Microchip Technology Audio Digital-to-Analog Converter Manuel d'utilisateur télécharger pdf (Page 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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Microchip Technology Audio Digital-to-Analog Converter Manuel d'utilisateur Page 21