optional digital control from a microcontroller, an ASIC, or a dedicated digital circuit Flexible conversion speed versus resolution trade-off PIN CONFIGURATION ALD500 CINT VCAZ BUF AGND C-REF C+REF V-REF 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 V+ DGND COUT B A V+IN V-IN V+REF GENE...