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NCD2400M Datasheet(PDF) 9 Page - IXYS Corporation |
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NCD2400M Datasheet(HTML) 9 Page - IXYS Corporation |
9 / 22 page ![]() 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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