NELCO" />
參數(shù)資料
型號(hào): XE8805AMI028LF
廠商: Semtech
文件頁數(shù): 4/156頁
文件大小: 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
標(biāo)準(zhǔn)包裝: 160
系列: XE880x
應(yīng)用: 感測(cè)機(jī)
核心處理器: Coolrisc816?
程序存儲(chǔ)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(yīng)商設(shè)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
16-15
XE8805/05A
SET_NELC[1:0]
(RegAcCfg0[6:5])
# of Elementary
Conversions
NELCONV (-)
00
1
01
2
10
4
11
8
Table 16-21. Number of elementary conversion settings
As already mentioned, NELCONV must be equal or greater than 2 to reduce internal amplifier offsets.
16.7.5
Resolution
The theoretical resolution of the ADC, without considering thermal noise, is given by:
)
(
log
)
(
log
2
ELCONV
N
OSR
n
+
=
(Bits)
(Eq. 15)
5
7
9
11
13
15
17
000
001
010
011
100
101
110
111
SET_OSR
R
e
s
o
lu
ti
o
n
-
n
[B
it
s
]
11
10
01
00
SET_NELC=
Figure 16-6. Resolution vs. SET_OSR[2:0] and SET_NELC[2:0]
SET_NELC
SET_OSR
[2:0]
00
01
10
11
000
6
7
8
9
001
8
9
10
11
010
10
11
12
13
011
12
13
14
15
100
14
15
16
101
16
110
16
111
16
(shaded area: resolution truncated to 16 bits
due to output register size RegAcOut[15:0])
Table 16-22. Resolution vs. SET_OSR[2:0] and SET_NELC[1:0] settings
Using look-up Table 16-22 or the graph plotted in Figure 16-6, resolution can be set between 6 and 16 bits. Notice
that, because of 16-bit register use for the ADC output, practical resolution is limited to 16 bits, i.e. n
≤ 16. Even
if the resolution is truncated to 16 bit by the output register size, it may make sense to set OSR and NELCONV to
higher values in order to reduce the influence of the thermal noise in the PGA (see section 16.8.4).
Not
Recommended
for
New
Designs
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