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Microchip Technology Audio Digital-to-Analog Converter Manual de usuario Pagina 21

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© 2007 Microchip Technology Incorporated. All Rights Reserved. Audio Digital-to-Analog Converter Slide 21
DAC Conversion Process
Lastly, the bitstream from the modulator is processed by the reconstruction filter to
convert the bitstream to an analog signal. It then performs a low-pass filter to yield
the desired voltage levels. The reconstruction filter produces two differential
voltage outputs and a midpoint reference:
• Positive (voltage level representing the output signal)
• Negative (complement of the positive output signal voltage level)
• Midpoint (offset voltage level representing the midpoint of the output voltage
range)
The differential outputs from the reconstruction filter are amplified by analog
amplifiers to provide
the required 2 volts peak-to-peak voltage swing into a 1kΩ load.
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