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參數(shù)資料
| 型號(hào)： | LTC2400CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 24-Bit uPower No Latency ADC in SO-8 |
| 中文描述： | 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 23/40頁(yè) |
| 文件大小： | 455K |
| 代理商： | LTC2400CS8 |
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23
LTC2400
APPLICATIO
S I
N
FOR
ATIO
U
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 16. 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).
W
U
C
IN
2400 F17
INTPUT
SIGNAL
SOURCE
R
SOURCE
V
IN
LTC2400
C
PAR
Figure 17. An RC Network at V
IN
R
SOURCE
(
)
1
O
30
40
50
10k
2400 F18
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 18. Offset vs R
SOURCE
(Small C)
R
SOURCE
(
)
1
F
–20
–10
0
10k
2400 F19
–30
–40
–50
10
100
1k
100k
V
CC
= 5V
V
REF
= 5V
V
IN
= 5V
T
A
= 25
°
C
C
IN
= 0pF
C
IN
= 100pF
C
IN
= 1000pF
C
IN
= 0.01
μ
F
Figure 19. Full-Scale Error vs R
SOURCE
(Small C)
R
SOURCE
(
)
0
O
100
200
300
50
150
250
200
400
600
800
2400 F20
1000
100
0
300
500
700
900
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
T
A
= 25
°
C
C
IN
= 1
μ
F
C
IN
= 10
μ
F
C
IN
= 0.1
μ
F
C
IN
= 0.01
μ
F
Figure 20. Offset vs R
SOURCE
(Large C)
0
TUE
V
REF
/2
V
IN
2400 F16
V
REF
Figure 16. Offset/Full-Scale Shift
If the total capacitance at V
IN
(see Figure 17) is small
(<0.01
μ
F), relatively large external source resistances (up
to 20k for 20pF parasitic capacitance) can be tolerated
without any offset/full-scale error. Figures 18 and 19 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
resistance independent of input capacitance, see Figures
20 and 21. The equivalent input impedance is 1.66M
.
This results in
±
1.5
μ
A of input dynamic current at the
extreme values of V
IN
(V
IN
= 0V and V
IN
= V
REF
, when
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