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ALD500 Datasheet(PDF) 1 Page - Advanced Linear Devices |
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ALD500 Datasheet(HTML) 1 Page - Advanced Linear Devices |
1 / 11 page Operating Temperature Range * 0 °C to +70°C0°C to +70°C0°C to +70°C 16-Pin 16-Pin 16-Pin Wide Body Plastic Pin Small Outline Small Outline Package Package (SOIC) Package (SOIC) ALD500PC (16 bit) ALD500SC (16 bit) ALD500SWC (16 bit) ALD500APC (17 bit) ALD500ASC (17 bit) ALD500ASWC (17 bit) ALD500AUPC (18 bit) ALD500AUSC (18 bit) ALD500AUSWC (18 bit) * Contact factory for industrial temperature range 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 - 1 µs • Low power dissipation - 6mW typical • Automatic internal polarity detection • Low input current - 2pA typical • Microprocessor controlled conversion • Optional digital control from a microcon- troller, an ASIC, or a dedicated digital circuit • Flexible conversion speed versus resolution trade-off ALD500AU/ALD500A/ALD500 ADVANCED LINEAR DEVICES, INC. ORDERING INFORMATION 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 GENERAL DESCRIPTION The ALD500AU/ALD500A/ALD500 are integrating dual slope analog processors, designed to operate on ±5V power supplies for building precision analog-to-digital converters. The ALD500AU/ALD500A/ ALD500 feature specifications suitable for 18 bit/17 bit/16 bit resolution conversion, respectively. Together with three capacitors, one resistor, a precision voltage reference, and a digital controller, a precision Analog to Digital converter with auto zero can be implemented. The digital controller can be implemented by an external microcontroller, under either hardware (fixed logic) or software control. For ultra high resolution applications, up to 23 bit conversion can be implemented with an appropriate digital controller and software. The ALD500 series of analog processors accept differential inputs and the external digital controller first counts the number of pulses at a fixed clock rate that a capacitor requires to integrate against an unknown analog input voltage, then counts the number of pulses required to deintegrate the capacitor against a known reference voltage. This unknown analog voltage can then be converted by the microcontroller to a digital word, which is translated into a high resolution number, representing an accurate reading. This reading, when ratioed against the reference voltage, yields an accurate, absolute voltage measurement reading. The ALD500 analog processors consist of on-chip digital control circuitry to accept control inputs, integrating buffer amplifiers, analog switches, and voltage comparators. It functions in four operating modes, or phases, namely auto zero, integrate, deintegrate, and integrator zero phases. At the end of a conversion, the comparator output goes from high to low when the integrator crosses zero during deintegration. ALD500 analog processors also provide direct logic interface to CMOS logic families. Rev. 1.02 © 1999 Advanced Linear Devices, Inc., 415 Tasman Drive, Sunnyvale, California 94089-1706, Tel: (408) 747-1155, Fax: (408) 747-1286 http://www.aldinc.com PIN CONFIGURATION V+ 1 2 3 14 15 16 4 13 B 5 12 A V+REF 6 7 8 10 11 V- CAZ CINT BUF AGND V-REF C+REF 9 V-IN V+IN COUT DGND PC, SC, SWC PACKAGE C-REF ALD500 |
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