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LTC1415CSW 데이터시트(PDF) 13 Page - Linear Technology

부품명 LTC1415CSW
상세설명  12-Bit, 1.25Msps, 55mW Sampling A/D Converter
PDF  24 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC1415CSW 데이터시트(HTML) 13 Page - Linear Technology

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13
LTC1415
APPLICATIONS INFORMATION
4.096V to 2.048V and shifts the common mode voltage
from half of full scale to 2.274V.
AC Coupled Inputs
The analog inputs can be AC coupled for applications
where the input has no DC information. The input of the
ADC does need to be DC biased at midscale. Figures 10d
and 10e demonstrate AC coupling and the required bias-
ing. Figure 10d shows the ADC with a full scale of 4.096V,
a common mode voltage of 2.048V and an input that
swings from 0V to 4.096V. This circuit has the lowest
noise (SINAD = 72dB to 100kHz) but will have distortion
INPUT FREQUENCY (Hz)
80
70
60
50
40
30
20
10
0
1k
100k
1M
2M
LTC1415 • F10a
10k
Figure 10a. CMRR vs Input Frequency
Figure 10b. Shifting the Input Range Up from Ground by 200mV
LTC1415
+AIN
ANALOG INPUT
1.25V TO 3.298V
–AIN
VREF
REFCOMP
AGND
LTC1415 • F10c
1
2
3
4
5
10
µF
24
Ω
1
µF
VOUT = 1.2V
LT1004-1.2
Figure 10c. 2.048V Input Range with a Common Mode
Voltage of 2.274V. For Low Distortion AC Applications
LTC1415
+AIN
ANALOG INPUT
4.096VP-P
–AIN
VREF
REFCOMP
AGND
LTC1415 • F10d
1
2
3
4
5
10
µF
2k
2k
Figure 10d. 4.096VP-P Input Range with AC Coupling.
For Low Noise AC Applications
LTC1415
+AIN
ANALOG INPUT
2.048VP-P
–AIN
VREF
REFCOMP
AGND
LTC1415 • F10e
1
2
3
4
5
10
µF
1
µF
25
Ω
1k
9k
1k
–
+
LT1004-1.2
Figure 10e. 2.048VP-P Input Range with AC Coupling. For Low Distortion AC Applications
LTC1415
+AIN
ANALOG INPUT
0.2V TO 4.296V
–AIN
VREF
REFCOMP
AGND
LTC1415 • F10b
1
2
3
4
5
10
µF
R2
3.9k
R1
200
Ω



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