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Using PWM Output as a Digital-to-Analog …
Application Report SPRAA88A September 2008. Using PWM Output as a Digital-to-Analog converter on a tms320f280x digital Signal Controller David M. Alter DSP Applications Semiconductor Group ABSTRACT. This application report presents a method for utilizing the on-chip pulse width modulated (PWM) signal generators on the tms320f280x family of digital signal controllers as a Digital-to-Analog converter (DAC). The method involves analog low-pass filtering the PWM signal to remove high frequency components, leaving only the low-frequency content. Theoretical and experimental results are presented to quantify the achievable bit resolution and bandwidth, which depend upon the analog low-pass filter employed, the PWM frequency, and the DSP operating frequency. When coupled with a second order passive RLC filter, the hi-resolution PWM module on the tms320f280x device is seen capable of providing greater than 9 bits of DAC resolution with 100 kHz bandwidth.
SPRAA88A 2 Using PWM Output as a Digital-to-Analog Converter on a TMS320F280x Digital Signal Controller Contents 1 Introduction .....4
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