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LTC2435-1IGN Datasheet(PDF) 26 Page - Linear Technology

Part # LTC2435-1IGN
Description  20-Bit No Latency ADCs with Differential Input and Differential Reference
PDF  40 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2435-1IGN Datasheet(HTML) 26 Page - Linear Technology

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LTC2435/LTC2435-1
26
24351fa
APPLICATIO S I FOR ATIO
Figure 14. LTC2435/LTC2435-1 Equivalent Analog Input Circuit
Figure 15. An RC Network at IN+ and IN–
Figure 17. –FS Error vs RSOURCE at IN
+ or IN– (Small CIN)
Figure 16. +FS Error vs RSOURCE at IN+ or IN– (Small CIN)
IIN
VV
V
R
IIN
VV
V
R
I REF
VV
V
R
V
VR
I REF
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
REF
REFCM
IN
INCM
REQ = 43.2MΩ INTERNAL OSCILLATOR 60Hz NOTCH (FO = LOW) LTC2435
REQ = 52MΩ INTERNAL OSCILLATOR 50Hz NOTCH (FO = HIGH) LTC2435
REQ = 48MΩ INTERNAL OSCILLATOR 50Hz/60Hz NOTCH (FO = LOW) LTC2435-1
REQ = (6.7 • 1012)/fEOSC EXTERNAL OSCILLATOR
=
−
=
+
⎛
⎝
⎜
⎞
⎠
⎟
=
−
=
−
⎛
⎝
⎜
⎞
⎠
⎟
+
−
+
−
+
−
+
−
2
2
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–
2435 F18
ILEAK
VCC
ILEAK
ILEAK
SWITCHING FREQUENCY
fSW = 76800Hz INTERNAL
OSCILLATOR (LTC2435)
(FO = LOW OR HIGH)
fSW = 69900Hz INTERNAL
OSCILLATOR (LTC2435-1)
(FO = LOW)
fSW = 0.5 • fEOSC EXTERNAL OSCILLATOR
VREF–
RSW (TYP)
20k
CIN
2435 F19
VINCM + 0.5VIN
RSOURCE
IN+
LTC2435/
LTC2435-1
CPAR
≅ 20pF
CIN
VINCM – 0.5VIN
RSOURCE
IN –
CPAR
≅ 20pF
RSOURCE (W)
1
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10000
2435 F16
10
100
1000
100000
CIN = 0pF
CIN = 100pF
CIN = 0.01µF
CIN = 0.001µF
VCC = 5V
VREF+ = 5V
VREF– = GND
VIN+ = 3.75V
VIN– = 1.25V
FO = GND
TA = 25°C
RSOURCE (W)
1
100
90
80
70
60
50
40
30
20
10
0
–10
10000
2435 F17
10
100
1000
100000
CIN = 0pF
CIN = 0.01µF
VCC = 5V
VREF+ = 5V
VREF– = GND
VIN+ = 1.25V
VIN– = 3.75V
FO = GND
TA = 25°C
CIN = 100pF
CIN = 0.001µF



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