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数字控制的正弦波发生器 Maxim > App Notes > Automotive Filter Circuits (Analog) Signal Generation Circuits
Keywords: digitally controlled sine-wave generator, sine wave, circuits, IC3 Jun 27, 2003
APPLICATION NOTE 2081
Digitally Controlled Sine-Wave Generator
A similar version of this article appeared in the May 15, 2003 issue of EDN magazine.
The circuit of Figure 1 produces an accurate variable-frequency sine wave for use as a general-purpose reference signal. It
includes an 8th-order elliptic, switched-capacitor lowpass filter (IC3) that is clocked with a 100kHz square wave generated by
microcontroller IC2. (Any other convenient squarewave source is also acceptable.) The microcontroller is clocked by a 10MHz
oscillator module. A vo
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