Finally, combining equations Eq. 5 to Eq. 7 for the three PGA stages, the input voltag" />
參數(shù)資料
型號： XE8805AMI028LF
廠商： Semtech
文件頁數(shù)： 156/156頁
文件大?。?/td> 0K
描述： IC DAS 16BIT FLASH 8K MTP 64LQFP
標準包裝： 160
系列： XE880x
應用： 感測機
核心處理器： Coolrisc816?
程序存儲器類型： 閃存（22 kB）
控制器系列： XE8000
RAM 容量： 512 x 8
接口： UART，USRT
輸入/輸出數(shù)： 24
電源電壓： 2.4 V ~ 5.5 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 64-LQFP
包裝： 托盤
供應商設備封裝： 64-LQFP（10x10）
產(chǎn)品目錄頁面： 585 (CN2011-ZH PDF)
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
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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