sx8725 Semtech Corporation, sx8725 Datasheet - Page 23

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

ADVANCED COMMUNICATIONS & SENSING
Over-Sampling Ratio
The over-sampling ratio (OSR) defines the number of integration cycles per elementary conversion. Its value is
set with the word SET_OSR[2:0] in power of 2 steps (see Table 11) given by:
Elementary Conversions
As mentioned previously, the whole conversion sequence is made of a set of N
conversions. This number is set with the word SET_NELC[1:0] in power of 2 steps (see Table 12) given by:
As already mentioned, N
V1.5 © 2007 Semtech Corp.
ELCONV
Table 12 - Number of Elementary Conversion Settings
must be equal or greater than 2 to reduce internal amplifier offsets.
Table 11 - Over-Sampling Ratio Settings
(RegACCfg0[4:2])
(RegACCfg0[6:5])
SET_NELC[1:0]
SET_OSR[2:0]
ZoomingADC™ for Pressure and Temperature Sensing
000
001
010
011
100
101
110
111
00
01
10
11
N
OSR
ELCONV
Equation 13
Equation 14
2
23
3
2
SET
SET
Over-Sampling Ratio
_
# of Elementary
_
OSR
NELC
Conversions
N
OSR (-)
2
ELCONV
0 :
1024
1
128
256
512
0 :
16
32
64
8
1
2
4
8
(-)
ELCONV
elementary incremental
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SX8725