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LTC2401CMS Datasheet(PDF) 24 Page - Linear Technology

No. de pieza LTC2401CMS
Descripción Electrónicos  1-/2-Channel 24-Bit mPower No Latency DSTMADCs in MSOP-10
PDF  32 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LTC2401CMS Datasheet(HTML) 24 Page - Linear Technology

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24
LTC2401/LTC2402
resistance independent of input capacitance, see Figures
20 and 21. The equivalent input impedance is 6.25M
Ω.
This results in
±400µA of input dynamic current at the
extreme values of VIN (VIN = 0V and VIN = VREF, when
VREF = 5V). This corresponds to a 0.8ppm shift in offset
and full-scale readings for every 10
Ω of input source
resistance.
CIN
24012 F17
INTPUT
SIGNAL
SOURCE
RSOURCE
VIN
LTC2401/
LTC2402
CPAR
≅20pF
APPLICATIO S I FOR ATIO
Figure 17. An RC Network at VIN
Figure 18. Offset vs RSOURCE (Small C)
Figure 19. Offset vs RSOURCE (Large C)
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
µV for a 10k source
resistance.
The effect of input leakage current is evident for CIN = 0 in
Figures 18 and 21. A leakage current of 3nA results in a
150
µV (30ppm) error for a 50k source resistance. As
RSOURCE gets larger, the switched capacitor input current
begins to dominate.
Reference Current (VREF)
Similar to the analog input, the reference input has a
dynamic input current. This current has negligible effect
Figure 20. Full-Scale Error vs RSOURCE (Large C)
Figure 21. Full-Scale Error vs RSOURCE (Small C)
RSOURCE (Ω)
1
–10
0
10
20
30
40
50
10
100
1k
10k
24012 F18
100k
VCC = 5V
VREF = 5V
VIN = 0V
TA = 25°C
CIN = 100pF
CIN = 0.01µF
CIN = 1000pF
CIN = NO CAP
RSOURCE (Ω)
0
40
60
800
24012 F19
20
0
200
400
600
1000
80
CIN = 22µF
CIN = 10µF
CIN = 1µF
CIN = 0.1µF
CIN = 0.01µF
CIN = 0.001µF
VCC = 5V
VREF = 5V
VIN = 0V
TA = 25°C
RSOURCE (Ω)
0
–80
–70
–50
–40
–30
400
800
1000
10
24012 F20
–60
200
600
–20
–10
0
CIN = 22µF
CIN = 10µF
CIN = 1µF
CIN = 0.1µF
CIN = 0.01µF
CIN = 0.001µF
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
RSOURCE (Ω)
0
–10
10
10k
24012 F21
–30
–50
10
100
1k
100k
30
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
CIN = NO CAP
CIN = 0.01µF
CIN = 1000pF
CIN = 100pF



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