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National Semiconductor - 10-Bit Plus Sign Serial I/O A/D Converters with Mux/

Numéro de référence ADC10731
Description 10-Bit Plus Sign Serial I/O A/D Converters with Mux/
Fabricant National Semiconductor 
Logo National Semiconductor 





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ADC10731 fiche technique
May 1999
ADC10731/ADC10732/ADC10734/ADC10738
10-Bit Plus Sign Serial I/O A/D Converters with Mux,
Sample/Hold and Reference
General Description
This series of CMOS 10-bit plus sign successive approxima-
tion A/D converters features versatile analog input multiplex-
ers, sample/hold and a 2.5V band-gap reference. The 1-, 2-,
4-, or 8-channel multiplexers can be software configured for
single-ended or differential mode of operation.
An input sample/hold is implemented by a capacitive refer-
ence ladder and sampled-data comparator. This allows the
analog input to vary during the A/D conversion cycle.
In the differential mode, valid outputs are obtained even
when the negative inputs are greater than the positive be-
cause of the 10-bit plus sign output data format.
The serial I/O is configured to comply with the NSC MI-
CROWIREserial data exchange standard for easy inter-
face to the COPSand HPCfamilies of controllers, and
can easily interface with standard shift registers and micro-
processors.
Features
n 0V to 5V analog input range with single 5V power
supply
n Serial I/O (MICROWIRE compatible)
n 1-, 2-, 4-, or 8-channel differential or single-ended
multiplexer
n Software or hardware power down
n Analog input sample/hold function
n Ratiometric or absolute voltage referencing
n No zero or full scale adjustment required
n No missing codes over temperature
n TTL/CMOS input/output compatible
n Standard DIP and SO packages
Key Specifications
n Resolution
n Single supply
n Power dissipation
n In powerdown mode
n Conversion time
n Sampling rate
n Band-gap reference
10 bits plus sign
5V
37 mW (Max)
18 µW
5µs (Max)
74 kHz (Max)
2.5V ±2% (Max)
Applications
n Medical instruments
n Portable and remote instrumentation
n Test equipment
ADC10738 Simplified Block Diagram
COPS, HPCand MICROWIREare trademarks of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS011390
DS011390-1
www.national.com

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