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LTC2400CS8 数据表(PDF) 23 Page - Linear Technology

部件名 LTC2400CS8
功能描述  24-Bit uPower No Latency ADC in SO-8
PDF  40 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC2400CS8 数据表(HTML) 23 Page - Linear Technology

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LTC2400
APPLICATIONS INFORMATION
CIN
2400 F17
INTPUT
SIGNAL
SOURCE
RSOURCE
VIN
LTC2400
CPAR
≅20pF
Figure 17. An RC Network at VIN
RSOURCE (Ω)
1
30
40
50
10k
2400 F18
20
10
0
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN = 0V
TA = 25°C
CIN = 100pF
CIN = 1000pF
CIN = 0pF
CIN = 0.01µF
Figure 18. Offset vs RSOURCE (Small C)
RSOURCE (Ω)
1
–20
–10
0
10k
2400 F19
–30
–40
–50
10
100
1k
100k
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
CIN = 0pF
CIN = 100pF
CIN = 1000pF
CIN = 0.01µF
Figure 19. Full-Scale Error vs RSOURCE (Small C)
RSOURCE (Ω)
0
100
200
300
50
150
250
200
400
600
800
2400 F20
1000
100
0
300
500
700
900
VCC = 5V
VREF = 5V
VIN = 0V
TA = 25°C
CIN = 1µF
CIN = 10µF
CIN = 0.1µF
CIN = 0.01µF
Figure 20. Offset vs RSOURCE (Large C)
0
TUE
VREF/2
VIN
2400 F16
VREF
Figure 16. Offset/Full-Scale Shift
Input Current (VIN)
If complete settling occurs on the input, conversion re-
sults will be uneffected by the dynamic input current. If the
settling is incomplete, it does not degrade the linearity
performance of the device. It simply results in an offset/
full-scale shift, see Figure 16. To simplify the analysis of
input dynamic current, two separate cases are assumed:
large capacitance at VIN (CIN > 0.01µF) and small capaci-
tance at VIN (CIN < 0.01µF).
If the total capacitance at VIN (see Figure 17) is small
(< 0.01
µF), relatively large external source resistances (up
to 20k for 20pF parasitic capacitance) can be tolerated
without any offset/full-scale error. Figures 18 and 19 show
a family of offset and full-scale error curves for various
small valued input capacitors (CIN < 0.01µF) as a function
of input source resistance.
For large input capacitor values (CIN > 0.01µF), the input
spikes are averaged by the capacitor into a DC current. The
gain shift becomes a linear function of input source
resistance independent of input capacitance, see Figures
20 and 21. The equivalent input impedance is 1.66M
Ω.
This results in
±1.5µA of input dynamic current at the
extreme values of VIN (VIN = 0V and VIN = VREF, when



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