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6. DAC PRO

The DAC PRO is a HAT compliant add-on accessory for the Raspberry Pi.

The DAC PRO users the Texas Instruments PCM5242 to deliver outstanding Signal to Noise Ration

and supports Balanced / Differential out in parallel to Phono / RCA line level output. It also includes a

dedicated headphone amplifier.

The DAC PRO can be connected to the Raspberry Pi A+/B+/RPi2/RPi3 or

PRi4’s 40way pin header

without any additional soldering. The DAC PRO is powered by the Raspberry Pi.

Component selection and track layout have been in the forefront of our design to ensure noise

immunity and best possible audio playback with the DAC PRO.

Power LED

Raspberry Pi GPIO Header

HAT EEPROM Write Enable

Headphone socket

XLR / Differential out (LEFT and RIGHT)

Phono (RCA) Output

The DAC PRO exposes two 3 pin headers (P7/P9) used by the optional XLR board to provide

Differential / Balanced output exposed by XLR sockets above the Raspberry

Pi’s USB/Ethernet ports.

P1: Analogue out (0..2VRMS), carries GPIO27, MUTE signal (headphone detect), Left and Right

Audio and Left and Right Ground.

P6: Headphone socket signals (pin1: LEFT, 2:GROUND, 3: RIGHT, 4:GROUND, 5:DETECT)

P7/9: Differential (0..4VRMS) output (P7:LEFT, P9: RIGHT)

P10: Alternative 5v input, powering the Raspberry Pi in parallel