參數(shù)資料
型號(hào)： LTC2411CMS
英文描述： Analog-to-Digital Converter， 24-Bit
中文描述： 模擬到數(shù)字轉(zhuǎn)換器，24比特
文件頁數(shù)： 26/40頁
文件大小： 450K
代理商： LTC2411CMS
LTC2411
32
APPLICATIO S I FOR ATIO
WU
UU
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 F36
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
FO = GND
TA = 25°C
VIN(P-P) = 5V
VIN(P-P) = 7.5V
(150% OF FULL SCALE)
Figure 36. Measured Input Normal Mode Rejection vs Input Frequency
INPUT FREQUENCY (Hz)
0
NORMAL
MODE
REJECTION
(dB)
2411 F37
0
–20
–40
–60
–80
–100
–120
VCC = 5V
VREF = 5V
VINCM = 2.5V
FO = 5V
TA = 25°C
VIN(P-P) = 5V
VIN(P-P) = 7.5V
(150% OF FULL SCALE)
25
50
75
100
125
150
175
200
Figure 37. Measured Input Normal Mode Rejection vs Input Frequency
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. If passive RC components are placed in
front of the LTC2411, 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 third order
modulator resolves this problem and guarantees a pre-
dictable stable behavior at input signal levels of up to 150%
of full scale. In many industrial applications, it is not un-
common to have to measure microvolt level signals
superimposed over volt level perturbations and LTC2411
is eminently suited for such tasks. When the perturbation
is differential, the specification of interest is the normal
mode rejection for large input signal levels. With a refer-
ence voltage VREF = 5V, the LTC2411 has a full-scale dif-
ferential input range of 5V peak-to-peak. Figures 36 and
37 show measurement results for the LTC2411 normal
mode rejection ratio with a 7.5V peak-to-peak (150% of
full scale) input signal superimposed over the more
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