参数资料
型号: SX8725CWLTDT
元件分类: ADC
英文描述: 2-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL/PARALLEL ACCESS, PDSO12
封装: 4 X 4 MM, HALOGEN FREE AND ROHS COMPLIANT, MLPD-12
文件页数: 22/68页
文件大小: 1718K
代理商: SX8725CWLTDT
www.semtech.com/products/
Page 29
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
SX8725C
ZoomingADC for sensing data acquisition
Revision 1.01
January 2011
Semtech
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.
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:
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:
Table 14. Sampling frequency settings
SetFs bitfield
(RegACCfg2[7:6])
Over-Sampling Frequency fs
[Hz]
00
62.5 kHz
01
125 kHz
10
250 kHz
11
500 kHz
Equation 14
Table 15. Over-sampling ratio settings
SetOsr[2:0]
(RegACCfg[4:2])
Over-Sampling Ratio
OSR [-]
000
8
001
16
010
32
011
64
100
128
101
256
110
512
111
1024
Equation 15
]
[
2
0]
:
SetOsr[2
3
= +
OSR
]
[
2
0]
:
[1
SetNelconv
=
ELCONV
N
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