SX8724C Datasheet, PDF (29/67 Pages) Semtech Corporation – ZoomingADC for sensing data acquisition

SX8724C
ZoomingADC for sensing data acquisition
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
7.7.2 Over-Sampling Frequency (fs)
The word SetFs[1:0] (see Table 14) is used to select the over-sampling frequency fs. The over-sampling frequency is
derived from the 4MHz oscillator clock.
Table 14. Sampling frequency settings
SetFs bitfield
(RegACCfg2[7:6])
00
01
10
11
Over-Sampling Frequency fs
[Hz]
62.5 kHz
125 kHz
250 kHz
500 kHz
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 Table 15) given by:
OSR = 2^{3+SetOsr[2:0]} [−]
Equation 14
Table 15. Over-sampling ratio settings
SetOsr[2:0]
(RegACCfg[4:2])
000
001
010
011
100
101
110
111
Over-Sampling Ratio
OSR [-]
8
16
32
64
128
256
512
1024
7.7.4 Number of Elementary Conversions (Nelconv)
As mentioned previously, the whole conversion sequence is made of a set of NELCONV elementary incremental
conversions. This number is set with the word SetNelconv[1:0] in power of 2 steps (see Table 16) given by:
N = 2 _ELCONV
SetNelconv [1:0]
[−]
Equation 15
Revision 1.01
© Semtech
January 2011
Page 29
www.semtech.com/products/