參數(shù)資料
型號: XE8801AMI000WP
廠商: Semtech
文件頁數(shù): 3/135頁
文件大小: 0K
描述: SENSING MACHINE WITH 16 + 10 BIT
標準包裝: 558
系列: XE880x
應用: 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: 模具
包裝: 托盤
配用: XE8000MP-ND - PROG BOARD AND PROSTART2 CARD
其它名稱: Q2722595
Semtech 2005
www.semtech.com
16-15
XE8801A – SX8801R
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).
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
luti
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:
Not
Recommended
for
New
Designs
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