參數(shù)資料
型號(hào): SX8725E083TDT
廠商: Semtech
文件頁數(shù): 18/53頁
文件大小: 0K
描述: IC DAS PRESS/TEMP SENS 12MLPD
標(biāo)準(zhǔn)包裝: 1
系列: ZoomingADC™
類型: 數(shù)據(jù)采集系統(tǒng)(DAS)
輸入類型: 差分
輸出類型: 數(shù)字
接口: I²C
安裝類型: 表面貼裝
封裝/外殼: 12-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 12-MLPD
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
其它名稱: SX8725E083TDTDKR
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
25
SX8725
ZoomingADC for Pressure and Temperature Sensing
Conversion Time and Throughput
As explained in Figure 12, conversion time is given by:
(
)
s
ELCONV
CONV
f
OSR
N
T
1
+
=
(s)
Equation 16
and throughput is then simply 1/TCONV. For example, consider an over-sampling ratio of 256, 2 elementary
conversions, and a over-sampling frequency of 500kHz (SET_OSR = "101", SET_NELC = "01", FIN = "00"). In
this case, using Table 14, the conversion time is 515 over-sampling periods, or 1.03ms. This corresponds to a
throughput of 971Hz in continuous-time mode. The plot of Figure 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 14 - Normalized Conversion Time (TCONV*fs) vs. SET_OSR[2:0] and SET_NELC[1:0]
(Normalized to Over-Sampling Period 1/fs)
Note
Some high sample rate configurations can not be used due to 2-WIRE speed limitation.
Figure 13 - Resolution vs. Normalized Conversion Time for Different SET_NELC[1:0]
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
s
o
lu
ti
o
n
-
n
[B
it
s
]
00
SET_NELC
01
10
11
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