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AL Tech 8CH Bedienungsanleitung Seite 27

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Seitenansicht 26
27
LTC2424/LTC2428
nonlinearity of the multiplexer switch is seen in the
overall transfer characteristic.
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 10µV for a 10k source
resistance.
Reference Current (V
REF
)
Similar to the analog input, the reference input has a
dynamic input current. This current has negligible effect
on the offset. However, the reference current at V
IN
= V
REF
is similar to the input current at full-scale. For large values
of reference capacitance (C
VREF
> 0.01µF), the full-scale
APPLICATIONS INFORMATION
WUU
U
error shift is 0.03ppm/Ω of external reference resistance
independent of the capacitance at V
REF
, see Figure 25. If
the capacitance tied to V
REF
is small (C
VREF
< 0.01µF), an
input resistance of up to 80k (20pF parasitic capacitance
at V
REF
) may be tolerated, see Figure 26.
Unlike the analog input, the integral nonlinearity of the
device can be degraded with excessive external RC time
constants tied to the reference input. If the capacitance at
node V
REF
is small (C
VREF
< 0.01µF), the reference input
can tolerate large external resistances without reduction
in INL, see Figure 27. If the external capacitance is large
(C
VREF
> 0.01µF), the linearity will be degraded by
0.015ppm/Ω independent of capacitance at V
REF
, see
Figure 28.
RESISTANCE AT V
REF
(Ω)
0
40
50
60
600 800
24248 F25
30
20
200 400 1000
10
0
–10
FULL-SCALE ERROR (ppm)
C
VREF
= 22µF
C
VREF
= 10µF
C
VREF
= 1µF
C
VREF
= 0.1µF
C
VREF
= 0.01µF
C
VREF
= 0.001µF
V
CC
= 5V
V
REF
= 5V
V
IN
= 5V
T
A
= 25°C
Figure 25. Full-Scale Error vs R
VREF
(Large C)
RESISTANCE AT V
REF
(Ω)
1
300
400
500
1k 10k
24248 F26
200
100
10 100 100k
0
–100
–200
VOLTAGE
V
CC
= 5V
V
REF
= 5V
V
IN
= 5V
T
A
= 25°C
C
VREF
= 0.01µF
C
VREF
= 100pF
C
VREF
= 1000pF
C
VREF
= 0pF
Figure 26. Full-Scale Error vs R
VREF
(Small C)
Figure 23. Offset vs R
SOURCE
(Large C)
Figure 24. Full-Scale Error vs R
SOURCE
(Large C)
R
SOURCE
(Ω)
0
25
30
35
600 800
24248 F23
20
15
200 400 1000
10
5
0
OFFSET ERROR (ppm)
C
IN
= 22µF
C
IN
= 10µF
C
IN
= 1µF
C
IN
= 0.1µF
C
IN
= 0.01µF
C
IN
= 0.001µF
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
T
A
= 25°C
R
SOURCE
(Ω)
0
FULL-SCALE ERROR (ppm)
–20
–15
–10
600
1000
24248 F24
–25
–30
–35
200 400 800
–5
0
5
C
IN
= 22µF
C
IN
= 10µF
C
IN
= 1µF
C
IN
= 0.1µF
C
IN
= 0.01µF
C
IN
= 0.001µF
V
CC
= 5V
V
REF
= 5V
V
IN
= 0V
T
A
= 25°C
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