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ADC08138CIWM bảng dữ liệu(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
tên linh kiện ADC08138CIWM
Giải thích chi tiết về linh kiện  8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function
PDF  21 Pages
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nhà sản xuất  NSC [National Semiconductor (TI)]
Trang chủ  http://www.national.com
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ADC08138CIWM bảng dữ liệu(HTML) 16 Page - National Semiconductor (TI)

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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 V
IN (+) voltage which
equals this desired zero reference plus 1⁄2 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 00
HEX to 01HEX code tran-
sition.
The full-scale adjustment should be made [with the proper
V
IN (−) voltage applied] by forcing a voltage to the VIN (+) in-
put which is given by:
where:
V
MAX = the high end of the analog input range
and
V
MIN = the low end (the offset zero) of the analog range.
(Both are ground referenced.)
The V
REFIN (or VCC) voltage is then adjusted to provide a
code change from FE
HEX to FFHEX. This completes the ad-
justment procedure.
Applications
A “Stand-Alone” Hook-Up for ADC08138 Evaluation
DS010749-45
*Pinouts shown for ADC08138.
For all other products tie to pin functions as shown.
www.national.com
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