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參數(shù)資料
| 型號： | LTC2413IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 24-Bit No Latency ADC, with Simultaneous 50Hz/60Hz Rejection |
| 中文描述： | 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 28/44頁 |
| 文件大小： | 454K |
| 代理商： | LTC2413IGN |
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LTC2413
28
sn2413 2413fs
APPLICATIU
W
U
U
Figure27 shows the typical INL error due to the source
resistance driving the REF
+
or REF
–
pins when large C
REF
values are used. The effect of the source resistance on the
two reference pins is additive with respect to this INL error.
In general, matching of source impedance for the REF
+
and REF
–
pins does not help the gain or the INL error. The
user is thus advised to minimize the combined source
impedance driving the REF
+
and REF
–
pins rather than to
try to match it.
The magnitude of the dynamic reference current depends
upon the size of the very stable internal sampling capaci-
tors and upon the accuracy of the converter sampling
clock. The accuracy of the internal clock over the entire
temperature and power supply range is typical better than
0.5%. Such a specification can also be easily achieved by
an external clock. When relatively stable resistors
(50ppm/
°
C) are used for the external source impedance
seen by REF
+
and REF
–
, the expected drift of the dynamic
current gain error will be insignificant (about 1% of its
value over the entire temperature and voltage range). Even
for the most stringent applications, a one-time calibration
operation may be sufficient.
In addition to the reference sampling charge, the reference
pins ESD protection diodes have a temperature dependent
leakage current. This leakage current, nominally 1nA
(
±
10nA max), results in a small gain error. A 100
source
resistance will create a 0.05
μ
V typical and 0.5
μ
V maxi-
mum full-scale error.
Figure 23. +FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
REF
)
Figure 24. –FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
REF
)
Figure 25. +FS Error vs R
SOURCE
at REF
+
or REF
–
(Large C
REF
)
Figure 26. –FS Error vs R
SOURCE
at REF
+
or REF
–
(Large C
REF
)
R
SOURCE
(
)
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
+
R
)
2413 F23
0
–10
–20
–30
–40
–50
V
= 5V
REF
+
= 5V
REF
–
= GND
IN
+
= 5V
IN
–
= 2.5V
F
O
= GND
T
A
= 25
°
C
C
REF
= 0.01
μ
F
C
REF
= 0.001
μ
F
C
REF
= 100pF
C
REF
= 0pF
R
SOURCE
(
)
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
–
R
)
2413 F24
50
40
30
20
10
0
V
CC
= 5V
REF
+
= 5V
REF
–
= GND
IN
+
= GND
IN
–
= 2.5V
F
O
= GND
T
A
= 25
°
C
C
REF
= 0.01
μ
F
C
REF
= 0.001
μ
F
C
REF
= 100pF
C
REF
= 0pF
R
SOURCE
(
)
0 100 200 300 400 500 600 700 800 9001000
+
R
)
2413 F25
0
–90
–180
–270
–360
–450
V
= 5V
REF
= 5V
REF
–
= GND
IN
+
= 3.75V
IN
–
= 1.25V
F
O
= GND
T
A
= 25
°
C
C
REF
= 0.01
μ
F
C
REF
= 0.1
μ
F
C
REF
= 1
μ
F, 10
μ
F
R
SOURCE
(
)
0 100 200 300 400 500 600 700 800 9001000
–
R
)
2413 F26
450
360
270
180
90
0
V
CC
= 5V
REF
+
= 5V
REF
–
= GND
IN
+
= 1.25V
IN
–
= 3.75V
F
O
= GND
T
A
= 25
°
C
C
REF
= 0.01
μ
F
C
REF
= 0.1
μ
F
C
REF
= 1
μ
F, 10
μ
F
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