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參數(shù)資料
| 型號： | LTC2486 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ツヒ ADC with PGA and Easy Drive Input Current Cancellation |
| 中文描述： | 16位2-/4-ChannelツヒADC，帶PGA和簡易輸入電流驅(qū)動取消 |
| 文件頁數(shù)： | 29/36頁 |
| 文件大?。?/td> | 596K |
| 代理商： | LTC2486 |
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LTC2486
29
2486f
APPLICATIONS INFORMATION
and reference bypass capacitance) linearity and gain errors
are introduced.
For relatively small values of external reference capacitance
(C
REF
< 1nF), the voltage on the sampling capacitor settles
for reference impedances of many k
Ω
(if C
REF
= 100pF up
to 10k
Ω
will not degrade the performance) (see Figures
13 and 14).
In cases where large bypass capacitors are required on
the reference inputs (C
REF
> 0.01μF) full-scale and linear-
ity errors are proportional to the value of the reference
resistance. Every ohm of reference resistance produces a
full-scale error of approximately 0.5ppm (while operating
in simultaneous 50Hz/60Hz mode) (see Figures 15 and 16).
If the input common mode voltage is equal to the reference
common mode voltage, a linearity error of approximately
0.67ppm per 100
Ω
of reference resistance results (see
Figure 17). In applications where the input and reference
common mode voltages are different, the errors increase.
Figure 13. +FS Error vs R
SOURCE
at V
REF
(Small C
REF
)
Figure 14. –FS Error vs R
SOURCE
at V
REF
(Small C
REF
)
R
SOURCE
(
)
0
+
50
70
90
10k
2486 F13
30
10
40
60
80
20
0
–10
10
100
1k
100k
V
CC
= 5V
V
= 5V
V
REF
= 3.75V
V
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
(
)
0
–
–30
–10
10
10k
2486 F14
–50
–70
–40
–20
0
–60
–80
–90
10
100
1k
100k
V
CC
= 5V
V
= 5V
V
REF
= 1.25V
V
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
Figure 15. +FS Error vs R
SOURCE
at V
REF
(Large C
REF
)
Figure 16. –FS Error vs R
SOURCE
at V
REF
(Large C
REF
)
R
SOURCE
(
)
0
+
300
400
500
800
2486 F15
200
100
0
200
400
600
1000
V
CC
= 5V
V
= 5V
V
REF
= 3.75V
V
IN–
= 1.25V
F
O
= GND
T
A
= 25
°
C
C
REF
= 1
μ
F, 10
μ
F
C
REF
= 0.1
μ
F
C
REF
= 0.01
μ
F
R
SOURCE
(
)
0
–
–200
–100
0
800
2486 F16
–300
–400
–500
200
400
600
1000
V
CC
= 5V
V
= 5V
V
REF
= 1.25V
V
IN–
= 3.75V
F
O
= GND
T
A
= 25
°
C
C
REF
= 1
μ
F, 10
μ
F
C
REF
= 0.1
μ
F
C
REF
= 0.01
μ
F
Figure 17. INL vs Differential Input Voltage and Reference
Source Resistance for C
REF
> 1μF
V
IN
/V
REF
–0.5
I
R
)
2
6
10
0.3
2486 F17
–2
–6
0
4
8
–4
–8
–10
–0.3
–0.1
0.1
0.5
V
CC
= 5V
V
REF
= 5V
V
IN(CM)
= 2.5V
T
A
°
C
C
REF
= 10
μ
F
R = 1k
R = 100
R = 500
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