If the FO pin is driven by an external oscillator of frequenc" />
參數(shù)資料
型號： LTC2431IMS#TRPBF
廠商： Linear Technology
文件頁數(shù)： 24/40頁
文件大?。?/td> 0K
描述： IC ADC 20BIT DIFFINPUT/REF10MSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 20
采樣率（每秒）： 7.5
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 2
功率耗散（最大）： 1mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類型： 1 個差分，雙極
配用： DC586A-ND - BOARD DELTA SIGMA ADC LTC2431
LTC2430/LTC2431
30
24301f
If the FO pin is driven by an external oscillator of frequency
fEOSC, Figure 29 can still be used for noise calculation if the
x-axis is scaled by fEOSC/153600. For large values of the
ratio fEOSC/153600, the Figure 29 plot accuracy begins to
decrease, but in the same time the LTC2430/LTC2431
noise floor rises and the noise contribution of the driving
amplifiers lose significance.
Normal Mode Rejection and Antialiasing
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2430/LTC2431 signifi-
cantly simplifies antialiasing filter requirements.
The sinc4 digital filter provides greater than 120dB normal
mode rejection at all frequencies except DC and integer
multiples of the modulator sampling frequency (fS). The
LTC2430/LTC2431’s autocalibration circuits further sim-
plify the antialiasing requirements by additional normal
mode signal filtering both in the analog and digital domain.
Independent of the operating mode, fS = 256 fN = 2048
fOUTMAX where fN is the notch frequency and fOUTMAX is
the maximum output data rate. In the internal oscillator
mode, fS = 12,800Hz with a 50Hz notch setting and fS =
15,360Hz with a 60Hz notch setting. In the external
oscillator mode, fS = fEOSC/10.
The combined normal mode rejection performance is
shown in Figure 30 for the internal oscillator with 50Hz
notch setting (FO = HIGH) and in Figure 31 for the internal
oscillator with FO = LOW and for the external oscillator
mode. The regions of low rejection occurring at integer
multiples of fS have a very narrow bandwidth. Magnified
details of the normal mode rejection curves are shown in
Figure 32 (rejection near DC) and Figure 33 (rejection at
fS = 256fN) where fN represents the notch frequency.
These curves have been derived for the external oscillator
mode but they can be used in all operating modes by
appropriately selecting the fN value.
The user can expect to achieve in practice this level of
performance using the internal oscillator as it is demon-
strated by Figures 34 to 36. Typical measured values of the
normal mode rejection of the LTC2430/LTC2431 operat-
ing with an internal oscillator and a 60Hz notch setting are
shown in Figure 34 superimposed over the theoretical
calculated curve. Similarly, typical measured values of the
normal mode rejection of the LTC2430/LTC2431 operat-
ing with an internal oscillator and a 50Hz notch setting are
shown in Figure 35 superimposed over the theoretical
calculated curve.
As a result of these remarkable normal mode specifica-
tions, minimal (if any) antialias filtering is required in front
of the LTC2430/LTC2431. If passive RC components are
placed in front of the LTC2430/LTC2431, the input dy-
namic current should be considered (see Input Current
section). In cases where large effective RC time constants
are used, an external buffer amplifier may be required to
minimize the effects of dynamic input current.
APPLICATIO S I FOR ATIO
WU
UU
Figure 30. Input Normal Mode Rejection,
Internal Oscillator and 50Hz Notch
Figure 31. Input Normal Mode Rejection, Internal
Oscillator and FO = LOW or External Oscillator
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS 2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS10fS11fS12fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2431 F30
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
FO = HIGH
FO = LOW OR
FO = EXTERNAL OSCILLATOR,
fEOSC = 10 fS
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
0fS
INPUT
NORMAL
MODE
REJECTION
(dB)
2431 F31
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
2fS 3fS 4fS 5fS 6fS 7fS 8fS 9fS 10fS
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