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參數(shù)資料
| 型號： | LTC2485 |
| 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> | 212K |
| 代理商： | LTC2485 |
LTC2450-1
17
24501fb
APPLICATIONS INFORMATION
Signal Bandwidth and Noise Equivalent Input
Bandwidth
The LTC2450-1 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 LTC2450-1
input signal attenuation with frequency at low frequencies
is shown in Figure 18.
The LTC2450-1 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
√
π
/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 LTC2450-1 noise floor (≈2
μ
V
2
).
Aliasing
The LTC2450-1 signal acquisition circuit is a sampled
data system and as such suffers from input signal alias-
ing. As can be seen from Figure 19, due to the very high
over-sample ratios the high frequency input signal attenu-
ation 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
τ
= R
S
C
IN
> 450ns.
Figure 18. Input Signal Attenuation vs Frequency
(Low Frequencies)
Figure 19. Input Signal Attenuation vs Frequency
INPUT SIGNAL FREQUENCY (Hz)
0
I
–20
–10
0
480
24501 F18
–30
–40
–25
–15
–5
–35
–45
–50
120
60
240
180
360 420
540
300
600
INPUT SIGNAL FREQUENCY (MHz)
0
I
–40
0
10.0
12.5
15.0
24501 F19
–60
–80
–20
–100
2.5
5.0
7.5
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