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NCD2400M Datasheet(PDF) 9 Page - IXYS Corporation

Part No. NCD2400M
Description  Wide Capacitance Range, Non-volatile Digital Programmable Capacitor
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Maker  IXYS [IXYS Corporation]
Homepage  http://www.ixys.com
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NCD2400M Datasheet(HTML) 9 Page - IXYS Corporation

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INTEGRATED CIRCUITS DIVISION
NCD2400M
R01
www.ixysic.com
9
The figure below shows how the capacitance varies with the supply voltage while CN is biased at one-half of the
supply voltage level. Here, the value obtained for 3.3V is used as a reference and the deviation is given in percentage.
Please note that for VDD > 3.6V no further variations are expected.
Figure 6: Variation of the Capacitance at 10MHz with Supply Voltage, Relative to the Value at 3.3V
DC voltage biasing of the CN terminal has a small though visible influence on the performance of the Digital
Programmable Capacitor. The table below presents the variation of the series capacitance and ESR at 10MHz when
pin CN is biased at 0V, 1.65V and 3.3V, with VDD=3.3V. DC bias applied to pin CP has no affect on the capacitance or
ESR values.
Capacitance (pF)
ESR (
)
Code / Vbias (V)
0
1.65
3.3
0
1.65
3.3
0
1.7
1.7
1.9
0.509
0.442
0.695
1
2.1
2.1
2.3
0.739
0.720
1.006
2
2.5
2.5
2.7
0.949
0.973
1.29
4
3.2
3.2
3.5
1.271
1.366
1.742
8
4.7
4.7
5.1
1.754
1.952
2.431
16
7.6
7.7
8.2
2.256
2.564
3.188
32
13.7
13.7
14.3
4.342
4.968
6.31
64
25.6
25.6
26.4
3.259
3.755
4.882
128
49.6
49.6
50.3
2.063
2.372
3.14
256
97.4
97.5
98.1
1.204
1.377
1.827
511
193.2
194
193.2
0.75
0.846
1.106
Supply Voltage (V)
2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
Capacitance Variation
vs. Supply Voltage Relative to 3.3V
(f=10MHz)
C
0
C
1
C
2
C
4
C
8
C
16
C
32
C
64
C
128
C
256
C
511


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