sx8724s Semtech Corporation, sx8724s Datasheet - Page 26

• Manufacturer Part Number: sx8724s
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.0
© Semtech
7.7.2 Over-Sampling Frequency (fs)
The word SetFs[1:0] (see
derived from the 4MHz oscillator clock.
7.7.3 Over-Sampling Ratio (OSR)
The over-sampling ratio (OSR) defines the number of integration cycles per elementary conversion. Its value is set with
the word SetOsr[2:0] in power of 2 steps (see
7.7.4 Number of Elementary Conversions (Nelconv)
As mentioned previously, the whole conversion sequence is made of a set of N
conversions. This number is set with the word SetNelconv[1:0] in power of 2 steps (see
ADVANCED COMMUNICATIONS & SENSING
February 2011
Table
13) is used to select the over-sampling frequency fs. The over-sampling frequency is
(RegACCfg2[7:6])
(RegACCfg[4:2])
SetFs bit field
Table 13. Sampling frequency settings
Table 14. Over-sampling ratio settings
SetOsr[2:0]
000
001
010
011
100
101
110
111
00
01
10
11
Table
N
ELCONV
OSR
14) given by:
=
Equation 14
Equation 15
Page 26
=
2
2
3
+
SetNelconv
SetOsr[2
Over-Sampling Frequency fs
:
0]
Over-Sampling Ratio
: [1
ZoomingADC for sensing data acquisition
0]
[
−
]
[
62.5 kHz
125 kHz
250 kHz
500 kHz
OSR [-]
−
1024
[Hz]
128
256
512
16
32
64
]
8
ELCONV
elementary incremental
Table
15) given by:
SX8724S
www.semtech.com
DATASHEET