Product Description

DAC Audio Decoder Board for Raspberry Pi 3B+/4B

The board employs four professional chips. Two groups of LDO are designed to power analog and digital circuits separately. Solid capacitors with large capacity and tantalum capacitors are used for filtering and decoupling to ensure a stable and clean power supply and effectively improve the overall SNR (signal to noise ratio).

Onboard OLED Display, the standby interface can display the current track sampling rate, the current decoder board input signal format, I2S interface output format, etc, more intuitive and more convenient to use.

On the standby or Settings interface, long-press the mode key to enter the following three Settings interfaces successively. On the Settings screen, short-press the mode key to switch select setting item. The selected setting item will blink, at the time press the up or down key to set parameters.

IN: I2S/DSD/SPDIF. Select DAC decoder board 12S, DSD, coaxial three input sources

I2S: 3-L/4-L. Set 3-wire I2S (no MCLK) or 4-wire I2S (with MCLK), Raspberry Pi 2B/3B/3B+ needs to be set to 3-L; Raspberry Pi 4B can be set to 3-L or 4-L(requires MCLK main clock)

MCLK: aut/128/256/512. When the I2S is set to 3-L, set the multiple relationship between the recovery system master clock (MCLK) and sampling rate FS. aut is automatic multiple mode, 256FS for 192K below, 128FS for 192K above.

BIT: 16R/24B/24R/24L/32B. When IN is set to I2S, set the bit depth of I2S input/output, L/R stands for left-justified/right-justified format, and B is standard I2S format. (Note that the input and output formats of I2S are the same)

     1B When the IN is set to DSD, the bit depth of DSD is 1B and cannot be changed

     16R/24B/24R/24L When IN is set to SPDIF, set the bit depth and format of I2S output

FLT: 1/2/3/4/5. Set the filter type used internally by the PCM5122DAC decoder chip to switch between different tones

SPDF: out/off. Enable or disable the coaxial output function

RCA: out/off. Enable or disable the analog audio output function

OPT: out/off. Enable or disable the optical fiber output function

I2S: out/off. Enable or disable the I2S or DSD output function of HDMI

Notes:

1.The coaxial interface can be set to either output or input by pressing buttons. You can only choose one.

2.I2S and DSD signals are input from the pins on the Raspberry Pi motherboard. The I2S or DSD signals output by HDMI interface are synchronized with the ones output by Raspberry Pi. PCM9211 chip will de-jitter the DSD clock.


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