參數(shù)資料
型號: ADC08138CIWM
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: ADC
英文描述: 8-Bit High-Speed Serial I/O A/D Converters with Multiplexer Options, Voltage Reference, and Track/Hold Function
中文描述: 8-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO20
封裝: SO-20
文件頁數(shù): 16/21頁
文件大?。?/td> 488K
代理商: ADC08138CIWM
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 01
HEX
code tran-
sition.
The full-scale adjustment should be made [with the proper
V
() voltage applied] by forcing a voltage to the V
IN
(+) in-
put which is given by:
Applications
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
IN (or V
) voltage is then adjusted to provide a
code change from FE
HEX
to FF
HEX
. This completes the ad-
justment procedure.
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
16
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