Power Pins

• VIN - this is the power pin. It can be powered with 3.3 to 5VDC, however, the data lines are 3.3V logic only.
• 3V - this is the 3.3V output from the onboard regulator
• GND - common ground for power and logic

I2S Pins

• WSEL (Word Select or Left/Right Clock) - this is the pin that tells the DAC when the data is for the left channel and when it's for the right channel.
• DIN (Data In) - This is the pin that has the actual data coming in, both left and right data are sent on this pin, the WSEL pin indicates when left or right is being transmitted.
• BCK (Bit Clock) - This is the pin that tells the amplifier when to read data on the data pin.
• MCK (Main clock, optional) - This pin is optional for the PCM510x because it will auto-generate the main clock internally from BCK.

Audio Output

The audio output from this breakout is line-level. It is not AC-coupled because it is centered on ground. You can plug it into anything that is either AC coupled or has the same ground reference.

• Lout - This is the left channel audio output
• Rout - This is the right channel audio output
• G - This is a clean analog ground signal for the audio output
• 3.5mm output jack - This is the onboard output audio jack. Note that it cannot drive headphones - the output is for no less than 1K ohm loads!

Control Pins

• DE - This is the de-emphasis pin for 44.1khz audio. By default it is off.
• FIL - This is the filter pin. You can change the filter from normal to low-latency by pulling the pin high.
• MU - This is the mute pin. You can pull this pin low to set the outputs to ground.
• FM - This is the format pin. You can change the format from I2S to Left justified by pulling the pin high.