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參數(shù)資料
| 型號： | LT2435CGN#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 20-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 27/40頁 |
| 文件大小： | 458K |
| 代理商： | LT2435CGN#PBF |
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LTC2435/LTC2435-1
33
24351fb
Figure 35. Input Normal Mode Rejection
Figure 36. Input Normal Mode Rejection
Figure 37. LTC2435-1 Input Normal Mode Rejection
As a result of these remarkable normal mode specifica-
tions, minimal (if any) antialias filtering is required in front
of the LTC2435/LTC2435-1. If passive RC components
are placed in front of the LTC2435/LTC2435-1, 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 LTC2435/LTC2435-1
third order modulator resolves this problem and guaran-
tees a predictable stable behavior at input signal levels of
up to 150% of full scale. In many industrial applications,
it is not uncommon to have to measure microvolt level
signals superimposed over volt level perturbations and
LTC2435/LTC2435-1 are 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 VREF = 5V, the LTC2435/
LTC2435-1 have a full-scale differential input range of 5V
peak-to-peak. Figure 40 shows measurement results for
the LTC2435-1 normal mode rejection ratio with a 7.5V
peak-to-peak (150% of full scale) input signal superim-
posed over the more traditional normal mode rejection
ratio results obtained with a 5V peak-to-peak (full scale)
input signal. The same performance is obtained for the
LTC2435 with the frequency scaled to have the notch fre-
quency at 60Hz (FO = GND) or 50Hz (FO = VCC). It is clear
that the LTC2435/LTC2435-1 rejection performance is
maintained with no compromises in this extreme situa-
tion. When operating with large input signal levels, the
user must observe that such signals do not violate the
device absolute maximum ratings.
INPUT SIGNAL FREQUENCY (fN)
INPUT
NORMAL
REJECTION
(dB)
2435 F35
0
–20
–40
–60
–80
–100
–120
0
fN
2fN 3fN 4fN 5fN
6fN 7fN
8fN
INPUT SIGNAL FREQUENCY (fN)
INPUT
NORMAL
REJECTION
(dB)
2435 F36
0
–20
–40
–60
–80
–100
–120
250
248
252 254 256 258 260 262 264
DIFFERENTIAL INPUT SIGNAL FREQUENCY (Hz)
48
–70
–80
–90
–100
–110
–120
–130
–140
54
58
2435 F37
50
52
56
60
62
NORMAL
MODE
REJECTION
(dB)
NO AVERAGE
WITH
RUNNING
AVERAGE
APPLICATIO S I FOR ATIO
WU
U
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