參數(shù)資料
型號(hào)： XE8000EV121
廠商： Semtech
文件頁(yè)數(shù)： 32/53頁(yè)
文件大小： 0K
描述： BOARD EVAL FOR SX8723/24
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，傳感器至模數(shù)轉(zhuǎn)換器接口，可編程
嵌入式： 否
已用 IC / 零件： SX8723，SX8724，SX8725
主要屬性： 用于橋型傳感器的信號(hào)調(diào)節(jié)
次要屬性： GUI，最多 16 位，1/12 ~ 1000 可編程增益，I2C 接口
已供物品： 板，CD
產(chǎn)品目錄頁(yè)面： 585 (CN2011-ZH PDF)
相關(guān)產(chǎn)品： SX8725E083DKR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082DKR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083CT-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082CT-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
SX8725E083TR-ND - IC DAS PRESSURE/TEMP SENS 12MLPD
SX8724E082TR-ND - IC DAS PRESSURE/TEMP SENS 16MLPQ
ADVANCED COMMUNICATIONS & SENSING
V1.23 2009 Semtech Corp.
www.semtech.com
38
SX8724
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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