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LTC2402CMS bảng dữ liệu(PDF) 25 Page - Linear Technology

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LTC2402CMS bảng dữ liệu(HTML) 25 Page - Linear Technology

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LTC2401/LTC2402
on the offset. However, the reference current at VIN = VREF
is similar to the input current at full-scale. For large values
of reference capacitance (CVREF > 0.01µF), the full-scale
error shift is 0.08ppm/
Ω of external reference resistance
independent of the capacitance at VREF, see Figure 22. If
the capacitance tied to VREF is small (CVREF < 0.01µF), an
input resistance of up to 20k (20pF parasitic capacitance
at VREF) may be tolerated, see Figure 23.
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
APPLICATIO S I FOR ATIO
Figure 22. Full-Scale Error vs RVREF (Large C)
Figure 23. Full-Scale Error vs RVFEF (Small C)
Figure 24. INL Error vs RVREF (Small C)
Figure 25. INL Error vs RVREF (Large C)
at node VREF is small (CVREF < 0.01µF), the reference input
can tolerate large external resistances without reduction
in INL, see Figure 24. If the external capacitance is large
(CVREF > 0.01µF), the linearity will be degraded by
0.04ppm/
Ω independent of capacitance at VREF, see
Figure 25.
In addition to the dynamic reference current, the VREF ESD
protection diodes have a temperature dependent leakage
current. This leakage current, nominally 1nA (
±10nAmax),
results in a fixed full-scale shift of 10
µV for a 10k source
resistance.
RESISTANCE AT VREF (Ω)
0
80
120
800
24012 F22
40
0
200
400
600
1000
160
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
CIN = 10µF
CIN = 0.1µF
CIN = 0.01µF
CIN = 1µF
RESISTANCE AT VREF (Ω)
100
–50
–25
0
25
50
CIN = 10µF
1k
10k
24012 F23
100k
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
CIN = 20pF
CIN = 1000pF
CIN = 100pF
RESISTANCE AT VREF (Ω)
100
0
10
20
CIN = 0.01µF
CIN = 20pF
CIN = 1000pF
CIN = 100pF
30
40
50
VCC = 5V
VREF = 5V
TA = 25°C
1k
10k
24012 F24
100k
RESISTANCE AT VREF (Ω)
0
20
30
800
24012 F25
10
0
200
400
600
1000
40
VCC = 5V
VREF = 5V
TA = 25°C
CVREF = 10µF
CVREF = 0.1µF
CVREF = 1µF
CVREF = 0.01µF



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