The PD63315 is an audio codec compliant with the AC'97 Rev 2.1 specification. It features 18-bit ADC's and DAC's (2 channels each) for mutual conversion between audio analog signals with a maximum signal band of 20 kHz and digital signals, and supports full-duplex communication. The analog signal input block has four analog stereo signal input lines, LINE, CD, VIDEO, and AUX, and three analog monaural signal input lines, PHONE, PC_BEEP, and MIC (2 MIC pins selectable). The analog signal output block has three outputs pins, LINE_OUT, LNLVL_OUT, and MONO_OUT, each with its own volume control.