SX8723 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8723' PDF : 53 Pages View PDF
SX8723
ZoomingADC™ for Pressure and Temperature Sensing
ADVANCED COMMUNICATIONS & SENSING
Conversion Time and Throughput
As explained in Figure 12, conversion time is given by:
( ) TCONV
=
N ELCONV
⋅
OSR +1
fs
+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_OSR
[2:0]
000
001
010
011
100
101
110
111
00
10
18
34
66
130
258
514
1026
SET_NELC[1:0]
01
10
19
37
35
69
67
133
131
261
259
517
515
1029
1027
2053
2051
4101
11
73
137
265
521
1033
2057
4105
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)
16.0
14.0
12.0
10.0
SET_NELC
8.0
11
10
6.0
01
00
4.0
10.0
100.0
1000.0
10000.0
Normalized Conversion Time - TCONV*fS [-]
Figure 13 - Resolution vs. Normalized Conversion Time for Different SET_NELC[1:0]
V1.5 © 2007 Semtech Corp.
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