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参数资料
型号： XE8801AMI000WP
厂商： Semtech
文件页数： 133/135页
文件大小： 0K
描述： SENSING MACHINE WITH 16 + 10 BIT
标准包装： 558
系列： XE880x
应用： 感测机
核心处理器： Coolrisc816?
程序存储器类型： 闪存（22 kB）
控制器系列： XE8000
RAM 容量： 512 x 8
接口： UART，USRT
输入/输出数： 24
电源电压： 2.4 V ~ 5.5 V
工作温度： -40°C ~ 85°C
安装类型： 表面贴装
封装/外壳： 模具
包装： 托盘
配用： XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名称： Q2722595
Semtech 2005
www.semtech.com
16-12
XE8801A – SX8801R
16.7
ADC Characteristics
The main performance characteristics of the ADC (resolution, conversion time, etc.) are determined by three
programmable parameters. The setting of these parameters and the resulting performances are described later.
sampling frequency fS,
over-sampling ratio OSR, and
number of elementary conversions NELCONV.
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
16.7.2
Sampling Frequency
The word FIN[1:0] is used to select the sampling frequency fS (Table 16-19). Three sub-multiples of the internal
RC-based frequency fRCEXT can be chosen. For FIN = "11", sampling frequency is about 8kHz. Additional information
on oscillators and their control can be found in the clock block documentation.
Sampling Frequency fS (Hz)
FIN[1:0]
XE8801A, SX8801
and XE8805A
XE8802
00
1/4
f
RC
1/8
f
RCEXT
01
1/8
f
RC
1/16
f
RCEXT
10
1/32
f
RC
1/64
f
RCEXT
11
8kHz
4kHz
Table 16-19 Sampling frequency settings (fRC or fRCEXT is the RC oscillator frequency)
Not
Recommended
for
New
Designs
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