参数资料
型号: AB-176
英文描述: AB-176 - EXCHANGING FILES ON THE CUSTOMER SERVICE ELECTRONIC BULLETIN BOARD
中文描述: 抗体- 176 -交换了对客户服务电子公告板锉
文件页数: 5/5页
文件大小: 37K
代理商: AB-176
5
DEFINITIONS (CONT)
V
CODE
= Code Voltage —The voltage corresponding to a
particular digital code in an ideal converter. For
digital-to-analog converters which provide a current
output mode of operation, V
actually referes to
a voltage after a current-to-voltage conversion.
Throughout the text, it is presumed that this
current-to-voltage conversion has occurred.
V
CODE
= (digital code)
10
* V
LSB
(Equation 2)
actually an analog range of voltages encompassed
by V
±
1/2V
. This is due to the inherent
quantization error of
±
1/2V
that is present in the
finite digital output of the ADC.
The value of (digital code)
10
* V
LSB
will be used
throughout this text to represent V
CODE
unless
otherwise stated.
+FS
= Positive Full Scale —The most positive end of an
analog signal’s range which is represented by a
digital code. A V
equal to the positive full
range (+FS) does not exist. The industry standard
is that the most positive voltage corresponding to a
digital code (maximum V
CODE
) is the positive full
scale voltage minus the voltage associated with
one LSB (+FS – 1V
). The text “positive full
scale” (or +FS) refers to this lesser, industry
standard value. This +FS industry standard is
primarily due to another industry standard in which
0V is a code voltage (see Equation 3) bounded by
the absolute value of
±
1/2V
LSB
. In a unipolar
system, this means that the analog voltage range
represented by a digital code corresponding to BPZ
is only 1/2V
. In bipolar systems, all digital codes
have analog ranges of 1V
LSB
, and a digital code
representing 0V is 0V
±
1/2V
LSB
(see Equation 3
and Equation 4).
–FS
= Negative Full Scale — The most negative end of
an analog signal’s range which is represented by a
digital code.
V
t
= Transition voltage — The voltage which corre-
sponds to the actual change of a digital code in
an ideal analog-to-digital converter. These
voltages are the voltages at each end of the range
of V
CODE
±
1/2V
LSB
.
V
t+
= V
CODE
+ 1/2V
LSB
(Equation 3)
V
t–
= V
CODE
– 1/2V
LSB
(Equation 4)
For an ideal digital-to-analog converter, the output
would be exactly V
CODE
, and the transition voltage
can be ignored.
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