AD573SD
AD573SD - 10-Bit 20 us SAR ADC, 20-CDIP | Analog Devices
The Analog Devices AD573SD is a complete 10-bit successive-approximation analog-to-digital converter with a typical conversion time of 20 us, one analog input, and a 20-pin ceramic DIP package. It integrates a DAC, voltage reference, clock, comparator, successive-approximation register, and three-state output buffers. According to the manufacturer data, no external components are required to perform a full-accuracy 10-bit conversion. Performance is guaranteed with +5 V and -12 V or -15 V supplies. The AD573SD uses a 20-CDIP package, while the AD573 family also includes other package configurations, so package and temperature-grade details must be checked when comparing variants.
An ADC converts an analog input voltage into a digital code for measurement, control, instrumentation, and industrial signal-processing systems. The AD573 belongs to the SAR ADC family: a successive-approximation register controls an internal DAC while a comparator tests successive bit decisions. SAR converters are useful when a compact, deterministic conversion process and direct digital output are preferred over continuous delta-sigma modulation. The integrated reference, clock, comparator, and output buffers reduce external circuitry and simplify system implementation.
The main verified features include 10-bit resolution, no missing codes over temperature, full or 16-bit microprocessor bus-interface capability, fast successive-approximation conversion with 20 us typical timing, operation from +5 V and -15 V supplies, and monolithic construction. The integrated design can reduce board area and assembly complexity. The parallel three-state outputs are useful when the ADC must share a processor data bus or interface directly with digital control logic.
The AD573SD is suitable for industrial process measurement, data acquisition, instrumentation, test equipment, and legacy control systems requiring a deterministic parallel ADC. A 20-CDIP package provides through-hole mechanical compatibility for systems designed around ceramic DIP footprints, but it is not interchangeable with a surface-mount package without a PCB change. Supply arrangement, signal conditioning, grounding, and digital-bus timing remain important design considerations.
For a new design, use the AD573SD when its 10-bit SAR architecture, integrated functions, parallel interface, and 20-CDIP footprint are specifically required. For higher resolution, different supply architecture, or surface-mount assembly, select a newer ADC whose electrical and pin requirements have been verified. This product page synthesizes verified manufacturer and distributor information, application guidance, and compatibility cautions; missing electrical values are explicitly marked rather than estimated.
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