參數資料
型號： DC1011A-A
廠商： Linear Technology
文件頁數： 26/38頁
文件大小： 0K
描述： BOARD DELTA SIGMA ADC LTC2498
軟件下載： QuikEval System
設計資源： DC1011A Schematic
DC1011A Design Files
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數量： 1
位數： 24
采樣率（每秒）： 7.5
數據接口： MICROWIRE?，串行，SPI?
已用 IC / 零件： LTC2498
已供物品： 板
相關產品： LTC2498HUHF#TRPBF-ND - IC ADC 24BIT 16CH DELTA 38-QFN
LTC2498HUHF#PBF-ND - IC ADC 24BIT 16CH DELTA 38-QFN
LTC2498IUHF#TRPBF-ND - IC ADC 24BIT 16CH 38-QFN
LTC2498CUHF#TRPBF-ND - IC ADC 24BIT 16CH 38-QFN
LTC2498IUHF#PBF-ND - IC ADC 24BIT 16CH 38-QFN
LTC2498CUHF#PBF-ND - IC ADC 24BIT 16CH 38-QFN
LTC2498
32
2498ff
Figure 23. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (60Hz Notch)
applications inForMation
noise to 15dB (see Figure 22), 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 23, 24,
and 25. Measured values of normal mode rejection are
shown superimposed over the theoretical values in all
three rejection modes.
Traditional high order delta-sigma modulators suffer
from potential instabilities at large input signal levels.
The proprietary architecture used for the LTC2498 third
order modulator resolves this problem and guarantees
stability with input signals 150% of full-scale. In many
industrial applications, it is not uncommon to have mi-
crovolt level signals superimposed over unwanted volt
level error sources with several volts of peak-to-peak
Figure 24. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz Notch)
Figure 21. Input Normal Mode Rejection at DC
Figure 22. Input Normal Mode Rejection at fS = 256 fN
Figure 25. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz/60Hz Notch)
INPUT FREQUENCY (Hz)
0
15
30
45
60
75
90 105 120 135 150 165 180 195 210 225 240
NORMAL
MODE
REJECTION
(dB)
2498 F23
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
VIN(P-P) = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
INPUT FREQUENCY (Hz)
0 12.5 25 37.5 50 62.5 75 87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
NORMAL
MODE
REJECTION
(dB)
2498 F24
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
VIN(P-P) = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
INPUT FREQUENCY (Hz)
0
20
40
60
80
100
120
140
160
180
200
220
NORMAL
MODE
REJECTION
(dB)
2498 F25
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VIN(CM) = 2.5V
VIN(P-P) = 5V
TA = 25°C
MEASURED DATA
CALCULATED DATA
INPUT SIGNAL FREQUENCY (Hz)
INPUT
NORMAL
MODE
REJECTION
(dB)
2498 F21
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
INPUT SIGNAL FREQUENCY (Hz)
250fN 252fN 254fN 256fN 258fN 260fN 262fN
INPUT
NORMAL
MODE
REJECTION
(dB)
2498 F22
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
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