參數(shù)資料
型號: XE8000EV121
廠商: Semtech
文件頁數(shù): 18/53頁
文件大?。?/td> 0K
描述: BOARD EVAL FOR SX8723/24
標(biāo)準(zhǔn)包裝: 1
主要目的: 接口,傳感器至模數(shù)轉(zhuǎn)換器接口,可編程
嵌入式:
已用 IC / 零件: SX8723,SX8724,SX8725
主要屬性: 用于橋型傳感器的信號調(diào)節(jié)
次要屬性: GUI,最多 16 位,1/12 ~ 1000 可編程增益,I2C 接口
已供物品: 板,CD
產(chǎn)品目錄頁面: 585 (CN2011-ZH PDF)
相關(guān)產(chǎn)品: SX8725E083DKR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082DKR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083CT-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082CT-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083TR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082TR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
25
SX8724
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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