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參數(shù)資料
| 型號： | LTC2450IDCTRPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Easy-to-Use, Ultra-Tiny 16-Bit ADC |
| 中文描述： | 易于使用，超微型16位ADC |
| 文件頁數(shù)： | 17/20頁 |
| 文件大?。?/td> | 628K |
| 代理商： | LTC2450IDCTRPBF |
LTC2450
2450fa
applications inForMation
Signal Bandwidth and Noise Equivalent Input
Bandwidth
The LTC2450 includes a sinc
1
type digital filter with the
first notch located at f
0
= 60Hz. As such the 3dB input
signal bandwidth is 26.54Hz. The calculated LTC2450
input signal attenuation with frequency at low frequencies
is shown in Figure 18.
The LTC2450 input signal attenuation with frequency over
a wide frequency range is shown in Figure 19.
The converter noise level is about 1.4μV
RMS
and can be
modeled by a white noise source connected at the input
of a noise free converter.
For a simple system noise analysis the V
IN
drive circuit can
be modeled as a single pole equivalent circuit character-
ized by a pole location F
i
and a noise spectral density n
i
.
If the converter has an unlimited bandwidth or at least
a bandwidth substantially larger than F
i
, then the total
noise contribution of the external drive circuit would be
V
n
= n
i
√
p
/2 F
i
. Then, the total system noise level can
be estimated as the square root of the sum of (V
n2
) and
the square of the LTC2450 noise floor (≈2
m
V
2
).
Aliasing
The LTC2450 signal acquisition circuit is a sampled data
system and as such suffers from input signal aliasing. As
can be seen from Figure 19, due to the very high over-
sample ratios the high frequency input signal attenuation
is reasonably good. Nevertheless a continuous time
antialiasing filter connected at the input will preserve
the converter accuracy when the input signal includes
undesirable high frequency components. The antialias-
ing function can be accomplished using the R
S
and C
IN
components shown in Figure 15 sized such that
t
= R
S
C
IN
> 450ns.
Figure 18. Input Signal Attenuation vs Frequency
(Low Frequencies)
Figure 19. Input Signal Attenuation vs Frequency
INPUT SIGNAL FREQUENCY (MHz)
0
I
–40
0
10.0
12.5
15.0
2450 F19
–60
–80
–20
–100
2.5
5.0
7.5
INPUT SIGNAL FREQUENCY (Hz)
0
I
–20
–10
0
480
2450 F18
–30
–40
–25
–15
–5
–35
–45
–50
120
60
240
180
360 420
540
300
600
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