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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 32/53頁 |
| 文件大?。?/td> | 3966K |
| 代理商： | SX8725E083TRT |
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ADVANCED COMMUNICATIONS & SENSING
V1.8 2009 Semtech Corp.
www.semtech.com
38
SX8725
ZoomingADC for Pressure and Temperature Sensing
Frequency Response
The incremental ADC is an over-sampled converter with two main blocks: an analog modulator and a low-pass
digital filter. The main function of the digital filter is to remove the quantization noise introduced by the
modulator. This filter determines the frequency response of the transfer function between the output of the ADC
and the analog input VIN. Notice that the frequency axes are normalized to one elementary conversion period
OSR / fs. The plots of Figure 21 also show that the frequency response changes with the number of elementary
conversions NELCONV performed. In particular, notches appear for NELCONV
≥ 2. These notches occur at:
ELCONV
s
NOTCH
N
OSR
f
i
f
=
)
(
(Hz) for
)
1
(
,...,
2
,
1
=
ELCONV
N
i
Equation 24
and are repeated every fs / OSR.
Information on the location of these notches is particularly useful when specific frequencies must be filtered out
by the acquisition system. This chip has no dedicated 50/60 Hz rejection filtering but some rejection can be
achieved by using Equation 24 and setting the appropriate values of OSR, fs and NELCONV.
Examples:
Rejection [Hz]
fNOTCH [Hz]
fs [kHz]
OSR [-]
NELCONV [-]
61
125
1024
2
61
250
1024
4
60
61
500
1024
8
53
62.5
1024
8
46
62.5
1024
4
50
46
125
1024
8
Table 32 - 60/50 Hz Line Rejection Examples
Figure 21 - Frequency Response: Normalized Magnitude vs. Frequency for Different NELCONV
0
0.2
0.4
0.6
0.8
1
1.2
0
1
2
3
4
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
a
li
z
e
d
M
a
g
n
it
u
d
e
[-
]
NELCONV = 1
0
0.2
0.4
0.6
0.8
1
1.2
0
1
2
3
4
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
a
li
z
e
d
M
a
g
n
it
u
d
e
[-
]
NELCONV = 2
0
0.2
0.4
0.6
0.8
1
1.2
0
1
2
3
4
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
a
li
z
e
d
M
a
g
n
it
u
d
e
[-
]
NELCONV = 4
0
0.2
0.4
0.6
0.8
1
1.2
0
1
2
3
4
Normalized Frequency - f *(OSR/fS) [-]
N
o
rm
a
li
z
e
d
M
a
g
n
it
u
d
e
[-
]
NELCONV = 8
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