sx8725 Semtech Corporation, sx8725 Datasheet - Page 25

• Manufacturer Part Number: sx8725
• Description: Sx8725 Zoomingadc? For Pressure And Temperature Sensing
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
Conversion Time and Throughput
As explained in Figure 12, conversion time is given by:
and throughput is then simply 1/T
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.
V1.5 © 2007 Semtech Corp.
Table 14 - Normalized Conversion Time (T
Figure 13 - Resolution vs. Normalized Conversion Time for Different SET_NELC[1:0]
SET_OSR
(Normalized to Over-Sampling Period 1/f
T
[2:0]
CONV
000
001
010
011
100
101
110
111
CONV
16.0
14.0
12.0
10.0
8.0
6.0
4.0
10.0
. For example, consider an over-sampling ratio of 256, 2 elementary
ZoomingADC™ for Pressure and Temperature Sensing
00
Normalized Conversion Time - T
N
01
ELCONV
1026
130
258
514
00
10
18
34
66
10
Equation 16
100.0
11
25
CONV
OSR
f
SET_NELC
1027
2051
s
SET_NELC[1:0]
131
259
515
01
19
35
67
*f
s
) vs. SET_OSR[2:0] and SET_NELC[1:0]
1
1000.0
1029
2053
4101
133
261
517
10
37
69
1
CONV
*f
S
[-]
10000.0
1033
2057
4105
8201
137
265
521
(s)
11
73
s
)
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SX8725