Normalized Frequency - f *(OSR/f
參數(shù)資料
型號: XE8801AMI027LF
廠商: Semtech
文件頁數(shù): 20/135頁
文件大?。?/td> 0K
描述: IC DAS 16BIT FLASH 8K MTP 44LQFP
標準包裝: 800
系列: XE880x
應(yīng)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: 44-VFQFN 裸露焊盤
包裝: 托盤
供應(yīng)商設(shè)備封裝: 44-MLPQ(7x7)
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2005
www.semtech.com
16-31
XE8801A – SX8801R
0
0.2
0.4
0.6
0.8
1
1.2
01
2
3
4
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
a
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[-]
NELCONV = 1
0
0.2
0.4
0.6
0.8
1
1.2
01
2
3
4
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
a
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[-]
NELCONV = 2
0
0.2
0.4
0.6
0.8
1
1.2
01
23
4
Normalized Frequency - f *(OSR/fS) [-]
No
rm
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[-]
NELCONV = 4
0
0.2
0.4
0.6
0.8
1
1.2
01234
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
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[-]
NELCONV = 8
Figure 16-26 Frequency response: normalized magnitude vs. frequency for different NELCONV
16.9.5
Power Reduction
The ZoominADC
is particularly well suited for low-power applications. When very low power consumption is of
primary concern, such as in battery operated systems, several parameters can be used to reduce power
consumption as follows:
1)
Operate the acquisition chain with a reduced supply voltage VDD.
2)
Disable the PGAs which are not used during analog-to-digital conversion with ENABLE[3:0].
3)
Disable all PGAs and the ADC when the system is idle and no conversion is performed.
4)
Use lower bias currents in the PGAs and the ADC using the control words IB_AMP_PGA[1:0] and
IB_AMP_ADC[1:0]
. (This reduces the maximum sampling frequency according to Table 16-26.)
5)
Reduce internal RC oscillator frequency and/or sampling frequency.
Finally, remember that power reduction is typically traded off with reduced linearity, larger noise and slower
maximum sampling speed.
Not
Recommended
for
New
Designs
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