The SINC4 digital lter provides excellent no" />
參數(shù)資料
型號： DC1009A-A
廠商： Linear Technology
文件頁數(shù)： 24/36頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2492
軟件下載： QuikEval System
設(shè)計資源： DC1009A Design File
DC1009A Schematic
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 24
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2492
已供物品： 板
相關(guān)產(chǎn)品： LTC2492CDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2492IDE#TRPBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2492IDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2492CDE#PBF-ND - IC ADC 24BIT DELTA SIG 14-DFN
LTC2492
30
2492fd
APPLICATIONS INFORMATION
The SINC4 digital lter provides excellent normal mode
rejection at all frequencies except DC and integer multiples
of the modulator sampling frequency (fS) (see Figures
18 and 19). The modulator sampling frequency is fS =
15,360Hz while operating with its internal oscillator and
fS = FEOSC/20 when operating with an external oscillator
of frequency FEOSC.
When using the internal oscillator, the LTC2492 is designed
to reject line frequencies. As shown in Figure 20, rejection
nulls occur at multiples of frequency fN, where fN is
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2492 F18
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
Figure 18. Input Normal Mode Rejection, Internal Oscillator
and 50Hz Rejection Mode
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2492 F19
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
Figure 19. Input Normal Mode Rejection, Internal Oscillator
and 60Hz Rejection Mode
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2492 F20
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
fN = fEOSC/5120
Figure 20. Input Normal Mode Rejection at DC
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2492 F21
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
Figure 21. Input Normal Mode Rejection at fS = 256 fN
determined by the input control bits FA and FB (fN = 50Hz
or 60Hz or 55Hz for simultaneous rejection). Multiples of
the modulator sampling rate (fS = fN 256) only reject noise
to 15dB (see Figure 21); if noise sources are present at
these frequencies anti-aliasing will reduce their effects.
The user can expect to achieve this level of performance
using the internal oscillator, as shown in Figures 22, 23,
and 24. Measured values of normal mode rejection are
shown superimposed over the theoretical values in all
three rejection modes.
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