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LTC2410IGN Datasheet(PDF) 25 Page - Linear Technology

No. de pieza LTC2410IGN
Descripción Electrónicos  24-Bit No Latency DSTM ADC with Differential Input and Differential Reference
PDF  48 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LTC2410IGN Datasheet(HTML) 25 Page - Linear Technology

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LTC2410
25
APPLICATIO S I FOR ATIO
The effect of this input dynamic current can be analyzed
using the test circuit of Figure 16. The CPAR 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 (CIN + CPAR) closer to 5pF
thus achieving better performance than the one predicted
by Figures 17 and 18. For simplicity, two distinct situa-
tions can be considered.
Figure 15. LTC2410 Equivalent Analog Input Circuit
Figure 16. An RC Network at IN+ and IN–
Figure 18. –FS Error vs RSOURCE at IN
+ or IN– (Small CIN)
Figure 17. +FS Error vs RSOURCE at IN
+ or IN– (Small CIN)
IIN
VV
V
R
IIN
VV
V
R
IREF
VV
V
R
V
VR
IREF
VV
V
R
V
VR
where
AVG
IN
INCM
REFCM
EQ
AVG
IN
INCM
REFCM
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
AVG
REF
INCM
REFCM
EQ
IN
REF
EQ
+
−
+
−
() = +−
•
() = −+
−
•
() = •−
+
•
−
•
() = −• −
+
•
+
•
05
05
15
05
15
05
2
2
.
.
.
.
.
.
::
.
.
./
V
REF
REF
V
REF
REF
VIN
IN
V
IN
IN
R
M
INTERNAL OSCILLATOR
Hz Notch F
LOW
R
M
INTERNAL OSCILLATOR
Hz Notch F
HIGH
R
f
EXTERNAL OSCILLATOR
REF
REFCM
IN
INCM
EQ
O
EQ
O
EQ
EOSC
=−
=
+


=−
=
−


==
()
==
()
=•
()
+−
+−
+−
+−
2
2
361
60
432
50
0 555 1012
Ω
Ω
VREF+
VIN+
VCC
RSW (TYP)
20k
ILEAK
ILEAK
VCC
ILEAK
ILEAK
VCC
RSW (TYP)
20k
CEQ
18pF
(TYP)
RSW (TYP)
20k
ILEAK
IIN+
VIN–
IIN–
IREF+
IREF–
2410 F15
ILEAK
VCC
ILEAK
ILEAK
SWITCHING FREQUENCY
fSW = 76800Hz INTERNAL OSCILLATOR (FO = LOW OR HIGH)
fSW = 0.5 • fEOSC EXTERNAL OSCILLATOR
VREF–
RSW (TYP)
20k
CIN
2410 F16
VINCM + 0.5VIN
RSOURCE
IN+
LTC2410
CPAR
≅20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN –
CPAR
≅20pF
RSOURCE (Ω)
1
10
100
1k
10k
100k
2410 F17
50
40
30
20
10
0
VCC = 5V
REF+ = 5V
REF – = GND
IN+ = 5V
IN– = 2.5V
FO = GND
TA = 25°C
CIN = 0.01µF
CIN = 0.001µF
CIN = 100pF
CIN = 0pF
RSOURCE (Ω)
1
10
100
1k
10k
100k
2410 F18
0
–10
–20
–30
–40
–50
VCC = 5V
REF+ = 5V
REF – = GND
IN+ = GND
IN– = 2.5V
FO = GND
TA = 25°C
CIN = 0.01µF
CIN = 0.001µF
CIN = 100pF
CIN = 0pF



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