Sample-and-hold interface with an AD571 10-bit A/D converter (courtesy Analog Devices, Inc.).
The AD571 is an 10-bit successive approximation A/D converter consisting of a DAC, voltage reference, clock, comparator, successive approximation register and output buffers-all fabricated on a single chip. No external components are required to perform a full accuracy 10-bit conversion in 40 µs.
Operating on supplies of +5 V to +15 V and 15 V, the AD571 will accepts analog inputs of 0 V to +10 V unipolar of ±5 V bipolar, externally selectable. When the BLANK and ,CONVERT input is driven low, the three-state outputs will be open and a conversion will commence. Upon completion of the conversion, the,DATA ,READY line goes low and the data appears at the output. Pulling the BLANK and ,CONVERT input
high blanks the outputs and readies the device for the next conversion. The AD571 executes a true 10-bit conversion with no missing codes in 40 µs maximum.
The AD571 is available in two version for the 0°C to +70°C temperature range, the AD571J and K. The AD571S guarantees 10-bit accuracy and no missing codes from 55°C to +125°C.
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Complete A/D Converter with Reference and ClockFast Successive Approximation Conversion: 40 ms maxNo Missing Codes Over Temperature 08C to +708C: AD571K 558C to +1258C: AD571SDigital Multiplexing: Three-State Outputs18-Pin Ceramic DIPLow Cost Monolithic Construction
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V+ to Digital Common
AD571J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to +7 V
AD571K . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to +16.5 V
V to Digital Common . . . . . . . . . . . . . . . . . . 0 V to 16.0 V
Analog Common to Digital Common . . . . . . . . . . . . . . . ±1 V
Analog Input to Analog Common . . . . . . . . . . . . . . . . . ±15 V
Control Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to V+
Digital Outputs (Blank Mode) . . . . . . . . . . . . . . . . . 0 V to V+
Power Dissipation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 800 mW
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Required Field 
