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NCD2400M Datasheet(PDF) 11 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

NCD2400M Datasheet(HTML) 11 Page - IXYS Corporation

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3. Functional Description
3.1 Introduction
The NCD2400M provides a digitally controlled variable
output capacitance between pins CP and CN. This
capacitance can be used as a series capacitor
(between CP and CN) or a shunt capacitor
(connecting CN to GND). Do not connect CP to GND.
The output capacitance is set by either the content of
the Volatile Register or by the content stored in the
re-programmable Non-Volatile Memory.
Upon power-up, the default capacitance value
between CP and CN is determined by the digital value
stored in the non-volatile memory. The capacitance
can, however, be controlled directly with the content of
the Volatile Register.
The output capacitance presented by the NCD2400M
between pins CP and CN is defined by:
COUT = C0 + Cvar
C0 is the base output capacitance (Code 0) and
Cvar is the variable tuning capacitance, whose value
is set by the 9-bit CDAC control word
The NCD2400M has two operating modes related to
the way the programmable capacitor is controlled:
Volatile and Non-Volatile.
Volatile Mode: the Control Data value in the Volatile
Register determines the output capacitance.
Non-Volatile Mode (Default mode): the Control Data
value stored in the Non-Volatile Memory determines
the output capacitance.
In Non-Volatile Mode, the default mode, the Control
Data value is determined by the content programmed
into the non-volatile memory. This mode is useful in
situations where the required output capacitance is
unlikely to change and the control data must be
retained during periods of no power.

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