参数资料
型号: XE8801AMI000WP
厂商: Semtech
文件页数: 126/135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
16-5
XE8801A – SX8801R
Like most ADCs intended for instrumentation or sensing applications, the ZoomingADC
is an over-sampled
converter (See Note1). The ADC is a so-called incremental converter, with bipolar operation (the ADC accepts both
positive and negative input voltages). In first approximation, the ADC output result relative to full-scale (FS) delivers
the quantity:
2
/
2
/
,
REF
ADC
IN
ADC
V
FS
OUT
(Eq. 1)
in two's complement (see Sections 16.4 and 16.7 for details). The output code OUTADC is -FS/2 to +FS/2 for VIN,ADC
-VREF/2 to +VREF/2 respectively. As will be shown in section 16.6, VIN,ADC is related to input voltage VIN by the
relationship:
REF
TOT
IN
TOT
ADC
IN
V
GDoff
V
GD
V
=
,
(V)
(Eq. 2)
where GDTOT is the total PGA gain, and GDoffTOT is the total PGA offset.
PGA1
PGA2
PGA3
ADC
MU
X
Register Bank
Acquisition Chain
GD1
GD2
GD3
OFF2
OFF3
0
1
2
3
4
5
6
7
0
1
2
3
AC_A
AC_R
RegACOutLSB
RegACOutMSB
8
Sampling Frequency f
S
ADC Busy Flag
Default Settings
Conversion Start
Nbr of Elementary Cycles
Over-Sampling Ratio
Continuous vs. On-Request
Power Saving Modes
PGA Enabling
RegACCfg5
RegACCfg4
RegACCfg3
RegACCfg2
RegACCfg1
RegACCfg0
5
2
4
7
Inputs
V
IN
f
S
V
REF
V
IN,ADC
f
S
MU
X
Figure 16-2. ZoomingADC
detailed functional block diagram
1 Note: Over-sampled converters are operated with a sampling frequency f
S much higher than the input signal's Nyquist rate (typically fS is 20-
1'000 times the input signal bandwidth). The sampling frequency to throughput ratio is large (typically 10-500). These converters include digital
decimation filtering. They are mainly used for high resolution, and/or low-to-medium speed applications.
Not
Recommended
for
New
Designs
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