LTC2410CGN Linear Technology, LTC2410CGN Datasheet - Page 25

• Manufacturer Part Number: LTC2410CGN
• Description: IC ADC 24BIT DIFF INP/REF 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC2410CGN

• Number Of Bits: 24
• Sampling Rate (per Second): 7.5
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 2
• Power Dissipation (max): 1mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: Q894257

APPLICATIO S I FOR ATIO
The effect of this input dynamic current can be analyzed
using the test circuit of Figure 16. The C
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
thus achieving better performance than the one predicted
by Figures 17 and 18. For simplicity, two distinct situa-
tions can be considered.
Figure 17. +FS Error vs R
50
40
30
20
10
SWITCHING FREQUENCY
f
f
SW
SW
V
V
0
I
V
I
V
I
REF
REF
REF
REF
I
1
IN
IN
IN
IN
= 76800Hz INTERNAL OSCILLATOR (F
= 0.5 • f
+
+
–
–
+
+
–
–
V
REF
REF
IN
IN
F
T
O
CC
A
+
–
= GND
= 25 C
U
+
= 5V
= 2.5V
V
V
–
= 5V
10
EOSC
CC
CC
C
= 5V
= GND
C
IN
C
IN
IN
= 0.001 F
C
V
V
EXTERNAL OSCILLATOR
= 0.01 F
I
I
I
I
LEAK
LEAK
LEAK
LEAK
= 100pF
IN
CC
CC
SOURCE
U
= 0pF
100
R
SOURCE
I
I
I
I
LEAK
LEAK
LEAK
LEAK
( )
at IN
1k
R
R
R
R
SW
SW
SW
SW
IN
20k
20k
20k
20k
W
(TYP)
(TYP)
(TYP)
(TYP)
+ C
+
Figure 15. LTC2410 Equivalent Analog Input Circuit
or IN
10k
PAR
O
= LOW OR HIGH)
2410 F17
–
) closer to 5pF
PAR
(Small C
100k
2410 F15
U
capacitor
IN
C
18pF
(TYP)
EQ
)
Figure 18. –FS Error vs R
I IN
I IN
I REF
I REF
R
R
R
where
V
V
V
V
REF
REFCM
IN
INCM
EQ
EQ
EQ
V
V
INCM
INCM
IN
AVG
AVG
: :
3 61
4 32
REF
0 555 10
AVG
.
.
AVG
.
+ 0.5V
– 0.5V
IN
Figure 16. An RC Network at IN
M
M
REF
IN
V
–10
–20
–30
–40
–50
IN
V
1 5
2
IN
REF
.
0
INTERNAL OSCILLATOR
IN
INTERNAL OSCILLATOR
IN
IN
1 5
.
12
V
2
1
0 5
INCM
0 5
V
REF
.
V
REF
INCM
.
V
/
V
REF
REF
IN
IN
F
T
REF
f
O
A
EOSC
CC
R
0 5
+
–
R
R
R
= GND
0 5
= 25 C
EQ
.
+
= GND
= 2.5V
–
V
EQ
.
SOURCE
SOURCE
= 5V
V
10
REFCM
C
= 5V
= GND
INCM
V
EXTERNAL OSCILLATOR
V
C
R
IN
REFCM
INCM
C
R
IN
EQ
IN
EQ
= 0.001 F
C
= 0.01 F
= 100pF
IN
V
SOURCE
REFCM
R
= 0pF
100
V
SOURCE
REFCM
C
C
60
IN
IN
50
Hz Notch F
Hz Notch F
V
at IN
REF
( )
V
1k
REF
V
IN
2
V
R
IN
2
C
C
+
EQ
R
PAR
PAR
20pF
20pF
EQ
or IN
+
O
O
10k
and IN
LTC2410
LOW
HIGH
2410 F18
–
IN
IN
LTC2410
(Small C
100k
+
–
–
2410 F16
25
IN
)