LTC2402CMS Linear Technology, LTC2402CMS Datasheet - Page 24
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LTC2402CMS
Manufacturer Part Number
LTC2402CMS
Description
IC ADC 24BIT 2CH MICROPWR 10MSOP
Manufacturer
Linear Technology
Datasheet
1.LTC2401CMSPBF.pdf
(32 pages)
Specifications of LTC2402CMS
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
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC2402CMS
Manufacturer:
LT
Quantity:
10 000
Part Number:
LTC2402CMS
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Part Number:
LTC2402CMS#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIO S I FOR ATIO
LTC2401/LTC2402
resistance independent of input capacitance, see Figures
20 and 21. The equivalent input impedance is 6.25M .
This results in 400 A of input dynamic current at the
extreme values of V
V
and full-scale readings for every 10
resistance.
24
REF
= 5V). This corresponds to a 0.8ppm shift in offset
SOURCE
SIGNAL
INTPUT
–10
80
60
40
20
50
40
30
20
10
Figure 18. Offset vs R
Figure 19. Offset vs R
0
0
0
1
V
V
V
T
V
V
V
T
Figure 17. An RC Network at V
A
CC
REF
IN
CC
REF
IN
A
= 25 C
= 25 C
= 0V
= 0V
= 5V
= 5V
R
= 5V
= 5V
200
SOURCE
10
C
C
C
C
C
C
C
U
IN
IN
IN
IN
IN
IN
IN
C
IN
= 22 F
= 10 F
= 1 F
= 0.1 F
= 0.01 F
= 0.001 F
IN
= NO CAP
C
IN
= 1000pF
(V
100
400
R
R
= 0.01 F
SOURCE
SOURCE
U
IN
C
IN
= 0V and V
600
( )
( )
1k
SOURCE
SOURCE
C
W
PAR
C
20pF
IN
10k
800
(Small C)
(Large C)
= 100pF
24012 F19
24012 F18
IN
of input source
IN
V
LTC2401/
1000
LTC2402
100k
IN
= V
24012 F17
U
REF
, when
In addition to the input current spikes, the input ESD
protection diodes have a temperature dependent leakage
current. This leakage current, nominally 1nA ( 10nA
max), results in a fixed offset shift of 10 V for a 10k source
resistance.
The effect of input leakage current is evident for C
Figures 18 and 21. A leakage current of 3nA results in a
150 V (30ppm) error for a 50k source resistance. As
R
begins to dominate.
Reference Current (V
Similar to the analog input, the reference input has a
dynamic input current. This current has negligible effect
SOURCE
Figure 21. Full-Scale Error vs R
Figure 20. Full-Scale Error vs R
gets larger, the switched capacitor input current
–30
–50
–10
–10
–20
–30
–40
–60
–50
–70
–80
30
10
10
0
0
0
V
V
V
T
A
CC
REF
IN
= 25 C
= 5V
= 5V
= 5V
10
200
C
C
C
C
C
C
C
C
IN
IN
IN
IN
IN
IN
IN
IN
= 22 F
= 10 F
= 1 F
= 0.1 F
= 0.01 F
= 0.001 F
C
= 0.01 F
REF
= 1000pF
IN
100
R
= 100pF
R
400
SOURCE
SOURCE
)
C
IN
= NO CAP
( )
( )
1k
600
SOURCE
SOURCE
10k
V
V
V
T
800
A
CC
REF
IN
= 25 C
24012 F20
= 5V
24012 F21
= 5V
= 5V
100k
(Small C)
(Large C)
1000
IN
= 0 in