參數(shù)資料
型號(hào)： SX8725E083TRT
元件分類： ADC
英文描述： 3-CH 16-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO12
封裝： 4 X 4 MM, ROHS COMPLIANT, MLPD-12
文件頁(yè)數(shù)： 17/53頁(yè)
文件大?。?/td> 3966K
代理商： SX8725E083TRT
ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
24
SX8725
ZoomingADC for Pressure and Temperature Sensing
Resolution
The theoretical resolution of the ADC, without considering thermal noise, is given by:
(
)
(
)
ELCONV
N
OSR
n
2
log
2
+
=
(Bits)
Equation 15
Figure 12 - Resolution vs. SET_OSR[2:0] and SET_NELC[1:0]
Using look-up Table 13 or the graph plotted in Figure 12, resolution can be set between 6 and 16 bits. Notice
that, because of 16-bit register use for the ADC output, practically the resolution is limited to 16 bits,
i.e. n
≤ 16. Even though the resolution is truncated to 16 bit by the output register size, it may make sense to set
OSR and NELCONV to higher values in order to reduce the influence of the thermal noise in the PGA and of
external noises (see section “PGA Gain & Offset, Linearity and Noise” in page 37).
SET_NELC[1:0]
SET_OSR
[2:0]
00
01
10
11
000
6
7
8
9
001
8
9
10
11
010
10
11
12
13
011
12
13
14
15
100
14
15
16
101
16
110
16
111
16
Note: shaded area: resolution truncated to 16 bits due to
output register size RegACOut[15:0]
Table 13 - Resolution vs. SET_OSR[2:0] and SET_NELC[1:0] Settings
5
7
9
11
13
15
17
000
001
010
011
100
101
110
111
SET_OSR
R
e
s
o
lu
ti
o
n
-
n
[B
it
s
]
11
10
01
00
SET_NELC=
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