參數(shù)資料
型號： LTC2410CGN
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 20-Bit Universal Bus Driver With 3-State Outputs 56-SSOP -40 to 85
中文描述： 1-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO16
封裝： 0.150 INCH, PLASTIC, SSOP-16
文件頁數(shù)： 21/44頁
文件大小： 778K
代理商： LTC2410CGN
LTC2410
21
APPLICATIU
W
U
U
The effect of this input dynamic current can be analyzed
using the test circuit of Figure 16. The C
PAR
capacitor
includes the LTC2410 pin capacitance (5pF typical) plus
the capacitance of the test fixture used to obtain the results
shown in Figures 17 and 18. 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 17 and 18. For simplicity two distinct situations
can be considered.
Figure 15. LTC2410 Equivalent Analog Input Circuit
Figure 16. An RC Network at IN
+
and IN
–
Figure 18. –FS Error vs R
SOURCE
at IN
+
or IN
–
(Small C
IN
)
Figure 17. +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
)
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
REF
+
V
REF
REF
V
IN
IN
+
V
IN
IN
R
R
M
M
INTERNAL OSCILLATOR
INTERNAL OSCILLATOR
)
Hz Notch F
Hz Notch F
50
LOW
HIGH
R
f
EXTERNAL OSCILLATOR
REFCM
IN
INCM
EQ
O
EQ
O
EQ
EOSC
=
+
2
=
=
2
=
=
=
=
(
(
)
)
=
(
+
+
3 61
4 32
0 555 10
12
60
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
–
2410 F15
I
LEAK
V
CC
I
LEAK
I
LEAK
SWITCHING FREQUENCY
f
SW
= 76800Hz INTERNAL OSCILLATOR (F
O
= LOW OR HIGH)
f
SW
= 0.5 f
EOSC
EXTERNAL OSCILLATOR
V
REF
–
R
SW
(TYP)
20k
C
IN
2410 F16
V
INCM
+ 0.5V
IN
R
SOURCE
IN
+
LTC2410
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
)
2410 F17
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
)
2410 F18
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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PDF描述
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