Later on we will explain why we increased this supply voltage to +5.2 V (still within recommended operating range!). +3.3 V for the digital part and +5 V for the analog part. The PCM1794A (IC1) requires two different power supply voltages. It is a 24 bit DAC, can handle sample rates up to 200 kHz and has a built-in 8x oversampling filter. We had good experiences with DACs made by Burr Brown and so the choice was easy to use one of their top models, the PCM1794A. ICs from Burr Brown (now Texas Instruments) were and still are among the best. In the past we designed High End DACs for normal use. But since we want to build de audio player ourselves, we designed an audio DAC for the raspberry pi using first class parts. DACs with good quality are already on the market. A good start is to look for applications that use a raspberry pi. If space and mobility is an issue these are not suitable. The one’s with network support have no touch screen or are very expensive. Searching for a small stand-alone networked audio player with a touch screen mostly big consumer amplifiers are found. Using app Volumio it can be used as a stand alone networked Audio Player or operated thru a WebUI. This is an Audio DAC designed for the Raspberry Pi.
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