參數(shù)資料
型號(hào): LTC2413
廠商: Linear Technology Corporation
元件分類: ADC
英文描述: 2.7V to 5.5V Simultaneous 50Hz/60Hz Rejection Micropower Differential Σ△ Analog to Digital Converter(2.7V ~5.5V,微功耗,24位差分Σ△串行模數(shù)轉(zhuǎn)換器)
中文描述: 2.7V至5.5V同步50Hz/60Hz抑制微差分Σ△模數(shù)轉(zhuǎn)換器(2.7?5.5V的,微功耗,24位差分Σ△串行模數(shù)轉(zhuǎn)換器)
文件頁(yè)數(shù): 21/40頁(yè)
文件大?。?/td> 373K
代理商: LTC2413
LTC2413
21
APPLICATIU
W
U
U
The effect of this input dynamic current can be analyzed
using the test circuit of Figure 17. The C
PAR
capacitor
includes the LTC2413 pin capacitance (5pF typical) plus
the capacitance of the test fixture used to obtain the results
shown in Figures 18 and 19. A careful implementation can
bring the total input capacitance (C
IN
+ C
PAR
) closer to 5pF
thus achieving better performance than the one predicted
by Figures 18 and 19. For simplicity two distinct situations
can be considered.
Figure 16. LTC2413 Equivalent Analog Input Circuit
Figure 17. An RC Network at IN
+
and IN
Figure 19. –FS Error vs R
SOURCE
at IN
+
or IN
(Small C
IN
)
Figure 18. +FS Error vs R
SOURCE
at IN
+
or IN
(Small C
IN
)
I IN
V
V
0 5
.
V
R
I IN
V
V
0 5
.
V
R
0 5
.
I REF
V
V
V
R
V
V
V
R
2
I REF
V
V
R
V
V
R
where
V
REF
AVG
IN
INCM
REFCM
EQ
AVG
)
)
:
REF
=
IN
INCM
REFCM
EQ
AVG
REF
INCM
0 5
.
REFCM
EQ
IN
REF
EQ
AVG
REF
INCM
EQ
REFCM
IN
REF
EQ
+
+
)
)
=
+
=
+
=
+
=
+
+
1 5
.
1 5
.
2
.
.
/
REF
+
V
REF
REF
V
IN
IN
+
V
IN
IN
R
M
INTERNAL OSCILLATOR
)
R
f
EXTERNAL OSCILLATOR
REFCM
IN
INCM
EQ
EQ
EOSC
=
+
2
=
=
2
=
=
(
+
+
3 97
0 555 10
12
V
REF
+
V
IN
+
V
CC
R
SW
(TYP)
20k
I
LEAK
I
LEAK
V
CC
V
CC
I
LEAK
I
LEAK
R
SW
(TYP)
20k
C
18pF
(TYP)
R
SW
(TYP)
20k
I
LEAK
I
IN
+
V
IN
I
IN
I
REF
+
I
REF
2413
F16
I
LEAK
V
CC
I
LEAK
I
LEAK
SWITCHING FREQUENCY
f
SW
= 69900Hz INTERNAL OSCILLATOR
f
SW
= 0.5 f
EOSC
EXTERNAL OSCILLATOR
V
REF
R
SW
(TYP)
20k
C
IN
2413
F17
V
INCM
+ 0.5V
IN
R
SOURCE
IN
+
LTC2413
C
PAR
20pF
C
IN
V
INCM
– 0.5V
IN
R
SOURCE
IN
C
PAR
20pF
R
SOURCE
(
)
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
+
R
)
2413 F18
50
40
30
20
10
0
V
= 5V
REF
+
= 5V
REF
= GND
IN
+
= 5V
IN
= 2.5V
F
O
= GND
T
A
= 25
°
C
C
IN
= 0.01
μ
F
C
IN
= 0.001
μ
F
C
IN
= 100pF
C
IN
= 0pF
R
SOURCE
(
)
1.E+00
1.E+01
1.E+02
1.E+03
1.E+04
1.E+05
R
)
2413 F19
0
–10
–20
–30
–40
–50
V
= 5V
REF
+
= 5V
REF
= GND
IN
+
= GND
IN
= 2.5V
F
O
= GND
T
A
= 25
°
C
C
IN
= 0.01
μ
F
C
IN
= 0.001
μ
F
C
IN
= 100pF
C
IN
= 0pF
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