參數(shù)資料
型號(hào)： LTC2480IDD
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 16-Bit ADC with Easy Drive
中文描述： 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO10
封裝： 3 X 3 MM, PLASTIC, MO-229WEED-2, DFN-10
文件頁數(shù)： 35/40頁
文件大?。?/td> 535K
代理商： LTC2480IDD
35
LTC2480
2480f
APPLICATIU
W
U
U
Figure 34. Input Normal Mode Rejection vs Input Frequency
with Input Perturbation of 100% Full Scale (60Hz Notch)
Figure 35. Input Normal Mode Rejection vs Input Frequency
with Input Perturbation of 100% Full Scale (50Hz Notch)
Figure 36. Input Normal Mode Rejection vs Input Frequency
with Input Perturbation of 100% Full Scale (50Hz/60Hz Mode)
INPUT FREQUENCY (Hz)
0
15
30
45
60
75
90
105 120 135 150 165 180 195 210 225 240
N
2480 F34
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
12.5
25
37.5
50
62.5
75
87.5 100 112.5 125 137.5 150 162.5 175 187.5 200
N
2480 F35
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
20
40
60
80
100
120
140
160
180
200
220
N
2483 F36
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
As a result of these remarkable normal mode specifica-
tions, minimal (if any) antialias filtering is required in front
of the LTC2480. If passive RC components are placed in
front of the LTC2480, the input dynamic current should be
considered (see Input Current section). In this case, the
differential input current cancellation feature of the LTC2480
allows external RC networks without significant degrada-
tion in DC performance.
Traditional high order delta-sigma modulators, while pro-
viding very good linearity and resolution, suffer from po-
tential instabilities at large input signal levels. The
proprietary architecture used for the LTC2480 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 super-
imposed over volt level perturbations and the LTC2480 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 reference
voltage V
REF
= 5V, the LTC2480 has a full-scale differen-
tial input range of 5V peak-to-peak. Figures 37 and 38
show measurement results for the LTC2480 normal mode
rejection ratio with a 7.5V peak-to-peak (150% of full scale)
input signal superimposed over the more traditional nor-
mal mode rejection ratio results obtained with a 5V peak-
to-peak (full scale) input signal. In Figure 37, the LTC2480
uses the internal oscillator with the notch set at 60Hz (F
O
= LOW) and in Figure 38 it uses the internal oscillator with
the notch set at 50Hz. It is clear that the LTC2480 rejection
performance is maintained with no compromises in this
extreme situation. When operating with large input signal
levels, the user must observe that such signals do not
violate the device absolute maximum ratings.
Using the 2x speed mode of the LTC2480, the device
bypasses the digital offset calibration operation to double
the output data rate. The superior normal mode rejection
is maintained as shown in Figures 30 and 31. However, the
magnified details near DC and f
S
= 256f
N
are different, see
Figures 39 and 40. In 2x speed mode, the bandwidth is
11.4Hz for the 50Hz rejection mode, 13.6Hz for the 60Hz
rejection mode and 12.4Hz for the 50Hz/60Hz rejection
superimposed over the theoretical calculated curve. Simi-
larly, the measured normal mode rejection of the LTC2480
for the 50Hz rejection mode and 50Hz/60Hz rejection mode
are shown in Figures 35 and 36.
相關(guān)PDF資料
PDF描述
LTC2480CDD 16-Bit ADC with Easy Drive
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