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IC_VCO_voltrtge_controlled_oscillator_with_split_supply

2016-08-02 22:51  
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IC_VCO_voltrtge_controlled_oscillator_with_split_supply
IC_VCO_voltrtge_controlled_oscillator_with_split_supply
This circuit uses an XR-2207 to provide simultaneous triangle and square outputs (with binary keying if desired) over a frequency range of 0.01 Hz to 1 MHz, with a typical drift of 10 ppm/°C. The output can be linearly swept over a 1000:1 range with an external control voltage. Both the triangle and square output duty cycle can be varied from 0.1% to 99.9%. Electrical characteristics and functional circuits of the XR-2207 are shown in Figs. 5-36B and 5-36C, respectively. Operating frequency is set by capacitor C between pins 2 and 3, and timing resistors at pins 4-7. See Conditions in Fig. 5-36B.