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July 1996, vol.13, no. 5
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Access TI's on-line technical documentation.
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App ReportUse of the TMS320C5x internal oscillator with external crystals or ceramic resonators: The TMS320C5x, one of TI's high-speed digital signal processors, is capable of performing operations at a rate of up to 50 million instructions per second. The variety of digital signal processing applications requires a wide range of clocking frequencies. The 'C5x allows considerable flexibility in meeting these clocking requirements. This application report provides information regarding crystal and ceramic resonators, their frequency characteristics, a general background on oscillators and the type of oscillator circuit used on the 'C5x. Also covered are design aspects of the 'C5x oscillator including appropriate configuration of the external components, measured parameters for the on-board portion of the circuitry, use of the oscillator with overtone crystals and general design considerations for choosing the external components for the oscillator. Finally, this report shows some design solutions for common frequencies.
The complete applications report can be found at
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Various measurements have been made on the internal
oscillator circuitry on the 'C5x to aid in design and analysis
of an oscillator. This diagram shows that the internal transistor
feedback network determines the bias point of the inverter within
its linear region.