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LTC2420 Datasheet(PDF) 25 Page - Linear Technology

No. de pieza LTC2420
Descripción Electrónicos  20-Bit mPower No Latency DSTM ADC in SO-8
PDF  36 Pages
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Fabricante Electrónico  LINER [Linear Technology]
Página de inicio  http://www.linear.com
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LTC2420 Datasheet(HTML) 25 Page - Linear Technology

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LTC2420
APPLICATIO S I FOR ATIO
node VREF is small (CVREF < 0.01µF), the reference input
can tolerate large external resistances without reduction
in INL, see Figure 25. If the external capacitance is large
(CVREF > 0.01µF), the linearity will be degraded by
0.015ppm/
Ω independent of capacitance at VREF, see
Figure 26.
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.
ANTIALIASING
One of the advantages delta-sigma ADCs offer over con-
ventional ADCs is on-chip digital filtering. Combined with
a large oversampling ratio, the LTC2420 significantly
simplifies antialiasing filter requirements.
The digital filter provides very high rejection except at
integer multiples of the modulator sampling frequency
(fS), see Figure 27. The modulator sampling frequency is
256 • FO, where FO is the notch frequency (typically 50Hz
or 60Hz). The bandwidth of signals not rejected by the
digital filter is narrow (
≈0.2%)comparedtothebandwidth
of the frequencies rejected.
RESISTANCE AT VREF (Ω)
0
40
50
60
600
800
2420 F23
30
20
200
400
1000
10
0
–10
CVREF = 22µF
CVREF = 10µF
CVREF = 1µF
CVREF = 0.1µF
CVREF = 0.01µF
CVREF = 0.001µF
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
RESISTANCE AT VREF (Ω)
1
300
400
500
1k
10k
2420 F24
200
100
10
100
100k
0
–100
–200
VCC = 5V
VREF = 5V
VIN = 5V
TA = 25°C
CVREF = 0.01µF
CVREF = 100pF
CVREF = 1000pF
CVREF = 0pF
RESISTANCE AT VREF (Ω)
1
30
40
50
1k
10k
2420 F25
20
10
10
100
100k
0
–10
–20
VCC = 5V
VREF = 5V
TA = 25°C
CVREF = 0.01µF
CVREF = 1000pF
CVREF = 0pF
CVREF = 100pF
RESISTANCE AT VREF (Ω)
0
6
8
10
600
800
2420 F26
4
2
–2
–4
–6
–8
–10
200
400
1000
0
CVREF = 22µF
CVREF = 10µF
CVREF = 1µF
CVREF = 0.1µF
CVREF = 0.01µF
CVREF = 0.001µF
VCC = 5V
VREF = 5V
TA = 25°C
Figure 23. Full-Scale Error vs RVREF (Large C)
Figure 24. Full-Scale Error vs RVREF (Small C)
Figure 25. INL Error vs RVREF (Small C)
Figure 26. INL Error vs RVREF (Large C)



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