6. The Pi-DAC PRO
The Pi-DAC PRO is a HAT compliant add-on accessory for the Raspberry Pi.
The Pi-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 Pi-DAC PRO can be connected to the Raspberry Pi A+/B+/RPi2/RPi3 or PRi4’s 40way pin
header without any additional soldering. The Pi-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 Pi-DAC PRO.
Power LED
Raspberry Pi GPIO Header
HAT EEPROM Write Enable
Headphone socket
XLR / Differential out (LEFT and RIGHT)
Phono (RCA) Output
The Pi-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 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 Pi in parallel
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24-Nov-2019
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