參數資料
型號: LTC2411-1CMS#TRPBF
廠商: Linear Technology
文件頁數: 25/40頁
文件大?。?/td> 0K
描述: IC A/DCONV DIFF INPUT&REF 10MSOP
標準包裝: 2,500
位數: 24
采樣率(每秒): 6.8
數據接口: MICROWIRE?,串行,SPI?
轉換器數目: 2
功率耗散(最大): 1mW
電壓電源: 單電源
工作溫度: 0°C ~ 70°C
安裝類型: 表面貼裝
封裝/外殼: 10-TFSOP,10-MSOP(0.118",3.00mm 寬)
供應商設備封裝: 10-MSOP
包裝: 帶卷 (TR)
輸入數目和類型: 1 個差分,雙極
LTC2411/LTC2411-1
31
APPLICATIO S I FOR ATIO
WU
UU
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2411 F32
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
fN
0
2fN 3fN 4fN 5fN 6fN 7fN 8fN
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2411 F33
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
Figure 32. Input Normal Mode Rejection
Figure 33. Input Normal Mode Rejection
INPUT FREQUENCY (Hz)
0
15 30 45 60 75 90 105 120 135 150 165 180 195 210 225 240
NORMAL
MODE
REJECTION
(dB)
2411 F34
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
VIN(P-P) = 5V
FO = GND
TA = 25°C
MEASURED DATA
CALCULATED DATA
INPUT FREQUENCY (Hz)
0
25
50
75
100
125
150
175
200
NORMAL
MODE
REJECTION
(dB)
2411 F35
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
VIN(P-P) = 5V
FO = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
Figure 34. Input Normal Mode Rejection
vs Input Frequency (LTC2411)
Figure 35. Input Normal Mode Rejection
vs Input Frequency (LTC2411)
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 LTC2411 operating 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 LTC2411 operating 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 LTC2411/LTC2411-1. If passive RC components
are placed in front of the LTC2411/LTC2411-1, the input
dynamic 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.
Traditional high order delta-sigma modulators, while pro-
viding very good linearity and resolution, suffer from
potential instabilities at large input signal levels. The pro-
prietary architecture used for the LTC2411/LTC2411-1
third order modulator resolves this problem and guaran-
tees a predictable stable behavior at input signal levels of
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