www.semtech.com/products/ Page 31 ADVANCED COMMUNICATIONS & SENSING DATASHEET SX8725C ZoomingADC fo" />
參數(shù)資料
型號: SX8725CWLTDT
廠商: Semtech
文件頁數(shù): 25/68頁
文件大?。?/td> 0K
描述: IC DAS ADC 16BIT I2C/SRL
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-WDFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 12-MLPD-EP(4x4)
包裝: 標(biāo)準(zhǔn)包裝
其它名稱: SX8725CWLTDTDKR
www.semtech.com/products/
Page 31
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
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 .
7.7.6 Conversion Time & Throughput
As explained in Figure 15, conversion time is given by:
and throughput is then simply 1/TCONV. For example, consider an over-sampling ratio of 256, 2 elementary conversions,
and a sampling frequency of 500 kHz (SetOsr = "101", SetNelconv = "01" and SetFs = "00"). In this case, using Table 18,
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 illustrates the classic trade-off between resolution and conversion time.
Table 17. Resolution1 vs. SetOsr and SetNelconv settings
1.
In shaded area, the resolution is truncated to 16 bits due to output register size RegA-
COut[15:0]
SetOsr
control bits
SetNelconv control bits
‘00‘
‘01‘
‘10‘
‘11’
‘000‘
6789
‘001‘
8910
11
‘010‘
10
11
12
13
‘011‘
12
13
14
15
‘100‘
14
15
16
‘101‘
16
‘110‘
16
‘111‘
16
Equation 17
Table 18. Normalized conversion time (Tconv x fs) vs. SetOsr and SetNelconv settings1
SetOsr bits
OSR
SetNelconv control bits
NELCONV
‘00‘
1
‘01‘
2
‘10‘
4
‘11‘
8
‘000‘
10
19
37
73
‘001‘
18
35
69
137
‘010‘
34
67
133
265
‘011‘
66
131
261
521
]
[
/
)
1
)
1
(
s
f
OSR
N
T
S
ELCONV
CONV
+
=
Recommended
for
New
Designs
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