参数资料
型号: XE8805AMI028LF
厂商: Semtech
文件页数: 5/156页
文件大小: 0K
描述: IC DAS 16BIT FLASH 8K MTP 64LQFP
标准包装: 160
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: 64-LQFP
包装: 托盘
供应商设备封装: 64-LQFP(10x10)
产品目录页面: 585 (CN2011-ZH PDF)
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
Semtech 2006
www.semtech.com
16-16
XE8805/05A
16.7.6
Conversion Time & Throughput
As explained using Figure 16-5, conversion time is given by:
S
ELCONV
CONV
f
OSR
N
T
/
)
1
)
1
(
+
=
(s)
(Eq. 16)
and throughput is then simply 1/TCONV. For example, consider an over-sampling ratio of 256, 2 elementary
conversions, and a sampling frequency of 500kHz (SET_OSR = "101", SET_NELC = "01", fRC = 2MHz, and FIN =
"00"). In this case, using Table 16-23, the conversion time is 515 sampling periods, or 1.03ms. This corresponds to
a throughput of 971Hz in continuous-time mode. The plot of Figure 16-7 illustrates the classic trade-off between
resolution and conversion time.
SET_NELC[1:0]
SET_OSR
[2:0]
00
01
10
11
000
10
19
37
73
001
18
35
69
137
010
34
67
133
265
011
66
131
261
521
100
130
259
517
1033
101
258
515
1029
2057
110
514
1027
2053
4105
111
1026
2051
4101
8201
Table 16-23. Normalized conversion time (TCONV fS) vs. SET_OSR[2:0] and
SET_NELC[1:0]
(normalized to sampling period 1/fS)
4.0
6.0
8.0
10.0
12.0
14.0
16.0
10.0
100.0
1000.0
10000.0
Normalized Conversion Time - TCONV*fS [-]
R
e
so
lu
ti
on
-
n
[
B
it
s
]
00
SET_NELC
01
10
11
Figure 16-7. Resolution vs. normalized conversion time for different SET_NELC[1:0]
16.7.7
Output Code Format
The ADC output code is a 16-bit word in two's complement format (see Table 16-24). For input voltages outside the
range, the output code is saturated to the closest full-scale value (i.e. 0x7FFF or 0x8000). For resolutions smaller
than 16 bits, the non-significant bits are forced to the values shown in Table 16-25. The output code, expressed in
LSBs, corresponds to:
OSR
V
OUT
REF
ADC
IN
ADC
1
2
,
16
+
=
(LSB)
(Eq.17)
Recalling equation Eq. 9, this can be rewritten as:
Not
Recommended
for
New
Designs
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