Texas Instruments PCM9211 216kHz and Cirrus Logic CS8422 192kHz S/PDIF transceiver chips for the I/O of S/PDIF
Common scenario will be to use the I2S in directly from RPI and outputs to S/PDIF, be it coaxial or Toslink
The I2S output in HDMI jack also can be tapped as I2S out to another DAC if one fancies
By getting the power from the GPIO pins, it can work independently by itself effectively working as a S/PDIF to I2S converter
Connecting a S/PDIF coaxial input from a CD transport, and gets I2S output from the HDMI jack or another S/PDIF Toslink output
Inputting external I2S signals is also possible through the side pins as long as the pin outs for the I2S connections are correct
Ease of controlling the various I/O is made through the 3 buttons below the tiny but perfectly legible OLED screen
The possibility and versatility of this hat not being used just on the RPI itself is a highly valuable performing addition to many hifi users who love tinkering
Powered by Raspberry internal GPIO pins
Sit directly on top of Raspberry Pi for a small and compact footprint