參數(shù)資料
型號: ADC0844BCN
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: ADC
英文描述: 8-Bit uP Compatible A/D Converters with Multiplexer Options
中文描述: 4-CH 8-BIT SUCCESSIVE APPROXIMATION ADC, PARALLEL ACCESS, PDIP20
封裝: 0.300 INCH, PLASTIC, DIP-20
文件頁數(shù): 12/20頁
文件大?。?/td> 467K
代理商: ADC0844BCN
Applications Information
(Continued)
LSB is calculated for the desired analog span, 1 LSB = ana-
log 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 transition.
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:
where V
=the high end of the analog input range and
V
=the low end (the offset zero) of the analog range. (Both
are ground referenced.)
The V
(or V
CC
) voltage is then adjusted to provide a code
change from FE
HEX
to FF
HEX
. This completes the adjust-
ment procedure.
For an example see the Zero-Shift and Span Adjust circuit
below.
DS005016-16
a) Ratiometric
DS005016-17
b) Absolute with a Reduced Span
FIGURE 2. Referencing Examples
Zero-Shift and Span Adjust (2V
V
IN
5V)
DS005016-18
www.national.com
12
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