LTC2402IMS Linear Technology, LTC2402IMS Datasheet - Page 24

• Manufacturer Part Number: LTC2402IMS
• Description: IC ADC 24BIT 2CH MICROPWR 10MSOP
• Manufacturer: Linear Technology

Specifications of LTC2402IMS

• 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: -40°C ~ 85°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

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