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参数资料
| 型号： | LTC2451CTS8B#TRMPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | ADC |
| 英文描述： | 1-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN |
| 文件页数： | 6/18页 |
| 文件大小： | 245K |
| 代理商： | LTC2451CTS8B#TRMPBF |
LTC2451
14
2451ff
Figure 14. LTC2451 Input Signal Attentuation vs Frequency
Figure 15. LTC2451 Input Signal Attenuation
vs Frequency (Low Frequencies)
traces. Actual applications include current measurements
through low value sense resistors, temperature measure-
ments, low impedance voltage source monitoring, and so
on. The resultant INL versus VIN is shown in Figure 13.
The measurements of Figure 13 include a capacitor CPAR
corresponding to a minimum sized layout pad and a
minimum width input trace of about 1" length.
Signal Bandwidth and Noise Equivalent Input
Bandwidth
The LTC2451 includes a sinc1 type digital lter with the rst
notch located at f0 = 60Hz. As such, the 3dB input signal
bandwidth is 26.54Hz. The calculated LTC2451 input signal
attenuation versus frequency over a wide frequency range
is shown in Figure 14. The calculated LTC2451 input signal
attenuation with low frequencies is shown in Figure 15.
The converter noise level is about 1.4μVRMS, 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 input drive
circuit can be modeled as a single-pole equivalent circuit
characterized by a pole location, fi, and a noise spectral
density, ni. If the converter has an unlimited bandwidth,
or at least a bandwidth substantially larger than fi, then
the total noise contribution of the external drive circuit
would be:
Vn
f
ni
i
=
π /
2
The total system noise level can then be estimated as
the square root of the sum of (Vn2) and the square of the
LTC2451 noise oor (~2μV2).
APPLICATIONS INFORMATION
TYPICAL APPLICATIONS
INPUT
SIGNAL
A
TTENUA
TION
(dB)
–40
0
2451 F14
–60
–80
–20
–100
INPUT SIGNAL FREQUENCY (MHz)
0
1.00
1.25
1.50
2.5
5.0
7.5
INPUT SIGNAL FREQUENCY (Hz)
0
INPUT
SIGNAL
A
TTENUA
TIOIN
(dB)
–20
–10
0
480
2451 F15
–30
–40
–25
–15
–5
–35
–45
–50
120
60
240
180
360 420
540
300
600
Easy Passive Input
Easy Active Input
LTC2451
100nF
PRECONDITIONED SENSOR
WITH VOLTAGE OUTPUT
1k
V+
GND
VOUT
2451 TA02
LTC2451
100nF
RS < 1k
2451 TA03
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