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參數(shù)資料
| 型號： | LTUX |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 1-/2-Channel 20-Bit UPower No Latency ADCs in MSOP-10 |
| 中文描述： | 1-/2-Channel 20位ADC的無延遲UPower采用MSOP - 10 |
| 文件頁數(shù)： | 23/32頁 |
| 文件大?。?/td> | 375K |
| 代理商： | LTUX |
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23
LTC2421/LTC2422
24212f
Input Current (V
IN
)
If complete settling occurs on the input, conversion re-
sults will be uneffected by the dynamic input current. If the
settling is incomplete, it does not degrade the linearity
performance of the device. It simply results in an offset/
full-scale shift, see Figure 17. To simplify the analysis of
input dynamic current, two separate cases are assumed:
large capacitance at V
IN
(C
IN
> 0.01
μ
F) and small capaci-
tance at V
IN
(C
IN
< 0.01
μ
F).
If the total capacitance at V
IN
(see Figure 18) is small
(<0.01
μ
F), relatively large external source resistances (up
to 80k for 20pF parasitic capacitance) can be tolerated
without any offset/full-scale error. Figures 19 and 20 show
a family of offset and full-scale error curves for various
small valued input capacitors (C
IN
< 0.01
μ
F) as a function
of input source resistance.
For large input capacitor values (C
IN
> 0.01
μ
F), the input
spikes are averaged by the capacitor into a DC current. The
gain shift becomes a linear function of input source resis-
tance independent of input capacitance, see Figures 21
and 22. The equivalent input impedance is 16.6M
. This
results in
±
150nA of input dynamic current at the extreme
values of V
IN
(V
IN
= 0V and V
IN
= V
REF
, when V
REF
= 5V).
This corresponds to a 0.3ppm shift in offset and full-scale
readings for every 10
of input source resistance.
APPLICATIOU
W
U
U
Figure 18. An RC Network at V
IN
Figure 19. Offset vs R
SOURCE
(Small C)
Figure 17. Offset/Full-Scale Shift
ZS
SET
TUE
V
IN
24212 F17
FS
SET
C
IN
24212 F17
INTPUT
SIGNAL
SOURCE
R
SOURCE
V
IN
LTC2421/
LTC2422
C
PAR
R
SOURCE
(
)
1
O
30
40
50
10k
24212 F19
20
10
0
10
100
1k
100k
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
T
A
= 25
°
C
C
IN
= 100pF
C
IN
= 1000pF
C
IN
= 0pF
C
IN
= 0.01
μ
F
Figure 20. Offset vs R
SOURCE
(Large C)
Figure 21. Full-Scale Error vs R
SOURCE
(Large C)
R
SOURCE
(
)
0
25
30
35
600
800
24212 F20
20
15
200
400
1000
10
5
0
O
C
IN
= 22
μ
F
C
IN
= 10
μ
F
C
IN
= 1
μ
F
C
IN
= 0.1
μ
F
C
IN
= 0.01
μ
F
C
IN
= 0.001
μ
F
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
T
A
= 25
°
C
R
SOURCE
(
)
0
F
–20
–15
–10
600
1000
24212 F21
–25
–30
–35
200
400
800
–5
0
5
C
IN
= 22
μ
F
C
IN
= 10
μ
F
C
IN
= 1
μ
F
C
IN
= 0.1
μ
F
C
IN
= 0.01
μ
F
C
IN
= 0.001
μ
F
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
T
A
= 25
°
C
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