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ADC08131 Просмотр технического описания (PDF) - National ->Texas Instruments

Номер в каталогеADC08131 National-Semiconductor
National ->Texas Instruments National-Semiconductor
Компоненты Описание8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function
ADC08131 Datasheet PDF : 22 Pages
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Functional Description (Continued)
Adjusting for an Arbitrary Analog Input
Voltage Range
If the analog zero voltage of the A/D is shifted away from
ground (for example, to accommodate an analog input signal
which does not go to ground), this new zero reference
should be properly adjusted first. A VIN (+) voltage which
equals this desired zero reference plus 12 LSB (where the
LSB is calculated for the desired analog span, using 1 LSB =
analog span/256) is applied to selected “+” input and the
zero reference voltage at the corresponding “−” input should
then be adjusted to just obtain the 00HEX to 01HEX code
transition.
The full-scale adjustment should be made [with the proper
VIN (−) voltage applied] by forcing a voltage to the VIN (+)
input which is given by:
Applications
where:
VMAX = the high end of the analog input range
and
VMIN = the low end (the offset zero) of the analog range.
(Both are ground referenced.)
The VREFIN (or VCC) voltage is then adjusted to provide a
code change from FEHEX to FFHEX. This completes the
adjustment procedure.
A “Stand-Alone” Hook-Up for ADC08138 Evaluation
*Pinouts shown for ADC08138.
For all other products tie to pin functions as shown.
www.national.com
16
DS010749-45
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