Finally, combining equations Eq. 5 to Eq. 7 for the three PGA stages, the input voltag" />
參數(shù)資料
型號： XE8000EV104
廠商： Semtech
文件頁數(shù)： 156/156頁
文件大?。?/td> 0K
描述： EVAL BOARD FOR XE8805AMI028LF
標準包裝： 1
類型： MCU
適用于相關(guān)產(chǎn)品： XE88LC05AMI028
所含物品： 完全組裝的評估板
Semtech 2006
www.semtech.com
16-13
XE8805/05A
Finally, combining equations Eq. 5 to Eq. 7 for the three PGA stages, the input voltage VIN,ADC of the ADC is related
to VIN by:
REF
TOT
IN
TOT
ADC
IN
V
GDoff
V
GD
V
=
,
(V)
(Eq. 9)
where the total PGA gain is defined as:
1
2
3
GD
TOT
=
(V/V)
(Eq. 10)
and the total PGA offset is:
2
3
GDoff
GD
GDoff
TOT
+
=
(V/V)
(Eq. 11)
16.7
ADC Characteristics
The main performance characteristics of the ADC (resolution, conversion time, etc.) are determined by three
programmable parameters:
sampling frequency fS,
over-sampling ratio OSR, and
number of elementary conversions NELCONV.
The setting of these parameters and the resulting performances are described hereafter.
16.7.1
Conversion Sequence
A conversion is started each time the bit START or the bit DEF is set. As depicted in Figure 16-5, a complete
analog-to-digital conversion sequence is made of a set of NELCONV elementary incremental conversions and a final
quantization step. Each elementary conversion is made of (OSR+1) sampling periods TS=1/fS, i.e.:
S
ELCONV
f
OSR
T
/
)
1
(
+
=
(s)
(Eq. 12)
The result is the mean of the elementary conversion results. An important feature is that the elementary
conversions are alternatively performed with the offset of the internal amplifiers contributing in one direction and the
other to the output code. Thus, converter internal offset is eliminated if at least two elementary sequences are
performed (i.e. if NELCONV ≥ 2). A few additional clock cycles are also required to initiate and end the conversion
properly.
Conversion index
Offset
T
ELCONV= (OSR+1)/f S
Elementary
Conversion
1
+
Elementary
Conversion
2
-
Elementary
Conversion
N
ELCONV- 1
+
Elementary
Conversion
N
ELCONV
-
Init
End
T
CONV
Conversion
Result
Figure 16-5. Analog-to-digital conversion sequence
Not
Recommended
for
New
Designs
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