Raspberry pi +HIFI DAC+Sound card I2C interface

This HiFi DAC + expansion board is designed on the base of the old version B DAC expansion board. The new version has upgraded to higher-end chips and circuits, and added more practical functions, it has higher performance. Thus, it is highly recommended!

Note: The headphone interface is mainly purposed to connect to an external amplifier. Although we have tested and proved that this board can drive most low internal resistance headphone, and a lot of overseas fans use it to directly drive headphones, there is no official data referring it can directly drive headphones. Please note！

Features

• 1. Upgraded DAC chip, high end PCM5122 chip, I2S interface, supports volume and auto parameters adjusted through I2C interface; supports 16 to 32 bit audio data format; supports 384kHz high sampling rate, 112dB dynamic range, distortion -93Db. Soft up or down ramp and analog mute for 120dB mute SNR.
• 2. PCM5122 integrates negative charge pump, no DC blocking capacitors required; 2.1Vrms with ground center output; greatly suppress band noise. Support loading as low as 1K, PCM510xA can drive multiple paralleled devices(multiple amplifiers work at the same time).
• 3. Output ports has gold plated RCV dual terminal and gold-plated 3.5mm Headset seat.
• 4. Isolated power supply design, independent power supply for raspberry pi and DAC; Ferrite bead has common ground, which avoids current sound.
• 5. Welding free, just plug onto the Raspberry Pi and play; I2S interface directly decode digital to analog.
• 6. Double color LED indicates device status, red is for DAC power indicator (normal power: ON), green is to show DAC working status(working: ON, Stop: OFF).
• 7 Perfectly fits official PI HAT size, gold plating process for PCB board, arc wiring, better guarantee impedance continuity of the signal, reduce signal reflection and refraction.