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參數(shù)資料
| 型號： | LTC2420 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower 20-bit ADC(微功耗，20位串行模數(shù)轉換器) |
| 中文描述： | 微功耗20位ADC（微功耗，20位串行模數(shù)轉換器） |
| 文件頁數(shù)： | 24/36頁 |
| 文件大小： | 388K |
| 代理商： | LTC2420 |
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24
LTC2420
APPLICATIU
W
U
U
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
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.
In addition to the input current spikes, the input ESD
protection diodes have a temperature dependent leakage
current. This leakage current, nominally 1nA (
±
10nA
max), results in a fixed offset shift of 10
μ
V for a 10k source
resistance.
R
SOURCE
(
)
1
O
30
40
50
10k
2420 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 19. Offset vs R
SOURCE
(Small C)
Figure 20. Full-Scale Error vs R
SOURCE
(Small C)
Reference Current (V
REF
)
Similar to the analog input, the reference input has a
dynamic input current. This current has negligible effect
on the offset. However, the reference current at V
IN
= V
REF
is similar to the input current at full-scale. For large values
of reference capacitance (C
VREF
> 0.01
μ
F), the full-scale
error shift is 0.03ppm/
of external reference resistance
independent of the capacitance at V
REF
, see Figure 23. If
the capacitance tied to V
REF
is small (C
VREF
< 0.01
μ
F), an
input resistance of up to 80k (20pF parasitic capacitance
at V
REF
) may be tolerated, see Figure 24.
Unlike the analog input, the integral nonlinearity of the
device can be degraded with excessive external RC time
constants tied to the reference input. If the capacitance at
R
SOURCE
(
)
0
25
30
35
600
800
2420 F21
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
2420 F22
–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
Figure 21. Offset vs R
SOURCE
(Large C)
Figure 22. Full-Scale Error vs R
SOURCE
(Large C)
R
SOURCE
(
)
1
–50
F
–40
–30
–20
–10
0
10
10
100
1k
10k
2420 F20
100k
V
CC
= 5V
V
REF
= 5V
V
IN
= 5V
T
A
= 25
°
C
C
IN
= 0.01
μ
F
C
IN
= 100pF
C
IN
= 1000pF
C
= 0pF
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