参数资料
型号: XE8801AMI000WP
厂商: Semtech
文件页数: 5/135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
16-17
XE8801A – SX8801R
The equivalent LSB size at the input of the PGA chain is:
1
2
1
+
=
OSR
GD
V
LSB
TOT
REF
n
(V)
(Eq. 19)
Notice that the input voltage VIN,ADC of the ADC must satisfy the condition:
1
)
(
2
1
,
+
OSR
V
REFN
REFP
ADC
IN
(V)
(Eq. 20)
to remain within the ADC input range.
16.7.8
Power Saving Modes
During low-speed operation, the bias current in the PGAs and ADC can be programmed to save power using the
control words IB_AMP_PGA[1:0] and IB_AMP_ADC[1:0] (see Table 16-26). If the system is idle, the PGAs and
ADC can even be disabled, thus, reducing power consumption to its minimum. This can considerably improve
battery lifetime.
IB_AMP_ADC
[1:0]
IB_AMP_PGA
[1:0]
ADC
Bias
Current
PGA
Bias
Current
Max. fS
[kHz]
00
01
10
11
x
1/4
I
ADC
1/2
I
ADC
3/4
I
ADC
IADC
x
62.5
125
250
500
x
00
01
10
11
x
1/4
I
PGA
1/2
I
PGA
3/4
I
PGA
IPGA
62.5
125
250
500
Table 16-26. ADC & PGA power saving modes and maximum sampling frequency
16.8
Specifications and Measured Curves
This section presents measurement results for the acquisition chain. A summary table with circuit specifications and
measured curves are given.
16.8.1
Default Settings
Unless otherwise specified, the measurement conditions are the following:
Temperature TA = +25°C
VDD = +5V, GND = 0V, VREF = +5V, VIN = 0V
RC frequency fRC = 2MHz, sampling frequency fS = 500kHz
Offsets GDOff2 = GDOff3 = 0
Power operation: normal (IB_AMP_ADC[1:0] = IB_AMP_PGA[1:0] = '11')
Resolution:
for n = 12 bits: OSR = 32 and NELCONV = 4
for n = 16 bits: OSR = 512 and NELCONV = 2
Not
Recommended
for
New
Designs
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