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參數(shù)資料
| 型號： | LTC2418IGN |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 8-/16-Channel 24-Bit No Latency TM ADCs |
| 中文描述： | 16-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 29/48頁 |
| 文件大?。?/td> | 775K |
| 代理商： | LTC2418IGN |
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LTC2414/LTC2418
29
241418fa
values for C
REF
will deteriorate the converter offset and
gain performance without significant benefits of reference
filtering and the user is advised to avoid them.
Larger values of reference capacitors (C
REF
> 0.01
μ
F) may
be required as reference filters in certain configurations.
Such capacitors will average the reference sampling charge
and the external source resistance will see a quasi con-
stant reference differential impedance. When F
O
= LOW
(internal oscillator and 60Hz notch), the typical differential
reference resistance is 1.3M
which will generate a gain
error of approximately 0.38ppm for each ohm of source
resistance driving REF
+
or REF
–
. When F
O
= HIGH (internal
oscillator and 50Hz notch), the typical differential refer-
ence resistance is 1.56M
which will generate a gain error
APPLICATIOU
W
U
U
R
SOURCE
(
)
1
10
100
1k
10k
100k
+
R
)
2414/18 F18
0
–10
–20
–30
–40
–50
V
CC
= 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
= 0.001
μ
F
C
REF
= 100pF
C
REF
= 0pF
R
SOURCE
(
)
1
10
100
1k
10k
100k
–
R
)
2414/18 F19
50
40
30
20
10
0
V
= 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
= 0.001
μ
F
C
REF
= 100pF
C
REF
= 0pF
R
SOURCE
(
)
0 100 200 300 400 500 600 700 800 9001000
+
R
)
2414/18 F20
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
)
2414/18 F21
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
Figure 18. +FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
IN
)
Figure 19. –FS Error vs R
SOURCE
at REF
+
or REF
–
(Small C
IN
)
Figure 20. +FS Error vs R
SOURCE
at REF
+
and REF
–
(Large C
REF
)
Figure 21. –FS Error vs R
SOURCE
at REF
+
and REF
–
(Large C
REF
)
of approximately 0.32ppm for each ohm of source resis-
tance driving REF
+
or REF
–
. When F
O
is driven by an
external oscillator with a frequency f
EOSC
(external conver-
sion clock operation), the typical differential reference
resistance is 0.20 10
12
/f
EOSC
and each ohm of source
resistance driving REF
+
or REF
–
will result in
2.47 10
–6
f
EOSC
ppm gain error. The effect of the source
resistance on the two reference pins is additive with
respect to this gain error. The typical +FS and –FS errors
for various combinations of source resistance seen by the
REF
+
and REF
–
pins and external capacitance C
REF
con-
nected to these pins are shown in Figures 18, 19, 20
and 21.
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