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參數(shù)資料
| 型號(hào)： | 2495 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 8-/16-Channel ツヒ ADC with PGA, Easy Drive and I2C Interface |
| 中文描述： | 16位8-/16-ChannelツヒADC，帶PGA巡回賽，輕松驅(qū)動(dòng)和I2C接口 |
| 文件頁數(shù)： | 28/32頁 |
| 文件大?。?/td> | 558K |
| 代理商： | 2495 |
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LTC2495
28
2495f
Figure 26. Measure Input Normal Mode Rejection vs Input
Frequency with Input Perturbation of 150% (50Hz Notch)
Figure 25. Measure Input Normal Mode Rejection vs Input
Frequency with Input Perturbation of 150% (60Hz Notch)
APPLICATIONS INFORMATION
Figure 24. Input Normal Mode Rejection vs Input Frequency with
Input Perturbation of 100% (50Hz/60Hz Notch)
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 LTC2495 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 error
sources with several volts if peak-to-peak noise. Figures
25 and 26 show measurement results for the rejection
of a 7.5V peak-to-peak noise source (150% of full scale)
applied to the LTC2495. These curves show that the rejec-
tion performance is maintained even in extremely noisy
environments.
INPUT FREQUENCY (Hz)
0
20
40
60
80
100
120
140
160
180
200
220
N
2495 F25
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
V
IN(P-P)
= 5V
T
A
°
C
MEASURED DATA
CALCULATED DATA
INPUT FREQUENCY (Hz)
0
15
30
45
60
75
90
105 120 135 150 165 180 195 210 225 240
N
2495 F26
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
T
A
°
C
V
IN(P-P)
= 5V
V
= 7.5V
(150% OF FULL SCALE)
INPUT FREQUENCY (Hz)
0
N
2495 F27
0
–20
–40
–60
–80
–100
–120
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
T
A
°
C
V
IN(P-P)
= 5V
V
= 7.5V
(150% OF FULL SCALE)
12.5
25
37.5
50
62.5
75
87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
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