This article describes how to use a low-cost method to construct a sine wave oscillator with little distortion and controlled by the bus.
The circuit produces a sinusoidal output with typical second and third harmonics in the full output range of 10 Hz to 10 kHz, which are -76.1 dB and -74.2 dB lower than the baseband signal, respectively. The performance of this sine wave oscillator is 40 dB higher than that of a conventional diode shaped sine generator that uses a diode shaping technique to convert a square wave to a sine wave. Under normal circumstances, the second or third harmonic of the diode shaping sine generator is -35dB and -25.5dB lower than the fundamental frequency, respectively.
This circuit consists of four parts (as shown in the figure). The core of the design, that is, the first part is the oscillator, which includes the dual filter building block IC (U1), the second-order clock filter (the band-pass filter part of which sets the frequency of the oscillator), and the comparator (U2A). The bandpass filter determines the frequency of the oscillator by allowing only signals near the center frequency of the oscillator to pass. Equation 1 gives the frequency of the oscillator, and Equation 2 shows the Q of the filter.
The second circuit part is the tracking notch filter, which is set and tracks the third harmonic of the oscillator, which is a higher amplitude harmonic. The tracking filter synchronizes the clock with the oscillator's frequency setting filter to provide lock-step oscillator tracking, filter response characteristics.
Equation 3 shows the -3dB cutoff point of the tracking filter, and Equation 4 shows the notch filter frequency.
The third part has a -1 gain buffer amplifier (U3A). This section includes a 13.3 kHz low-pass filter that is used to reduce the high-frequency components produced by the clock steps in the output waveform.
The fourth part is a bus-controlled clock generator, which mainly includes an IC serial port programmable oscillator (U4), which can be LTC6903 for serial peripheral interface (SPI), or it can be used for The internal IC (I2C) interface of the LTC6904. Some pull-up resistors, decoupling capacitors, and a resistor connected in series with the output are only required for several external devices.
In addition, the circuit can be easily adjusted to produce an integral, sine/cosine waveform output. Just add a second output op amp and accept its input from the bandpass output of U1 (BPB at pin 11).
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4.2mm Wire To Board Connectors are avialable in different terminations and sizes intended for use on a variety of applications. These connectors provide power and signal with different body styles, termination options, and centerlines. To find the wire to board set required, click on the appropriate sub section below.
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male housing
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Header
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4.2 mm connectors wire to board connectors General Specification:
Current rating: 6A AC, DC.(AWG#18)
Voltage Rating: 600V AC,DC
Withstanding Voltage: 1500V AC/minute.
Insulation resistance: 1000MΩ min
Contact resistance: Initial Value/ 10mΩ max
Temperature rise: -40'C ~ 105'C.
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