sx8725c Semtech Corporation, sx8725c Datasheet - Page 30

• Manufacturer Part Number: sx8725c
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.01
© Semtech
As already mentioned, N
7.7.5 Resolution
The theoretical resolution of the ADC, without considering thermal noise, is given by:
Using look-up
because of 16-bit register use for the ADC output, practical resolution is limited to 16 bits, i.e. n = 16. Even if the
ADVANCED COMMUNICATIONS & SENSING
Table 17
or the graph plotted in
ELCONV
16.0
14.0
12.0
10.0
January 2011
8.0
6.0
4.0
000
SetOsr[2:0]
(RegACCfg[4:2])
00
01
10
11
must be equal or greater than 2 to reduce internal amplifier offsets.
Figure 15. Resolution vs. SetOsr[2:0] and SetNelconv[2:0]
Table 16. Number of elementary conversion
001
n
=
2
⋅
SetNelconv[1:0]
log
010
Figure
2
(
OSR
11
10
01
00
Equation 16
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011
15, resolution can be set between 6 and 16 bits. Notice that,
)
SetOsr[2:0]
+
log
# of Elementary Conversion
N
1
2
4
8
ELCONV
2
(
100
N
ELCONV
ZoomingADC for sensing data acquisition
[-]
)
101
[
bit
]
110
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111
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