The first IC, PCM2706, serves as a bridge between the USB interface and the DAC itself. The computer will recognize it.

According to the datasheet, the PCM5102 features a -2VRMS DirectPath™ output, a 112dB stereo audio DAC, and supports a 32-bit, 384kHz PCM interface.

Four voltage regulators provide 3.3V power to minimize parasitic noise.

The FLT switch controls FIR interpolation filters (“Normal x8/x4/x2/x1”) and IIR interpolation filters (“Low Latency x8/x4/x2/x1”) and is set to the ON position.

Operational amplifiers used: OPA1622.

For measuring amplifier linearity (THD), a methodology is used to determine distortions based on the second harmonic. The second harmonic deviates from the fundamental frequency by 120dB.